24 results about "Acetylene hydrogenation" patented technology

The invention discloses a nano silicon dioxide loaded ruthenium-copper bimetallic catalyst as well as preparation and application thereof, and belongs to the technical field of acetylene hydrogenation reaction catalysts. A strong electrostatic adsorption method is adopted, nano silicon dioxide is used as a carrier, the pH of a solution is higher than the isoelectric point of the carrier through adjustment of ammonia water, and the carrier is negatively charged; in ammonia water, Cu and Ru respectively form positively charged metal complexes, and metals are anchored on the surface of the carrier under the action of strong electrostatic adsorption to prepare the atomic-scale dispersed ruthenium-copper bimetallic catalyst for acetylene selective hydrogenation reaction. When the prepared catalyst is used for catalyzing an acetylene hydrogenation reaction and the reaction temperature exceeds 170 DEG C, the acetylene conversion rate can reach 100%, and the ethylene selectivity is 90%-100%. And the catalyst has excellent stability, and can keep activity for a long time without obvious deactivation phenomenon.

The invention provides a metal element doped zinc-aluminum spinel catalyst as well as a preparation method and application thereof. Lattice sites on the surface of the zinc-aluminum spinel are accurately anchored by metal elements in a monatomic form, a lattice atom substitution or gap doping strategy is realized, and the technical problem of preparation of the metal element doped zinc-aluminum spinel in the prior art is mainly solved. The preparation method of the metal element doped zinc-aluminum spinel comprises the following steps: dissolving a zinc source, an aluminum source, a metal M (Ni / Cu / Pt / Pd) precursor and a precipitator in water, stirring and mixing, carrying out hydrothermal treatment, separating solids, filtering, drying, and calcining to obtain the metal element doped zinc-aluminum spinel catalyst (M-ZnAl2O4). Wherein the nickel metal element is doped with the zinc-aluminum spinel catalyst, so that larger nickel particles are more favorably formed, the particle size distribution is uniform, and the catalytic activity and the stability are greatly improved in the reaction of preparing ethylene through acetylene hydrogenation; the copper-nickel metal element doped zinc-aluminum spinel catalyst also shows good catalytic activity and stability in a methanol reforming hydrogen production reaction.

The invention relates to a green catalysis method for improving phenylacetylene hydrogenation selectivity and a catalyst preparation method. The method mainly solves the problems of high catalyst cost, difficult realization of large-scale commercialization and the like caused by large usage amount of noble metals in alkene preparation through alkyne selective hydrogenation at present. According to the green catalysis method for improving phenylacetylene hydrogenation selectivity and the catalyst preparation method, preparation is simple, the usage amount of precious metal is low, H2Ti3O7 intrinsic ion exchange performance is utilized, a Pd active phase is inserted into crystal lattices of the catalyst, continuous active sites are separated, styrene excessive hydrogenation reaction is inhibited, and the selectivity of the catalyst is improved.

The invention provides a preparation method of a high-selectivity semi-hydrogenation MOF (Metal Organic Framework) supported palladium catalyst for catalyzing acetylene. According to the invention, 2-methylimidazole is used as a ligand, Zn < 2 + > is used as a metal node, water is used as a solvent, and a ZIF-8-dia carrier is synthesized at room temperature by controlling the molar ratio of Zn < 2 + > to 2-methylimidazole; and depositing Pd < 2 + > on the ZIF-8-dia carrier by using a reducing agent to synthesize the MOF supported palladium catalyst. Strong electron interaction is formed between Pd nano-particles and a carrier loaded in the MOF loaded palladium catalyst, a rich Pd-N structure is constructed on the interface of the Pd nano-particles and the carrier, formation of Pd0 species is inhibited, the hydrogen activation capacity of the Pd nano-particles is reduced, excessive hydrogenation of acetylene is inhibited, and therefore the selectivity of ethylene is improved; the catalyst shows excellent catalytic performance in acetylene hydrogenation reaction, at 160 DEG C, the acetylene conversion rate reaches 100%, the ethylene selectivity is 85%, and the catalyst has excellent durability and stability.

