1736 results about "Catalytic transformation" patented technology

An article for joule heating is described, including a three-dimensional substrate on and / or in which a pyrolyzate of a phenolic resin or polymer forms an electrically conductive carbon network. Such articles may be incorporated in structured materials applications, which may include support, sorbent, and or catalyst components. Also described are methods of fabricating such articles and structured materials, and apparatus comprising same, and methods of use of such articles and structured materials and apparatus for conducting material transformation processes requiring input of heat for their performance, such as CO2 adsorption, methane pyrolysis for hydrogen and carbon production, hydrogen-assisted conversion of CO2 to hydrocarbons, including catalytic conversion of CO2 to olefins, catalytic conversion of CO2 to propane (liquefied petroleum gas), and catalytic conversion of CO2 to renewable natural gas, reverse water gas shift reaction, steam ethane cracking, propane cracking, steam methane reforming, and dry methane reforming.

The invention relates to the technical field of enzyme engineering, in particular to an L-glutamate oxidase mutant as well as preparation and application thereof. Through mutation of the 77th amino acid and the 171st amino acid, the active center configuration of the enzyme is optimized, the binding capacity with a substrate and the catalytic conversion efficiency are enhanced, and the enzyme activity is remarkably improved. The mutant disclosed by the invention shows stronger specificity to L-glutamic acid (salt), effectively reduces non-specific reaction and improves the product purity. And in the presence of a high-concentration substrate, the enzyme activity is not inhibited by the substrate. The prepared L-glutamate oxidase mutant with high enzymatic activity can be efficiently expressed in escherichia coli, the problem that the expression quantity of natural enzymes in streptomyces is limited is solved, the acquisition efficiency of the enzymes is greatly improved, and the production cost is reduced. The mutants can be directly applied to biological manufacturing of alpha-ketoglutaric acid, so that the production efficiency of products is remarkably improved.

The invention relates to the technical field of sulfur hexafluoride gas thermocatalytic conversion, and discloses a supported catalyst for SF6 thermocatalytic conversion and a preparation method thereof, and the preparation method comprises the following steps: titanium dioxide is supported on the surface of SiC in a nanoscale particle form, and the mass ratio of titanium dioxide to silicon carbide is 1: 5. The catalyst and the preparation method provide possibility for harmless treatment of SF6 under milder conditions, and the provided preparation method has the advantages of high loading efficiency, simple preparation device, reduction of the preparation cost, increase of the effective reaction area of the catalyst, and good application potential and popularization prospect.

The invention relates to the technical field of biological catalysis, and discloses an L379A mutant enzyme for preparing rebaudioside I. The enzyme is obtained by the following mutations generated by UGT76G1: leucine of the 379th amino acid sequence is mutated into alanine; the enzyme can be applied to RA in-vitro conversion preparation of RI with higher utilization value, the conversion rate is higher than 50%, and the enzyme activity is remarkably improved by 7 times compared with the original enzyme catalytic conversion enzyme activity. The UGT76G1 mutant disclosed by the invention has the advantages that (1) the blank is filled, and a special enzyme catalyst capable of realizing efficient in-vitro synthesis of rebaudioside I (RI) is provided for the first time; 2) efficiency jump: the catalytic conversion rate is greatly increased from original about 7% to more than 50% (increase gt; and 3) stability and reliability: in the cross-scale reaction of 10mL to 5L, the catalyst has stable catalytic performance, shows excellent industrial application potential, and is suitable for popularization and application.

A mobile and stationed charging system for electric cars designed to expand the charging infrastructure instead of the limited charging stations connected to public electricity networks, charging on the power of soundless electric generators to avoid noise, and operating on gasoline, diesel, natural gas, or hydrogen. To protect the environment, palladium is used in the catalytic converter to purify the exhaust gas, and a third level rapid charging device “high power charger” (HPC) is added. Fixed stations are integrated within the scope of traditional gas stations and may share with them the use of one of the fuels. Mostly they are independent. They can be installed and operated anywhere, either mobile stations on conventional or electric self-driving cars or with a driver with sufficient fuel tanks, with communication devices to meet charging requests anywhere. The charging system could be a solution for expanding the charging infrastructure.

