34results about How to "Achieve complete oxidation" patented technology

The invention discloses a methanol steam hydrogen production technology by using catalytic combustion flue gas as a heat source, relating to a hydrogen production technology, and aiming to solve the problem that tail gas is discharged but is not utilized to result in resource waste in the traditional methanol steam hydrogen production technology. Methanol and desalted water as raw materials are orderly preheated, gasified, overheated and converted to obtain converted gas; then the converted gas is adsorbed at variable pressure, the product hydrogen is obtained, and tail gas is discharged, wherein the heat quantity is supplied by heat conducting oil in the converting procedure, the tail gas generates the heat quantity through catalytic combustion and conducts the heat quantity to the heat conducting oil in a heat conducting system.

The invention provides a low-load palladium-platinum core-shell structure catalyst. The catalyst is prepared through the following method that a Pd precursor and propylene carbonate are mixed, stirring for reacting is carried out for 1 h to 5 h in the hydrogen atmosphere of 1 MPa to 4 MPa under the room temperature condition, and a solution containing Pd nano particles is obtained; a Pt precursor is added into the obtained solution containing the Pd nano particles, stirring for reacting is carried out for 1 h to 5 h in the hydrogen atmosphere of 1 MPa to 4 MPa under the room temperature condition, and a solution containing core-shell structure active components is obtained; the obtained solution containing the core-shell structure active components and a carrier Al2O3 are mixed, stirring is carried out for 4 h to 48 h, suction filtration is carried out, a filter cake is subjected to vacuum drying, and a finished product is obtained. According to the synthesis method of the catalyst, raw materials are easy to obtain and can be reused, waste gas and waste water are not generated, the environmental cost is low, scaling up can be easily carried out for industrial production, the activity of the prepared catalyst is higher than that of a catalyst obtained according to an existing method, stability is good, and the catalyst can be applied to a methylbenzene catalytic oxidation reaction.

The invention discloses a method for preparing hydrogen with natural gas as a raw material, comprising the following steps: the natural gas enters a desulphurization reactor to be desulfurized after passing through a multichannel heat exchanger; the desulfurized natural gas is mixed with overheated water vapour and then heated by a catalyzing burner before being sent into an adiabatic reactor in which the mixture of the natural gas and the overheated water vapour reacts with the air under the action of catalyst; the gas from the reaction is sent into a CO convertor for CO transformation reaction after undergoing heat transfer in a steam superheater; the gas from the reaction is sent into a membrane separator to be separated to obtain hydrogen and tail gas; the tail gas is sent into the catalyzing burner and goes through catalytic combustion reaction with air in the presence of the catalyst; the high-temperature flue gas generated in the reaction is sent into the multichannel heat exchanger for heat transfer and then heated in a steam generator for desalting water to obtain saturated vapour to be sent into the steam superheater. The invention has the advantages of simple technology, reduced production cost, low energy consumption and no pollution to the environment.

The invention discloses amino wet combined desulfurization and denitration device and a process. The device comprises a desulfurization tower with an inlet flue, a liquid ammonia storage tank, an ozone generator, and a booster fan on the inlet flue; and a defogging layer, a spraying layer and a tower kettle are orderly arranged inside the desulfurization tower from top to bottom. The device also comprises an oxidization slot communicated with the tower kettle, and an oxidization fan connected to the oxidization slot; the liquid ammonia storage tank is communicated to the tower kettle through one path of pipeline, and is communicated to the bottom part of the oxidization slot through another pipeline; the ozone generator is communicated to an air inlet of the booster fan through the pipeline; ozone is sprayed into smoke from the air inlet of the booster fan; nitric oxide in the smoke is oxidized into nitrogen dioxide; the smoke oxidized by ozone is conveyed to the desulfurization tower; liquid ammonia is sprayed to desulfurize and denitrate; the smoke is discharged after being defogged and dried; and circulating liquid by which sulfur dioxide and nitrogen dioxide are absorbed is oxidized outside the tower, and the liquid ammonia is conveyed to the oxidization slot to adjust the pH (Potential Of Hydrogen) value in the oxidization slot during the oxidization process.

