88 results about "Catalyst poisoning" patented technology

The invention relates to the field of high polymer materials, and discloses a preparation method of high-temperature-resistant oil-resistant special functional silica gel, which comprises the following steps: adding a thermoplastic polyester elastomer, fluorosilicone rubber and a macromolecular compatilizer into an extruder through a main feeding port, and carrying out melt blending; adding hydrogen-containing silicone oil, a platinum catalyst and an internal closed type cross-linking agent through a side feeding port, and carrying out distributed blending; under the condition that the temperature is higher than the deblocking temperature of the cross-linking agent, initiating the internal closed cross-linking agent to perform physical thermal cracking shelling and release cross-linking sites, and guiding hydrosilylation reaction to perform dynamic vulcanization; and after vacuumizing and exhausting, extruding and pelletizing to obtain the silica gel. Through cooperation of a space-time decoupling distributed feeding process and a non-toxic thermal deblocking cross-linking agent, catalyst poisoning caused by early-stage high-temperature shear consumption and by-products is avoided, a cross-phase covalent interlocking network is constructed at a polyester and fluorine-silicon two-phase interface, permeation of a non-polar solvent is hindered, and therefore the performance of the fluorine-silicon copolymer is improved. The volume swelling ratio of the material is reduced; and the high-temperature aging resistance is improved.

The invention discloses a mixed waste plastic recovery and conversion reaction system which comprises a waste plastic raw material bin, a spiral feeder, a reaction furnace, a combustion chamber, a condensing device and an oil storage tank. The reaction furnace is sequentially provided with a feeding end, a reaction area and a discharging end, the reaction area comprises a plurality of reaction sections which are connected in series, the reaction sections are sequentially and continuously arranged along the length of a furnace body, and each reaction section is provided with a temperature control device which is independently opened and closed; the discharging end is communicated with a condensing device, and the condensing device is provided with a condensed kerosene outlet and a non-condensed pyrolysis gas outlet; the non-condensing pyrolysis gas outlet is divided into two paths, one path is communicated with the reaction furnace, and the other path is communicated with the combustion chamber. According to the invention, multiple reaction sections are combined and connected in series, multiple reaction mode combinations are provided, and high-value aviation kerosene can be produced. According to the invention, dechlorination can be effectively carried out before pyrolysis, and equipment corrosion, catalyst poisoning, secondary pollution and the like are prevented; according to the invention, the non-condensed gas is recovered for hydrogenation upgrading of products and self-heating of the system, so that energy is saved.

The invention discloses a flue gas treatment device based on a noble metal catalyst, and relates to the technical field of flue gas treatment. An inner mounting frame is fixedly mounted on the inner surface wall of the treatment box, an annular outer frame is fixedly mounted on one side of the outer wall of the inner mounting frame, and a rotating groove is pre-formed in the annular outer frame. Through a multi-stage collaborative filtering mechanism, a clean reaction environment is provided for a noble metal catalyst: a linkage frame drives a filter plate to rotate, and large-particle impurities, sulfur oxides and chlorides are intercepted by utilizing centrifugal force and a composite filter material (a stainless steel filter screen and activated carbon); the guide vanes form spiral airflow, and fine impurities with the particle size larger than or equal to 1 micron are separated through centrifugal force; the metal filter pipe is combined with dynamic negative pressure adsorption, deep removal of residual dust and three-stage filtration, so that the impurity content in flue gas can be greatly reduced, catalyst poisoning, blockage or sintering are avoided, the service life of the catalyst is prolonged, and the replacement cost of precious metal is greatly reduced.