An article for joule heating is described, including a three-dimensional substrate on and / or in which a pyrolyzate of a phenolic resin or polymer forms an electrically conductive carbon network. Such articles may be incorporated in structured materials applications, which may include support, sorbent, and or catalyst components. Also described are methods of fabricating such articles and structured materials, and apparatus comprising same, and methods of use of such articles and structured materials and apparatus for conducting material transformation processes requiring input of heat for their performance, such as CO2 adsorption, methane pyrolysis for hydrogen and carbon production, hydrogen-assisted conversion of CO2 to hydrocarbons, including catalytic conversion of CO2 to olefins, catalytic conversion of CO2 to propane (liquefied petroleum gas), and catalytic conversion of CO2 to renewable natural gas, reverse water gas shift reaction, steam ethane cracking, propane cracking, steam methane reforming, and dry methane reforming.

The present application relates to a phosphorus-aluminum sol, a preparation method therefor, and a use thereof as a binder in a hydrocarbon oil conversion catalyst. The present application also relates to a hydrocarbon oil conversion catalyst, a preparation method therefor, and a hydrocarbon oil catalytic conversion method using the catalyst. The phosphorus-aluminum sol provided by the present application has an appropriate colloidal particle size, a high degree of polymerization, high stability, and good adhesion, when used in a catalyst containing a molecular sieve, such as an FCC catalyst, the phosphorus-aluminum sol can reduce the blockage of molecular sieve pores, and when synergizing with other matrix materials in the catalyst, the phosphorus-aluminum sol can improve hydrothermal stability, catalytic performance and mechanical strength of the catalyst.

The invention relates to a fly ash-based MOFs adsorption-catalysis material integrated preparation method, and belongs to the field of solid waste treatment and resource utilization. The material takes industrial solid waste fly ash as a matrix, and is prepared by the following steps: firstly, carrying out alkali modification and silane coupling agent surface activation treatment on fly ash to form a high-activity matrix; then loading a metal organic framework (MOFs) on the surface of the activated fly ash through an in-situ synthesis process to form a porous composite carrier; the integrated material with CO2 adsorption and catalytic conversion functions is further prepared through impregnation of a copper-based active component and a high-temperature calcination process. According to the invention, the problems of high energy consumption, high cost and low comprehensive utilization rate of fly ash of the traditional CO2 capture and utilization technology (ICCU) are solved, high-valued resource utilization of industrial solid waste and efficient capture and conversion of CO2 are synchronously realized, and the method has dual values of environmental protection and economy.

The invention relates to the chemical field of efficient catalytic conversion of biomass platform compounds into high-added-value chemicals, and particularly provides a preparation method of a flower-shaped nickel aluminum oxide and application of the flower-shaped nickel aluminum oxide in preparation of furfuryl alcohol through catalytic transfer hydrogenation of furfural. The preparation method mainly comprises the following steps: dissolving 0.01 mol of aluminum nitrate, 0.02 mol of nickel nitrate and 0.084 mol of urea in 60 ml of deionized water, stirring at room temperature for 1 h to form a clear solution, transferring the clear solution into a lining of a hydrothermal kettle, aging at 140 DEG C for 7 h, naturally cooling to room temperature, and repeatedly washing with deionized water until the pH value of supernate is 7; and dispersing the separated green muddy precipitate in 200ml of methanol, stirring at room temperature for 2 hours, filtering and washing, and drying at 60 DEG C for 24 hours. And grinding the obtained hydrotalcite precursor into powder, putting the powder into a quartz boat, and carrying out high-temperature calcination for 2 hours in argon flow of 60 ml / min at the temperature of 500 DEG C to finally obtain the grey green solid catalyst. The metal oxide prepared by the invention has the characteristics of uniform components, rich acid-base sites and the like as a catalyst, and has the characteristics of simple preparation method, no need of reduction, environment friendliness and the like when being applied to industrial production. Therefore, when the catalyst is applied to a reaction for preparing furfuryl alcohol through furfural transfer hydrogenation, efficient conversion of furfural can be realized, the conversion rate can reach 100%, and the selectivity is 92.1%.