The present invention discloses the preparation and application of a supported metal phthalocyanine compound electrode for electrocatalytic selective hydrogenation of acetylene. The preparation method of the electrode is carried out according to the following steps: (1) Under ultrasonic conditions, the metal phthalocyanine compound and the carrier are respectively dispersed in DMF, and then the metal phthalocyanine compound solution and the carrier solution are mixed and stirred, treated with plasma, filtered, washed and dried after the treatment is completed, and the obtained catalyst and nafion solution are poured into an organic solvent and ultrasonically treated to obtain a slurry; (2) The cut electrode material is washed; (3) The slurry is evenly coated on the electrode material and irradiated with an infrared lamp until the solution is completely dried to obtain a supported metal phthalocyanine compound electrode. The present invention also provides a method for electrocatalytic selective hydrogenation of acetylene based on this electrode, which can realize the acetylene hydrogenation reaction with high activity, high selectivity and high stability under mild room temperature conditions.

The application provides a MgAlCe-LDH supported Pd-CeO2 composite catalyst, a preparation method thereof and an acetylene hydrogenation method. The composite catalyst comprises a core component, a promoter and a carrier; the core component is loaded on the carrier, and the promoter is grown on the surface of the carrier; the core component is Pd, the promoter is CeO2, and the carrier is a MgAlCe-LDH carrier; in the carrier, the doping mole percentage of Ce is 2.5-10.0 mol%; the loading amount of Pd is 0.06-0.20 wt% and the loading amount of CeO2 is 0.8-4.0 wt% based on 100 wt% of the total mass of the dry base of the composite catalyst. The application further provides a preparation method of the above catalyst and an acetylene hydrogenation method based on the catalyst. The catalyst can catalytically reduce acetylene to generate ethylene with high conversion rate and high selectivity.

This invention discloses a control method, electronic equipment, storage medium, and a method for acetylene hydrogenation to ethylene production from a three-stage C2 hydrogenation reactor. The control method includes: controlling the inlet temperature of the first-stage C2 hydrogenation reactor based on the volume fraction of the product emanating from the first-stage reactor; controlling the inlet temperature of the second-stage C2 hydrogenation reactor based on the volume fraction of the product emanating from the second-stage reactor; and controlling the inlet temperature of the third-stage C2 hydrogenation reactor based on the volume fraction of the product emanating from the third-stage reactor. This invention solves the problem of ethylene loss due to over-hydrogenation in three-stage pre-hydrogenation C2 hydrogenation reactors, increasing the stability of ethylene production, lowering the reaction temperature compared to traditional methods, reducing the risk of temperature runaway, improving the selectivity and operational stability of the C2 hydrogenation reactor, and simultaneously reducing steam consumption by lowering the reaction temperature.

The application discloses a kind of ultra-high load copper monatomic catalyst and its preparation method and ethyne semi-hydrogenation application, nitrogen-containing precursor is calcined, and polymeric carbon nitride is obtained;Polymeric carbon nitride is added to the ethanol dispersion of copper precursor, and ultrasonic is obtained, and mixed liquid is evaporated, and powder is obtained;The powder is calcined under vacuum, and high load supported copper monatomic catalyst is obtained.The copper monatomic catalyst prepared by the application is used for electrocatalytic acetylene reduction reaction, and the catalyst of optimal material load component can be high selectivity catalysis C2H2→C2H4 (the highest can reach C2H4 Faraday efficiency >98%), and atomic dispersion metal site inhibits carbon-carbon coupling in reaction, and the Faraday efficiency of butadiene can be reduced to below 0.5% in the test full current range, and the catalyst shows excellent catalytic activity and stability in electrocatalytic acetylene hydrogenation reaction.

Improved photocatalysis is provided for chemical reactions involving hydrogen in two component plasmon-catalyst nanoparticles. The main idea of this work is to configure the optical illumination of the nano-articles to suppress formation of an undesirable hydride phase in the nanoparticles. This idea is broadly applicable to any chemical reaction involving hydrogen. Specific examples considered experimentally in this work are acetylene hydrogenation to produce ethylene, carbon dioxide reduction and ammonia synthesis.