The invention relates to the technical field of air pollution control, in particular to an air pollution denitration and desulfurization tail gas purification method which comprises the following steps: rotational flow spray desulfurization (adopting nanoscale composite absorbent slurry to efficiently absorb SO2 and remove particulate matters in a rotational flow reactor), two-stage catalytic denitration (using a nano-catalyst to promote NOx reduction in a low-temperature region, and using a high-temperature catalyst to remove the particulate matters in a low-temperature region). In the high-temperature area, a vanadium-tungsten-titanium-based catalyst is loaded through a novel honeycomb ceramic carrier to strengthen the reaction), deep collaborative purification is carried out (residual pollutants and aerosol are further removed by utilizing electrostatic precipitation and oxidative adsorption coupling), and an intelligent regulation and control system is used for optimizing the ratio of an absorbent, the temperature of the catalyst and flow velocity parameters in real time. According to the method, the problems of catalyst poisoning, high energy consumption and insufficient treatment efficiency in a traditional process are solved through a nano material modified absorbent, a temperature gradient catalytic reaction and a multi-pollutant synergistic removal mechanism. The desulfurization efficiency of the system is greater than or equal to 98%, the denitration efficiency is greater than or equal to 97%, the particulate matter emission is less than or equal to 10mg / m < 3 >, the SO2 is less than or equal to 35mg / m < 3 >, and the NOx is less than or equal to 50mg / m < 3 >

The invention belongs to the technical field of coal ethylene glycol, and particularly relates to a process and a device for finely removing impurities from carbon monoxide after cryogenic separation of synthesis gas, the device comprises an impurity removal device, the impurity removal device comprises a desulfurization tank, a dechlorination tank and a decarbonylation tank which are sequentially connected in series, or an adsorption tower which is sequentially filled with desulfurization, dechlorination and decarbonylation adsorbents; the impurity removal device is arranged to remove trace hydrogen sulfide, hydrogen chloride, carbonyl iron and carbonyl nickel in CO after cryogenic separation, so that ppb-level removal of impurities in CO is realized, poisoning of a downstream dimethyl oxalate (DMO) synthesis catalyst is avoided, the service life of the catalyst is prolonged, the production cost of an enterprise is reduced, and the operation stability of the device is improved.

The invention discloses a helium purification method capable of preventing catalyst poisoning, which comprises the following steps: cooling raw material gas until miscellaneous gas with liquefaction temperature equal to or higher than that of nitrogen in the raw material gas is liquefied, carrying out gas-liquid separation to obtain intermediate product gas containing neon gas, hydrogen gas and helium gas, and adsorbing the neon gas in the intermediate product gas at low temperature to obtain mixed gas, the miscellaneous gas contains nitrogen; hydrogen in the mixed gas is removed through a catalyst, so that a helium product is obtained, and at least one first type of gas capable of poisoning the catalyst exists in the offensive gas. The explosion risk can be eliminated, external gas is not needed, the process is simplified, and safety is improved. The temperature optimization catalytic reaction can improve the hydrogen removal rate and prolong the service life of the catalyst, the extraction of byproducts of high-purity hydrogen and neon can increase the resource utilization rate, and the limitation of the traditional process is broken through.

The invention relates to the technical field of methanol synthesis, and discloses a low-pressure methanol synthesis system capable of protecting a catalyst, which is formed by communicating a raw material gas pretreatment unit, a shell-and-tube fixed bed reactor with a gas-solid coordinated regulation and control assembly, a product separation unit and a tail gas circulating compressor through pipelines, the raw material gas pretreatment unit removes catalyst poisons such as sulfur and chlorine and solid impurities in raw material gas through a desulfurization device, a dechlorination device, an impurity filter and a preheater which are connected in series, catalyst poisoning is avoided from the source, and initial conditions are provided for reaction. The gas-solid coordinated regulation and control assembly can eliminate radial layering of gas, break a product gas film, accelerate product separation and solve the problems of overtemperature of a catalyst and uneven gas-solid contact, the product separation unit purifies crude methanol through cooling, gas-liquid separation and rectification, and the tail gas circulation compressor sends unreacted tail gas back to the reactor, so that the conversion rate of raw materials is increased, and the production cost is reduced. The cost is reduced; and the emission is reduced.