The invention provides a method for catalytically converting waste PET (Polyethylene Terephthalate) plastic into 1, 4-cyclohexanedimethanol by a two-step method, which comprises the following steps of: 1, hydrogenating the waste PET plastic dispersed in methanol under the action of a nickel-based catalyst to obtain dimethyl 1, 4-cyclohexane dicarboxylate; and 2, centrifugally separating the catalyst and the reaction liquid in the step 1, and hydrogenating the reaction liquid under the action of a CuMgAl catalyst to obtain the target product 1, 4-cyclohexanedimethanol. The 1, 4-cyclohexanedimethanol is a key raw material for producing high-end polyester, and has very high market requirements. Under the optimal reaction condition, the molar yield of the 1, 4-cyclohexanedimethanol can reach 83.8%, and the separation purity reaches up to 99.5%. According to the method, upgrading and recycling of the PET waste are achieved so as to cope with the threat of white pollution to the ecological environment and human health.

The invention discloses an anode material for adipic acid monoester electrolysis and a preparation method of the anode material, the electrode solves the key problems that a platinum layer is easy to fall off, the catalytic activity is low, the organic matter poisoning resistance is poor and the like of a traditional titanium platinum-plated electrode through multi-scale interface strengthening and nano structure regulation and control; the preparation method comprises the following core steps: constructing a porous ZrO2-TiO2 composite oxide layer on the surface of a titanium substrate by adopting a micro-arc oxidation-hydrothermal composite process, and generating platinum nanoparticles in situ to pre-fill pores, so that the anchoring effect of a platinum layer is remarkably enhanced; depositing a platinum / carbon nano tube (Pt / CNT) composite catalyst layer on the surface of the oxide layer through a pulse-ultrasonic synergistic electroplating technology, wherein the carbon nano tube is used as a conductive framework to inhibit platinum agglomeration; through vacuum annealing and electrochemical activation treatment, the interface bonding force and active site exposure are further optimized; the electrode shows excellent performance in an adipic acid monoester electrolysis system, and efficient electrocatalytic conversion from adipic acid monomethyl ester to dimethyl sebacate is achieved.

The invention discloses a lubricating oil preparation method, which comprises: contacting a raw material containing waste rubber with a catalyst in a closed container in a hydrogen atmosphere, and carrying out a catalytic cracking reaction to obtain a lubricating oil-containing product, the catalyst comprises a carrier, an acidic component and an active component loaded on the surface of the carrier, the active component is selected from at least one of a ruthenium elementary substance, a rhodium elementary substance, a platinum elementary substance, a palladium elementary substance, an iridium elementary substance and a nickel elementary substance; the acidic component is selected from at least one of silicotungstic acid, ammonium metatungstate, phosphotungstic acid and tungstic acid. The invention discloses a new path for preparing the lubricating oil by utilizing the waste rubber through a carbon = carbon hydrogenation and carbon-carbon bond breakage strategy under a relatively mild condition. According to the path, new application of waste rubber catalytic conversion is developed through C = C hydrogenation and C-C bond fracture strategies, and a new method for synthesizing lubricating oil with important application value is provided.

Systems and methods for implementing protections against catalytic converter theft. A vehicle may comprise Ultra-Wideband (UWB) anchors or sensors. The UWB sensors of a vehicle may be used to detect the relative distance and / or location of UWB-capable devices in close proximity to the vehicle. An assessment may be performed using the UWB anchors and / or other sensors to determine whether the presence of the unknown device is indicative of a threat to the vehicle. If a threat is detected, one or more protection steps may be taken.