The invention relates to the field of electrochemical acetylene reduction, in particular to a preparation method and application of a cadmium-modified copper-based electrocatalyst. The catalyst comprises a zirconium hydroxide carrier; the copper-cadmium heterostructure is loaded on the zirconium hydroxide carrier and is formed by a cadmium-modified copper simple substance. The electrocatalyst is applied to electrochemical acetylene reduction to generate ethylene, not only has high activity on acetylene hydrogenation to ethylene, but also has an excellent effect of inhibiting acetylene carbon-carbon coupling, inhibits the Faraday efficiency of a C4 product to 0.06% under a relative reversible hydrogen electrode-0.5 V in acetylene gas flow with a volume fraction of 5%, and has a good application prospect. The Faraday efficiency of the main product ethylene reaches 98.38%, and 99.99% of ethylene selectivity is realized in ethylene-rich gas flow containing trace acetylene. Compared with other copper-based electrochemical acetylene reduction catalysts, the copper-based electrochemical acetylene reduction catalyst has a maximum inhibition effect on a carbon-carbon coupling side reaction, realizes high Faraday efficiency and selectivity of ethylene, and can inhibit generation of ethane and hydrogen at the same time.

The application provides a PDA modified MgAl-LDH supported Pd-based catalyst, a preparation method thereof and an acetylene hydrogenation method. The preparation method comprises the following steps: mixing a MgAl-LDH dispersion liquid and a first modifier solution to obtain a modified carrier; mixing and reacting the modified carrier solution and a Pd precursor solution, and performing centrifugal separation and drying to obtain the PDA modified MgAl-LDH supported Pd-based catalyst; and the first modifier is selected from dopamine hydrochloride. The application also provides the PDA modified MgAl-LDH supported Pd-based catalyst prepared by the above method and an acetylene hydrogenation method based on the catalyst. The PDA modified MgAl-LDH supported Pd-based material is used as the catalyst in the application, the modified carrier significantly enhances the interaction between the active component and the carrier, and the catalyst performance is obviously improved.

The application relates to the field of hydrogenation catalysts, and discloses a silicon carrier, a preparation method of the silicon carrier, an acetylene hydrogenation catalyst and a preparation method of the acetylene hydrogenation catalyst. The preparation method of the silicon carrier comprises the following steps: 1) mixing and stirring a first silicon ester, a second silicon ester and hydrochloric acid in the presence of water until a gelatinous product is obtained; and 2) aging the gelatinous product obtained in the step 1), wherein the first silicon ester is selected from one or more of the following: aminoethylaminopropyltriethoxysilane, aminomethylaminopropyltriethoxysilane, aminoethylaminomethyltriethoxysilane and aminoethylaminopropyltrimethoxysilane. The carrier does not need to be calcined in the preparation process, the preparation method is simple and easy to implement, the acetylene hydrogenation catalyst prepared from the carrier can realize complete conversion of acetylene at a lower temperature, and the acetylene hydrogenation catalyst has excellent acetylene selectivity.

A system for producing hydrogen is disclosed which comprises an acetylene hydrogenation unit configured to receive a compressed cracked gas and produce a purified, compressed cracked gas; a chilling t

The invention relates to a process for producing olefins from a feed stream containing hydrocarbons by pyrolytic cracking of the hydrocarbons in an autothermal reactor, said process comprising: pre-heating an oxygen containing stream and a hydrogen and / or methane containing stream outside the autothermal reactor; feeding the pre-heated oxygen containing stream and the pre-heated hydrogen and / or methane containing stream into a burner of the autothermal reactor; generating steam in a combustion zone of the autothermal reactor; pre- heating a feed stream containing hydrocarbons outside the autothermal reactor; feeding the pre-heated feed stream containing hydrocarbons into the autothermal reactor; mixing the steam generated in the combustion zone with the pre- heated feed stream containing hydrocarbons in a mixing and cracking zone of the autothermal reactor, by feeding the steam and the pre-heated feed stream containing hydrocarbons into the mixing and cracking zone from substantially opposite directions, and pyrolytically cracking the hydrocarbons to provide an effluent containing olefins wherein the olefins comprise ethylene and acetylene; subjecting at least a part of the effluent containing olefins to hydrogenation of acetylene in the gas phase in the presence of a heterogeneous catalyst at a temperature of at least 200 °C, thereby obtaining an ethylene-enriched stream and heat.