This utility model relates to the field of flue gas purification technology for industrial silicon DC and AC furnaces. To address the problems of unstable denitrification efficiency, inability to remove high-concentration NOx, catalyst poisoning, and a maximum denitrification efficiency of no more than 90% in existing technologies, this utility model provides an industrial silicon smelting flue gas purification system and production line. The system includes a first-stage waste heat boiler, a medium-high temperature SCR denitrification device, three rake soot blowers, three ultrasonic soot blowers, a second-stage waste heat boiler, a filter dust collector, and a wet desulfurization tower. The rake soot blowers remove ash from the surface of the plate catalyst bed. The industrial silicon smelting flue gas purification system and production line provided by this utility model, through the medium-high temperature SCR denitrification device and the introduction of a pre-stage waste heat boiler to regulate the flue gas temperature to the SCR temperature window, combined with the dual ash removal mechanism of rake soot blowers and ultrasonic soot blowers, prevents catalyst poisoning, blockage, and ash adhesion, thereby improving the denitrification efficiency to as high as 95%.

The invention belongs to the technical field of tire oil treatment, and particularly relates to a tire oil hydrofining method. The method comprises the following steps: mixing tire oil with a cosolvent, and preheating and pressurizing together with hydrogen to form a supercritical feed flow; enabling the feed flow to enter a countercurrent moving bed reactor from the bottom, carrying out countercurrent contact reaction on the feed flow and hydrogenation catalyst microspheres added from the top, and simultaneously separating and removing hydrogen sulfide and ammonia generated by the reaction in situ by utilizing a membrane separation assembly positioned at the middle upper part of the reactor; a reaction product is separated to obtain a refined oil product, and the refined oil product is recycled after gas-phase purification; and the deactivated catalyst is regenerated and then returns to the system for recycling. Through the synergistic effect of the supercritical condition, the countercurrent moving bed, the in-situ membrane separation and the special catalyst, the technical problems of easy poisoning and coking of the catalyst, insufficient reaction depth and short operation period in the traditional process are effectively solved, and efficient, stable and deep refining of the tire oil is realized.

The invention discloses an environment-friendly metal deactivator and a preparation method thereof, and relates to the field of petrochemical engineering, and the environment-friendly metal deactivator comprises the following raw materials in parts by weight: 10-15 parts of modified nano magnesium oxide, 10-12 parts of citric acid, 20-25 parts of calcium nitrate and 350-450 parts of water. The modified nano magnesium oxide has strong hydrothermal stability, strong affinity with an FCC catalyst, strong capability of passivating heavy metals nickel and vanadium, effective inhibition of FCC catalyst poisoning, and high environmental protection property.

This invention belongs to the field of polymer materials technology, specifically relating to a production process for ultra-high molecular weight polyethylene (UHMWPE). By optimizing the catalyst system and polymerization process, this invention improves the performance and production stability of UHMWPE. A co-catalyst composed of alkylaluminum and organosiloxane modifiers, acting synergistically with external electron donors, significantly enhances catalyst activity and stereoselectivity, resulting in a more stable polymerization process, higher molecular weight and narrower molecular weight distribution, and significantly enhanced mechanical properties. The multi-stage polymerization process achieves precise control of the polymerization process through segmented temperature control, coupled with a dual-circulation heat removal system to effectively remove reaction heat, avoid localized overheating, and ensure a uniform and stable product structure. An integrated solvent recovery and molecular sieve drying system enables efficient recycling of hexane, controlling moisture content to ≤5ppm, preventing catalyst poisoning, ensuring stable continuous production, and overall improving the process's economy and reliability.

The invention relates to the technical field of rubber, in particular to a high-toughness wear-resistant flame-retardant silicone rubber composite material and a preparation method thereof. According to the composite material, vinyl-terminated polydimethylsiloxane and a vinyl-terminated (diphenyl siloxane)-dimethylsiloxane copolymer are taken as matrixes, and a reactive phosphorus-containing siloxane cross-linking agent is introduced to chemically bond a flame-retardant structure to a cross-linked network; and the hydroxylated boron nitride nanosheet modified by amino / alkenyl silane double paths is cooperated with the para-aramid pulp to construct a multi-dimensional enhancement system. According to the preparation method, through a sequential process of pre-reacting and then curing, catalyst poisoning is effectively avoided, and uniform dispersion and strong interface combination of the filler are ensured. The material has high mechanical strength, excellent wear resistance and lasting flame retardance, and is particularly suitable for sealing elements under the working condition of long-term vibration friction.