A method for supplying power to a heating device for a motor vehicle is described, in which the motor vehicle includes: a) an electric network; b) a catalytic converter including an electric heating device connected to the electric network; c) a battery electrically connected to the electric network; and d) an electric machine electrically connected to the electric network. The method includes: a) detecting a request for activation of the heating device; b) activating the generator mode of the electric machine; c) sending a voltage delivery instruction to the electric machine in order to supply the electric network with power; d) detecting a request for deactivation of the heating device; and e) deactivating the generator mode of the electric machine and a step of disconnecting the heating device.

The invention relates to the field of biomass energy and chemical industry, in particular to an efficient methanol preparation method based on biomass graded catalytic conversion and cycle coupling. The method comprises the following steps: in a graded catalytic oxidation reaction system, mixing a biomass raw material with a composite vanadium-based catalyst, water, oxygen and circulating methanol for reaction to generate a gas-liquid mixture containing methyl formate; recycling methyl formate by using a gradient variable-pressure rectification separation system; carrying out an interface hydrogenation reaction under the action of a copper-zinc-LTA hierarchical pore catalyst to generate methanol; finally, part of methanol is purified and recycled through membrane separation. The method realizes efficient conversion from biomass to methanol, has the advantages of mild reaction conditions, low energy consumption, high yield and good catalyst stability, and opens up a new path for industrialization of preparation of methanol from biomass.

The invention belongs to the technical field of organic synthesis, particularly relates to a catalyst capable of being applied to preparation of cyclic carbonate substances, and further relates to a method for applying the catalyst to preparation of the cyclic carbonate substances. According to the method, a complex formed by a bipyridine diamine ligand and a metal salt is used as a catalyst, CO2 conversion is catalyzed in an acetonitrile solvent or in the absence of a solvent at different temperatures, pressures and reaction times, and cyclic carbonate is generated. And after the reaction is finished, further purifying through a silica gel column, and removing the solvent after reduced pressure distillation to obtain the cyclic carbonate substance. Compared with other synthesis methods, the method for preparing the cyclic carbonate substances by catalyzing CO2 conversion through the single-component catalytic system has the advantages of being high in activity, mild in reaction condition, good in selectivity, free of additional additives and the like. The method has good applicability to substrates containing different types of functional groups, and a series of cyclic carbonate substances are successfully synthesized.

The invention provides a multi-temperature-zone variable-working-condition ortho-parahydrogen continuous catalytic conversion characteristic test system and method, and relates to the technical field of ultralow temperature. The system comprises a test device used for cooling raw material hydrogen to a first temperature zone, then cooling the raw material hydrogen to a second temperature zone through an ortho-parahydrogen conversion heat exchanger and converting ortho-hydrogen in the raw material hydrogen into parahydrogen; the control analysis device is used for providing raw material hydrogen, providing a cold source and detecting and analyzing the parahydrogen content in the gas before and after conversion of the ortho-parahydrogen conversion heat exchanger; the auxiliary device is used for providing a high-vacuum environment required by low temperature for the test; the ortho-parahydrogen conversion heat exchanger can take away conversion heat generated in the conversion process while promoting conversion from ortho-hydrogen to parahydrogen; the control analysis device can adjust the proportion of ortho-hydrogen and parahydrogen in the raw material hydrogen. The method applies the system. The continuous catalytic conversion performance and heat exchange performance of the ortho-parahydrogen conversion heat exchanger under different working conditions are explored by adjusting the ortho-parahydrogen content in the raw material hydrogen.

Method for calculating NH3 and NOx concentrations downstream from an SCR system of an internal combustion engine (E) of a vehicle by means of a statistical module, the method comprising the following steps: using temperature measurements acquired upstream (T1) and downstream (T2) of the Selective Reduction Catalyst (SCR) as first input variables and NOx mass flow measurements acquired upstream (N1) and downstream (N2) of the SCR as second input variables; calculating an NH3 concentration downstream from the SCR catalytic converter as a function of the first and second inputs.