A system for hydrogenation C3 and C4 acetylenes contained within a hydrocarbon stream generated in a stream cracker unit where a debutanizer is placed upstream of a depropanizer for more economical processing of the hydrocarbon stream to produce lighter hydrocarbons, where the system requires only one stripper tower downstream of hydrogenation to remove residual hydrogen.

This invention discloses a CuO catalyst supported on a composite Hf-containing support material, its preparation, and its application in the hydrogenation reaction of acetylene. The preparation method of the CuO catalyst supported on the composite Hf-containing support material includes the following steps: preparing a composite Hf-containing support material; loading Cu(OH)₂ onto the composite Hf-containing support material using a wet impregnation process; and then calcining under air atmosphere to obtain the CuO catalyst supported on the composite Hf-containing support material. This invention provides the application of the CuO catalyst supported on the composite Hf-containing support material in the selective hydrogenation reaction of acetylene, exhibiting good stability and high activity.

The invention relates to the technical field of selective hydrogenation purification of olefin gas, and discloses a carbon carrier, a catalyst, a preparation method of the catalyst and a selective hydrogenation purification method. The preparation method of the carbon carrier comprises the following steps: mixing artificial synthetic resin and a solvent into a group, forming and granulating, and sequentially curing, carbonizing and activating particles to obtain the carbon carrier, the activation condition comprises the step of activating the carbonized particles for 1-10 hours at the temperature of 600-1000 DEG C under the condition that the flow rate of water vapor is 0.01-0.2 g / min in a protective atmosphere. The catalyst prepared from the carbon carrier not only has relatively high strength, specific surface area, pore volume and other physical properties, but also can be directly used for acetylene hydrogenation purification in a front-end deethanization front-end hydrogenation process, and the selectivity of ethylene is improved on the basis of relatively high acetylene conversion rate.

The invention discloses a preparation method of a ZIF-8 coated supported palladium catalyst and application thereof in a selective hydrogenation reaction of acetylene. The catalyst consists of a carrier, an active component loaded on the carrier and a film selectively coating the active component, wherein the active component is metal palladium, the carrier is α-Al2O3, the film selectively coating Pd / Al2O3 is a zeolite imidazole framework ZIF-8, the regular pore structure of ZIF-8 separates Pd active sites with a molecular-level grid framework, and can significantly improve ethylene selectivity; the molecular-level network does not cover the active sites, and substantially maintains a hydrogenation activity equivalent to that of Pd / Al2O3, and can simultaneously take into account acetylene hydrogenation activity and ethylene selectivity in the selective hydrogenation reaction of acetylene. The preparation method of the invention is simple, easy to operate, and is conducive to industrial large-scale production.

The invention discloses an acetylene circulating solution catalytic hydrogenation process which mainly comprises the following steps: heating an acetylene circulating solution to a reaction temperature, carrying out two-stage hydrogenation reaction, completely hydrogenating higher alkyne such as butadiyne in a solvent into alkane, carrying out flash evaporation removal on the alkane, and sending the alkane to an acetylene cracking unit by a blower to serve as a cracking reaction raw material, the hydrogenated solvent is subjected to steam stripping dehydration through acetylene-rich gas from a vacuum degassing tower and then is sent to a pre-absorption tower circulation and solvent regeneration unit, and acetylene is recovered before steam stripping gas is sent to a cracking gas compressor. According to the catalyst and the technical scheme adopted by the invention, 99% of higher alkyne in an acetylene circulating solution is removed, and the problem of blockage of the higher alkyne in an acetylene device is solved; high-grade acetylene hydrogenation products and acetylene-rich gas are recycled, so that the acetylene yield of the device is improved, and the acetylene loss is reduced.