Disclosed are preparation of a catalyst of PtMnO2/Co3O4/CeO2 and a catalytic application of the catalyst to low-temperature oxidation of carbon monoxide and formaldehyde. The atomic ratio of Co to Mn to Ce in a composite oxide of MnO2/Co3O4/CeO2 is 38/1/1. The catalyst of PtMnO2/Co3O4/CeO2 related in the invention has preferable catalytic activity and has a conversion rate of CO oxidation of 99% at a relatively low temperature of 196K, wherein the conversion rate can continuously maintain for more than 480 min. Complete oxidation of formaldehyde can be realized at a room temperature.

The invention relates to metal ions adsorbed by bentonite and a regenerating method of the metal ions adsorbed by the bentonite. According to the regenerating method, a good effect is achieved by treating Cu2+, Ni2+ and Co 2+ waste water through the bentonite serving as an adsorbent, after the collected metal ions are subjected to complexation and separation in a two-phase system, the metal ions adsorbed by the bentonite and oleic acid radical ions are subjected to complexation and transferred to an organic phase, the bentonite in a water phase can continue to be used for adsorbing metal ions after being washed centrifugally, the oleic acid-metal coordination compound in the oleic phase is respectively calcinated in the argon environment and the air environment to form nano metal oxide powder with high added-value, and resource utilization of the metal ions is achieved.

The invention discloses an ammonia process desulfurization device capable of saving energy by more than 50%. One part of liquid conveyed out of a low circulating pump is conveyed to a cooling and dry powder discharging integrated pipe, is instantaneously evaporated into dried ammonium sulfate with hot flue gas and can be directly used for farmland fertilizers, so that lots of heat energy of a subsequent drying system is saved, the flue gas can be cooled, and a temperature-resistant range of an anticorrosive layer of a desulfurizing tower is reached; oxidation air upwards penetrates through small pores of a porous flanged gas-liquid plate, and liquid flows back and forth transversely and is repeatedly in contact with the oxidation air, so that the oxidation efficiency is improved; the liquid and air flows through respective channels without conflicting with each other, so that the operation is smooth, and the operating flexibility is greatly improved; due to an energy recovery pipe, high potential energy can be totally utilized, and the impact failure effect on equipment is relieved; the problem that the existing equipment is high in investment, high in power consumption, poor in absorption liquid oxidation effect and difficult to control is wholly solved, the capital of the desulfurizing tower can be theoretically saved by 33% or higher, and the energy and capital of a primary circulating pump of the maximum power consumption equipment can be saved by more than 50%.

The invention discloses a gold-base catalyst for room-temperature carbon monoxide removal and a preparation method thereof. According to the invention, a traditional deposition-coprecipitation method for preparation of the gold-base catalyst is improved; a gold precursor is activated by adopting a light-heat combination mode to prepare a gold catalyst for performing catalytic oxidation on carbon monoxide at room temperature; and the gold utilization rate is improved. The method is simple in process flow, convenient to operate and high in repeatability, the preparation parameters are easily controlled, and the large-scale synthesis can be realized.

The invention relates to preparation for an Au-PtMnO2Co3O4CeO2 catalyst and catalytic application. The catalyst is characterized in that the mass percentages of Au and Pt in the catalyst are 2% and 1% of MnO2Co3O4CeO2, respectively, and the atomic ratio of Co, Mn and Ce in the MnO2Co3O4CeO2 composite oxide is 19/1/1. The moisture resisting property of the Au-PtMnO2Co3O4CeO2 catalyst is improved, the carbon monoxide oxidative activity of the catalyst in a normal temperature moisture environment can be further improved, and the catalyst can be used for completely oxidizing formaldehyde under a room temperature condition.

A waste gas purifying catalyst. The invention belongs to the technical field of waste gas treatment. A preparation method of the catalyst includes: performing wet-impregnation with a water and dimethyl sulfoxide mixed solution as a solvent to prepare the double-metal supported catalyst Cu-Pt/CeO2-Al2O3. Compared with the prior art, the catalyst shows high catalytic activity under a normal workingcondition and can effectively suppress performance reduction of a catalyst active component due to sulfur in the waste gas. The process is suitable for mass production, has the possibility of industrial production and has extensive application prospect.