A process for producing hydrocarbons, usable as fuels, from industrial, agroforestry, urban waste and derivatives thereof, with high sustainability and lower CO2 emissions, given the same energy, with respect to the equivalent fuels of fossil origin, by means of a series of subsequent conversions in which first a syngas is produced,, obtained by gasification of waste with oxygen at high temperature, which is purified and adjusted in composition by modulating the H2 / CO ratio and then converted into methanol. The methanol obtained is in turn catalytically converted into light olefins by means of methanol -to- propylene (MTP) technology; such olefins are catalytically converted by oligomerization in order to obtain a hydrocarbon mixture comprising an ultra-light fraction (C1 and C2 ), a light fraction (C3 and C4), a fraction with a boiling range from 60 to 300°C, and a fraction with a boiling temperature above 300°C to be used for product separation and fractionation treatments.

The invention provides a process method and system for directly capturing carbon dioxide from air and converting and utilizing the carbon dioxide. The process method comprises the following steps: adsorbing raw material gas through a carbon dioxide trapping device, and heating and desorbing to obtain purified carbon dioxide gas; the purified carbon dioxide gas and the electrolyte are subjected to electrocatalytic conversion to obtain synthesis gas, oxygen and condensate water, and the condensate water is recycled through water treatment operation to be used for supplementing the electrolyte; the method comprises the following steps: carrying out Fischer-Tropsch synthesis reaction, hydrocracking and isomerization reaction on synthesis gas to obtain an isomerized oil-gas mixture, wherein heat energy generated by the reaction provides heating desorption heat; and carrying out gas-liquid separation on the heterogeneous oil-gas mixture to obtain combustible gas and an upgraded oil product, carrying out rectification operation on the upgraded oil product to obtain an SAF component and a heavy oil product, and carrying out oxygen-enriched combustion reaction on the combustible gas and oxygen to provide heating desorption heat or supply required heat energy. An integrated and flexible industrial technology platform is developed, carbon capture and conversion processes are seamlessly connected, full-chain optimization from CO2 removal to high-added-value product generation is realized, and self heat energy requirements and wastewater utilization can be met.

An electrically conductive circuit has a distal end coupled to a catalytic converter of a vehicle. A sensor such as a voltage divider is coupled to a proximal end of this conductive circuit. The voltage divider senses when a resistance associated with the conductive circuit is altered, indicative of catalytic converter tampering. An alarm signal can then be sent to the vehicle horn or otherwise beneficially outputted to warn of the tampering. The conductive circuit preferably includes a length of nichrome wire having a substantial resistance. Reliable electrical connection and tampering avoidance can be provided at the distal end of the nichrome wire by utilizing an electrically conductive washer at the distal tip, covering the nichrome wire with high temperature insulating tape, overlying the tape with a pipe clamp and encapsulating the washer, distal end of the nichrome wire, insulating tape and pipe clamp with a high temperature bonding adhesive.

The invention belongs to the technical field of catalytic chemistry, and particularly relates to a method for enhancing photoelectric composite catalytic reaction efficiency through self-adaptive multi-field coupling. Specifically, firstly, a closed columnar reactor composed of an LED array, a reflection / lens system, a copper-nickel alloy cathode, a Ru-doped PbO2 anode, a Ti5O7 / Ti3O4 composite photocatalytic parallel-connection multi-tube plate and the like is built, a distributed silicon photodiode and a quantum dot fluorescent probe sensor are installed, a machine learning algorithm is utilized, and according to the reactant concentration and the by-product generation condition, the quantum dot fluorescent probe sensor and the quantum dot fluorescent probe sensor are analyzed. Light field conditions (wavelength, intensity and distribution) used by photocatalysis, electric field conditions (current, voltage and power line distribution) used by electrocatalysis and flow field conditions (flow velocity, flow rate and distribution) are dynamically adjusted to optimize the chemical reaction rate, and an AI model is combined to predict an optimal multi-field coupling setting scheme, so that the efficiency is improved, the energy consumption is reduced, and the cost is reduced. Meanwhile, the effect of enhancing the catalytic conversion reaction is achieved.