An electrode for a fuel cell comprises an electrode binder and an electrode catalyst dispersed therein. The electrode catalyst includes a catalyst complex with a catalytic metal supported on a support and a porous polymer coating layer. The porous polymer enhances performance by forming a core-shell structure on the catalytic metal surface. A method of manufacturing the electrode includes involving preparation of the catalyst complex, coating the catalytic metal with the porous polymer to form an electrode catalyst, combining the catalyst with an electrode binder to prepare a slurry, and applying the slurry onto a substrate. The porous polymer is optionally a polymer of intrinsic microporosity (PIM) or a copolymer, with molecular weight, composition, and thickness optimized for conductivity and performance. The electrode is suitable for use in a membrane-electrode assembly for fuel cells.

The present disclosure describes a method of reducing catalyst poisoning in a diesel engine equipped with an aftertreatment system including a selective catalytic reduction device. The method includes lubricating the engine with a lubricating oil composition. The lubricating oil composition comprises a major amount of an oil of lubricating viscosity; and a calcium salicylate or magnesium salicylate detergent, wherein the lubricating oil composition is free of a calcium sulfonate detergent.

The application discloses a test method and equipment for simulating HCs poisoning of a diesel engine aftertreatment catalyst, and the test method is a simple and efficient catalyst poisoning simulation method, which can simulate poisoning conditions of different catalytic devices / systems in different scenes through a small sample form, close to a vehicle use scene, and provide powerful theoretical support for rapid screening of anti-poisoning formula and analysis of poisoning causes. In addition, the test method can more objectively reflect catalyst poisoning conditions in actual operation of the vehicle, and reasonably evaluate the anti-poisoning capability of the catalyst. The test equipment provided by the application can be used for the test method, and the composition and dosage of toxic substances can be conveniently and quickly adjusted, so that the actual working conditions of the catalyst are more objectively and truly reflected, and a basis is provided for performance evaluation of the catalyst.

The present invention relates to an electrode for a hydrogen evolution reaction in an alkaline water electrolysis cell, wherein the electrode comprises: a co-catalyst consisting of a composite containing a Lewis acid-containing material and a metal-organic framework (MOF); and a catalyst surrounded by the co-catalyst. According to the present invention, the water dissociation step of the alkaline hydrogen evolution reaction is promoted, hydrogen gas generated by the hydrogen evolution reaction can easily permeate through the structure, and Nafion is uniformly dispersed by the large pores created by the MOF, thereby implementing the co-catalyst effect across the entire surface while minimizing catalyst poisoning.

The application provides a coke oven gas purification system, wherein tar in raw coke oven gas is removed through a coking removal device, the raw coke oven gas after coking removal is pressurized by a blower and then sent to a desulfurization device to remove hydrogen sulfide in the raw coke oven gas, the coke oven gas after desulfurization is first dehydrated by a gas-liquid separator and then sequentially subjected to oil removal by an oil removal device and naphthalene removal by a naphthalene removal device to produce purified coke oven gas. The system of the application removes tar, hydrogen sulfide, naphthalene and water in the raw coke oven gas through cooperation of the above devices, realizes purification of the raw coke oven gas, and effectively avoids problems such as equipment corrosion, catalyst poisoning, pipeline blockage, low combustion efficiency and environmental pollution caused by direct utilization of the raw coke oven gas.