The invention provides a method for preparing ethylene through acetylene hydrogenation. The method comprises the following steps: acetylene is subjected to selective hydrogenation by using a supported transition metal phosphide as a catalyst to obtain ethylene, and the supported transition metal phosphide comprises a carrier and a transition metal phosphide supported on the carrier. The transition metal phosphide catalyst which is uniform in active component particle, concentrated in size distribution and simple in preparation process is applied to a reaction for preparing ethylene through acetylene hydrogenation, and has high acetylene conversion activity, high ethylene selectivity and relatively good repeated use stability.

The application provides an alloy catalyst and a preparation method and application thereof, and relates to the field of catalysis technology.The alloy catalyst provided by the application comprises a nitride base and alloy nanoparticles dispersed on the nitride base; the alloy nanoparticles are formed by an active component and an active assistant component; the active component comprises one or more of Pd, Pt, Ni, Rh, Ru and In; and the active assistant component comprises one or more of Ti, Fe, Co, Cu, Zn, Bi, Ga, Mo and Sn. The application utilizes the nitride as the base to inhibit overflow diffusion of active hydrogen on the surface of the alloy nanoparticles, to improve the local hydrogen species density of the active component, so that the catalyst has excellent selectivity and activity in the acetylene hydrogenation reaction, and is beneficial to the purification of ethylene gas prepared by cracking of pure oil.

The utility model relates to the field of chemical production equipment, and discloses an internal leakage prevention pressurizing line which comprises a pressurizing pipeline body and a self-adaptive pressure balance valve fixedly connected to the outer surface of the rear end of the pressurizing pipeline body, and the outer surface of the left side of the pressurizing pipeline body is fixedly connected with a second pressurizing pipe. The outer surface of the left side of the second pressurizing pipe is fixedly connected with a flow control valve. The internal leakage prevention pressurizing line comprises a pressurizing pipeline, a multi-channel parallel pressurizing device and a self-adaptive pressure balance valve, the pressurizing pipeline is connected with an outlet of a C2 vaporizer and an inlet of an acetylene hydrogenation reactor and used for introducing mixed C2 into the reactor for pressurizing, and the multi-channel parallel pressurizing device is connected with the self-adaptive pressure balance valve. The multi-channel parallel pressurizing device is arranged on a pressurizing pipeline and comprises a plurality of pressurizing channels connected in parallel, each channel is provided with an independent flow control valve and a pressure monitoring point, the pressurizing flow and pressure of each channel can be adjusted according to needs, and uniform distribution of pressure in the reactor is achieved.

The invention belongs to the field of catalysts, and particularly relates to a catalyst which comprises a fullerene carrier and an active component loaded on the fullerene carrier, and the active component is selected from one or more of palladium and salts thereof; and the dispersity of the active component is 30%-40%. The invention also relates to a preparation method of the catalyst and an application of the catalyst in catalytic acetylene hydrogenation. The active component of the catalyst is high in dispersity, the mole ratio of zero-valent palladium in the active component is high, and the Dv50 particle size is small; the catalyst is high in raw material conversion rate of acetylene hydrogenation, high in ethylene selectivity, good in stability and long in service life.

The application provides a MgAl-LDH supported PdAg bimetallic catalyst, a preparation method of the catalyst and an acetylene hydrogenation method. The MgAl-LDH supported PdAg bimetallic catalyst contains, with the total dry base mass of the MgAl-LDH supported PdAg bimetallic catalyst being 100 wt%, 0.02-0.08% of a core component, 0.09-0.3% of an auxiliary agent and 99.50-99.95% of a carrier; the core component and the auxiliary agent are loaded on the carrier; the carrier is a magnesium-aluminum hydrotalcite, the core component is Pd, and the auxiliary agent is Ag. The application further provides a preparation method of the catalyst and an acetylene hydrogenation method based on the catalyst. The catalyst can catalytically reduce acetylene to ethylene with high conversion rate and high selectivity.