The invention discloses an anti-propylene mask and a preparation method thereof. The anti-propylene mask is formed by sewing a fiber cloth contact layer, an anti-static non-woven fabric layer and a fullerene/nano titanium dioxide spunbond layer which are sequentially arranged, wherein the fullerene/nano titanium dioxide spunbond layer is prepared by spinning a modified resin material into a fiberweb by adopting a spunbond method; the modified resin material is prepared from the following raw materials: matrix resin, a carboxylated fullerene derivative, nano titanium dioxide, a lubricating agent and a coupling agent, the modified resin material is prepared by the following method: mixing and reacting a carboxylated fullerene derivative with nano titanium dioxide to prepare nano titanium dioxide modified by the carboxylated fullerene derivative, and then blending and extruding the nano titanium dioxide modified by the carboxylated fullerene derivative with the rest components in the rawmaterials to prepare the modified resin material. The mask is convenient to use and carry, can prevent propylene from entering a human body from respiratory organs of the human body, is good in anti-propylene effect, has an anti-static function, and is particularly suitable for being used in a propylene production workshop.

The invention relates to a catalyst for removing formaldehyde in wastewater, a preparation method of the catalyst and a method for removing formaldehyde in wastewater, and belongs to the technical field of wastewater treatment. The catalyst is formed by coating nanoparticles with the particle size of below 100 nm with graphene oxide. Nanoparticles with the particle size of below 100 nm in the catalyst can effectively improve the dispersity of graphene oxide in wastewater to guarantee that graphene oxide can be evenly dispersed in a reaction system without sedimentation, so that graphene oxidecan make full contact with formaldehyde and hydrogen peroxide in wastewater, and formaldehyde is efficiently removed. And graphene oxide in the catalyst can improve the oxidation capacity of hydrogenperoxide and can also avoid invalid decomposition of hydrogen peroxide. A hydrogen peroxide solution and the catalyst are sequentially added into formaldehyde-containing wastewater, and a stirring reaction is performed for 2-24 hours at a temperature of 25-75 DEG C. By adopting the method, formaldehyde in the wastewater can be effectively removed, the environmental problem caused by taking inorganic acid or alkali as the catalyst in the prior art is solved, and the method is environment-friendly, safe and non-toxic.

The invention relates to a method for removing formaldehyde in wastewater by catalytic oxidation, and belongs to the technical field of wastewater treatment. Formaldehyde as a raw material, a transition metal oxide as a catalyst and a hydrogen peroxide solution as an oxidizing reagent are stirred and reacted for 15-60 minutes at 25-45 DEG C, and formaldehyde is catalytically oxidized into carbon dioxide and water, wherein the transition metal oxide is selected from any one of Fe2O3, Co2O3, NiO, CuO and ZnO. According to the method, formaldehyde in the wastewater can be effectively removed, the catalyst is easy to recover and can be repeatedly used, excessive hydrogen peroxide can be decomposed into water and oxygen, and the method is environmentally friendly, safe and non-toxic.

The invention discloses a preparation method of a two-dimensional flaky porous composite oxide and application of the two-dimensional flaky porous composite oxide in control of chlorine-containing volatile organic pollutants. The method comprises the following steps: adding a zinc nitrate hexahydrate water solution into a methanol solution of dimethylimidazole, stirring until the solution is white, and performing filtering, and drying to obtain white powder; adding a cobalt nitrate hexahydrate aqueous solution into a white powder aqueous solution, adding ammonia water, stirring, carrying out hydrothermal crystallization at 120-160 DEG C for 8-12 hours, then, performing drying and roasting to obtain the two-dimensional flaky porous composite oxide. The two-dimensional flaky catalytic material prepared by the invention has a very rich pore structure and high-dispersion active sites, and can effectively improve the mass transfer and transmission capacity of target pollutants, thereby showing excellent chlorine-containing volatile hydrocarbon oxidation performance. The preparation method is low in raw material price, simple in synthesis method, simple in synthesis condition and low in equipment requirement, and has a good industrial application prospect.