The embodiment of the invention provides a high-sulfur petroleum coke coupling green hydrogen methanol preparation system, which comprises a petroleum coke pretreatment device, a petroleum coke gasification device, a carbon hydrogen ratio reforming device and a methanol synthesis device which are connected in sequence, the carbon-hydrogen ratio reforming device is used for reforming the carbon-hydrogen ratio twice and desulfurizing twice; the system comprises an electrolytic hydrogen production device which is used for providing oxygen for a petroleum coke gasification device and providing hydrogen for a hydrocarbon ratio reforming device. Through multiple desulfurization treatment before methanol synthesis, the sulfur content in the gas output by the carbon-hydrogen ratio reforming device can be extremely low, and methanol synthesis is ensured to be performed in a low-sulfur environment, so that sulfur corrosion and catalyst poisoning during high-sulfur petroleum coke gasification are prevented; according to the characteristics of petroleum coke, systematic methanol preparation process integration is formed by combining green hydrogen energy of hydrogen production through water electrolysis, accurate regulation and control of the hydrogen-carbon ratio of synthesis gas are achieved, and energy consumption and carbon emission are reduced.

The invention relates to the technical field of environmental protection equipment, in particular to an SCR (Selective Catalytic Reduction) denitration ammonia spraying device for controlling ammonia escape, which comprises a spray gun mechanism arranged in a flue, and the spray gun mechanism comprises an inner pipe and an outer pipe; the inner space of the inner pipe is divided into a filling cavity formed in the upstream and a mounting cavity formed in the downstream in the fluid flowing direction. A heat tracing cavity covering the filling cavity and the mounting cavity is formed between the outer pipe and the inner pipe and is used for circulating a high-temperature heating medium; a gasification heat absorption core is arranged in the filling cavity, and a valve element and an elastic piece are arranged in the mounting cavity; through the arrangement of the heat tracing cavity and the gasification heat absorption core, a forced heat exchange environment is constructed. It is ensured that sprayed fluid is inevitably in a high-pressure gas state, and the problems of ammonia escape and catalyst poisoning caused by direct spraying of liquid drops under the low-temperature working condition are thoroughly solved.

The application discloses a kind of whole vehicle fuel sulfur content calculation methods, belong to fuel sulfur content calculation technical field.The whole vehicle fuel sulfur content calculation method includes the following steps: S1: information collection;S2: training NARX neural network model;S3: report whether SCR catalyst is sulfur poisoning failure;S4: repair to the poisoning SCR catalyst;If driver uses low sulfur content oil, time is very long, possibly all does not cause catalyst poisoning, so adopt the product of sulfur content and time, to express the degree of poisoning comprehensively, using NARX neural network to calculate: the poisoning degree of engine next time, is influenced by its last time poisoning degree, the feature of NARX neural network is to use the output value of last time, as the input of next time participates in calculation, improves the accuracy of whether catalyst is poisoned detection.

The utility model relates to flue gas denitration technical field especially relates to a kind of stable and efficient biomass boiler's denitration system of efficiency. Including: energy conversion unit, with biomass boiler connection;Heat recovery unit, with biomass boiler connection;Dust desulfurization unit, with heat recovery unit connection;Chimney, with dust desulfurization unit connection;SNCR processing unit, set between heat recovery unit and biomass boiler;Low-temperature denitration unit, set between chimney and dust desulfurization unit, and with energy conversion unit and heat recovery unit are connected;Detection control unit, for detecting the temperature of flue gas generated by biomass boiler and the concentration of NO X Of flue gas in dust desulfurization unit, and according to the temperature and the concentration of NO X Control SNCR processing unit operation and / or low-temperature denitration unit operation.The system greatly reduces the possibility of catalyst poisoning, not only solves the problem of frequent poisoning of catalyst in conventional SCR denitration, but also the way denitration efficiency is high, and the system is stable.

The invention relates to a preparation process of a bifunctional Ru / C catalyst applied to coupling thermocatalytic methanol dehydrogenation and electrocatalytic hydroxidation reaction, belonging to the technical field of methanol hydrogen production. TDI industrial waste residue is used as a raw material, and through the links of pyrolysis activation, supercritical methanol modification, bimetal freezing loading, activation, interface bonding construction, hydrophobic layer coating and the like, the Ru / C catalyst is prepared. The catalyst solves the problems that an existing Ru / C catalyst is sensitive to CO poisoning, easy to sinter at a high temperature, high in component and the like, the Ru utilization rate is high, the activity attenuation is reduced after long-time operation, the components are effectively reduced, and the catalyst is suitable for the process requirements of methanol hydrogen production-synthesis gas co-production.

Improved performance ion exchange membranes for use in PEM, AEM and DMFC fuel cells, buffered fuel cells, hydrolysis, other applications comprise a molecular matrix of homopolymers, di-monomer, heteropolymers, copolymers, or block-polymers of fluorocarbon and hydrocarbon compounds combined with (i) skeletal support grid to improve durability, handling, reduce membrane swelling, and sequester dopants and nanoparticles from leakage; (ii) microporous membrane formed using a sacrificial filler process enhancing conductivity and limiting fuel crossover; (iii) hetero-ionomeric matrix of two-or-more membrane-bound acids e.g. sulphonic and phosphonic acid expanding usable range; (iv) permanent fillers enhancing conductivity and porosity including nanoparticles, metal-oxides, zeolites, silicates, GOs, CNTs, MOFs, POSS, and others; (v) ionic liquid doping to enhance membrane conductivity; (vi) membrane nanocoating preventing H2O2 diffusion; and / or (vii) catalytic nanocoating with metals, metal-oxides, and MOFs preventing atmospheric toxin catalyst poisoning. Combined with a heterogenous GDL, the IEM is integrated into iBFC power blade and energy bank applications.

Currently, due to their inherent flammability, polyurethane reinforcement grouting materials for coal mines typically incorporate halogen-containing flame retardants during their preparation to enhance their flame-retardant properties. However, polyurethane materials containing these flame retardants remain in the finished coal, potentially causing catalyst poisoning in coal chemical production. Furthermore, halogen-containing flame retardants exhibit high smoke production and highly toxic fumes when exposed to open flames, posing a significant risk of injury to personnel. This invention addresses these drawbacks by adding our company's DMMP microcapsules and powder dispersant to the system and adjusting the formulation, thus preparing a halogen-free polyurethane reinforcement material for reinforcing coal and rock masses in coal mines. This material overcomes the aforementioned drawbacks and possesses significant practical application value.

The application provides a preparation method of triphenyl chloromethane and belongs to the technical field of pharmaceutical intermediates. The preparation method comprises the following steps: obtaining a suspension by using pure benzene, a composite catalyst and an adsorbent, then adding carbon tetrachloride drop by drop to obtain a reaction liquid, stirring and treating the reaction liquid with 808 nm laser when the reaction liquid is heated to 60-80 DEG C, and then performing post-treatment to obtain the triphenyl chloromethane. The composite catalyst catalyzes the reaction of pure benzene and carbon tetrachloride to generate triphenyl chloromethane and release hydrogen chloride, and the adsorbent can adsorb hydrogen chloride in situ, thereby preventing acid corrosion and catalyst poisoning while maintaining the forward progress of the reaction. The composite catalyst and the adsorbent realize catalysis-adsorption synergistic promotion of the forward progress of the reaction, thereby reducing the catalyst consumption, shortening the reaction time, reducing the wastewater generation amount, improving the reaction yield and the purity of the triphenyl chloromethane.

The invention relates to the technical field of wastewater treatment, and discloses an electrocatalysis-advanced oxidation coupled chemical high-salt degradation-resistant wastewater treatment device which comprises a potential energy utilization assembly, the potential energy utilization assembly comprises a water tank shell, a rotating roller is installed at the bottom of the water tank shell, and a fan wheel fixedly sleeves the side face of the rotating roller. A driving belt is mounted at one end of the fan wheel, a reaction tank is mounted in the water tank shell, a catalysis cylinder assembly is mounted on the inner side of the reaction tank, a bottom tank shell is fixedly connected to the bottom end of the water tank shell, a crystal screening assembly is mounted on the inner side of the bottom tank shell, and a brush is mounted on the inner side of one end of the bottom tank shell; the reaction tank and the fan wheel convert water flow potential energy into kinetic energy of rotation of the rotating roller, the catalysis cylinder assembly is driven by the transmission belt to rotate and rub out impurities on the surface of a catalyst, and the problem that when the wastewater treatment device is used, heavy metal, halogen or other impurities in wastewater can be adsorbed on active sites of the catalyst, and consequently the catalyst is poisoned and inactivated is solved.

The invention relates to the technical field of industrial chemistry and resource recovery, and discloses a method for efficiently extracting acetophenone and other organic chemical materials from heavy aromatics, the method comprises the steps of raw material pretreatment, catalytic cracking reaction, rectification separation and condensation recovery, and the raw material pretreatment comprises the steps of mechanical filtration, dehydration treatment and preliminary fractionation; solid impurities and moisture in the heavy aromatic hydrocarbon raw material are removed, light components are separated out, pure raw materials are provided for subsequent catalytic cracking reaction, catalyst poisoning and reaction interference are avoided, and the stability and efficiency of the whole extraction process are guaranteed; a composite catalyst is adopted for catalytic cracking reaction, macromolecules in heavy aromatics are efficiently cracked to generate acetophenone, methyl styrene and other organic chemical materials under optimized pressure and temperature conditions, the catalyst has high activity and selectivity, and the yield and reaction rate of a target product are improved.

The invention discloses a process method for preparing glycollic acid by utilizing PET (Polyethylene Terephthalate) waste through a one-pot method. The technological method comprises the following steps: adding alkali liquor, PET waste and a monatomic catalyst into a high-pressure reaction kettle, oxygenating to 1.2-1.5 MPa, heating to a target temperature, reacting, and separating and purifying after the reaction is finished to obtain glycollic acid, wherein the monatomic catalyst is selected from Pd1 / TiO2. According to the method, high-yield and high-selectivity glycollic acid is successfully prepared by using Pd1 / TiO2 as a catalyst and adopting a one-pot method, and the method for catalyzing by using the monatomic catalyst Pd1 / TiO2 has the advantages that the adsorption mode of EG can be accurately limited, a side reaction path caused by multi-point adsorption is avoided, the selective generation of * CHO-CHO * intermediates is ensured, the product selectivity is further improved, and meanwhile, the method is suitable for industrial production. The strong metal-carrier interaction between the TiO2 carrier and Pd monatomic regulates and controls the electronic structure of Pd, weakens the adsorption strength of carbonyl-containing intermediates, relieves catalyst poisoning, accelerates glycollic acid desorption, and further improves the reaction efficiency.

A process is provided for treating a stream comprising light olefins and carbon monoxide by passing the stream through a bed containing a copper-containing material. Removal of carbon monoxide is required to prevent catalyst poisoning in downstream oligomerization reactors. The carbonaceous material converts carbon monoxide and hydrogen to carbon dioxide and water. The olefin stream is then dried and passed to an oligomerization step. Three beds may be present such that these beds may alternate a regeneration step, a reaction step with CO and H2, and an O2 scavenging step.

The invention relates to the technical field of coal tar, in particular to a multi-stage reactor for full-fraction hydrogenation of medium and low temperature coal tar. The new hydrogen treatment mechanism comprises a first outer box fixedly connected to the upper end face of the base, a deoxidation assembly, a convergence funnel, a desulfurization assembly and a drying assembly are sequentially arranged in the first outer box from top to bottom, and a new hydrogen compressor and an output assembly are arranged on the two sides of the first outer box correspondingly; the new hydrogen compressor and the output assembly communicate with the interior of the first outer box. According to the circulating hydrogen treatment mechanism, through a deoxidation assembly, a desulfurization assembly, a drying assembly and an output assembly in the new hydrogen treatment mechanism, pretreatment of deoxidation, desulfurization and drying is sequentially conducted on new hydrogen before the new hydrogen is input into the reactor, and harmful impurities in the hydrogen can be effectively removed; poisoning and inactivation of the catalyst are avoided, side reaction is inhibited, and the reactor and subsequent equipment are protected from corrosion.