According to the cobalt-doped molybdenum disulfide lithium-sulfur battery composite positive electrode material, the preparation method and the application, a cobalt-doped stable molybdenum disulfide defect structure composite nitrogen-doped graphene material is prepared by combining a solvothermal method and an annealing technology, and the process is mature; the method is simple, and the composite positive electrode material with high sulfur content is easy to obtain. According to the lithium-sulfur battery composite sulfur positive electrode material disclosed by the invention, the strong chemical adsorption effect and catalytic conversion effect of the cobalt-doped stable molybdenum disulfide defect structure composite nitrogen-doped graphene carrier on polar lithium polysulfide are utilized, so that the diffusion of the lithium polysulfide in an ether electrolyte is inhibited, and the electrochemical reaction kinetics is improved; therefore, the shuttling effect is slowed down, and the lithium-sulfur battery has the characteristics of high capacity and long service life.

The invention relates to the technical field of nano catalytic materials, and discloses a sulfur-tolerant CO oxidation catalyst as well as a preparation method and application thereof. The method comprises the following steps: (1) in the presence of carrier gas, contacting a platinum source with a to-be-plated base material to carry out first contact reaction to obtain a material I; (2) in the presence of carrier gas, passivating a modifier and the material I to obtain a passivated material; (3) carrying out second contact reaction on the passivation material and a second metal source to obtain a material II; and (4) carrying out a third contact reaction on a hydrazine reducing agent and the material II, and roasting a product obtained after the third contact reaction to obtain the sulfur-tolerant CO oxidation catalyst. The sulfur-tolerant CO oxidation catalyst prepared by the method provided by the invention has the advantages of high metal additive dispersity, high catalytic conversion rate, low activation temperature and excellent catalytic stability in a sulfur-containing atmosphere.

The invention belongs to the technical field of gene engineering, and particularly relates to fusion vitamin D hydroxylase and application thereof in preparation of 25-hydroxy vitamin D2 and 25-hydroxy vitamin D3. The fusion vitamin D hydroxylase comprises a Vdh-K1 heme structural domain of which the amino acid sequence is shown as SEQ ID NO.1, a CYP116B65 redox structural domain of which the amino acid sequence is shown as SEQ ID NO.3, and a linker for connecting the Vdh-K1 heme structural domain and the CYP116B65 redox structural domain. The fusion vitamin D hydroxylase is a self-sufficiency enzyme, and can realize stable catalytic conversion of vitamin D2 and vitamin D3 on the premise of not depending on an Fdx and Fdr assisted electron transfer system.

Exhaust assemblies for vehicles and methods of installing exhaust systems on vehicles are disclosed. An exhaust assembly for a vehicle includes an exhaust inlet to receive combustion products from a drive unit, a catalytic converter to control emissions from combustion products received by the exhaust system, and a first piping assembly coupled to the exhaust inlet and the catalytic converter.

The invention relates to a method for preparing low-carbon olefin, which comprises the following steps: contacting an olefin-rich raw material with a thermal regeneration catalyst, and carrying out a first catalytic conversion reaction in a dense-phase fluidized bed layer of a first reactor provided with an instant energy supplement system, the reacted material flow is rapidly cooled through a cooling area, close to the upper part, in the first reactor, so that the reacted material flow is cooled to a target temperature of 450-530 DEG C and then is sent out of the first reactor. According to the method, heat is immediately supplemented for the dense-phase fluidized bed layer, so that the olefin-rich raw material is subjected to catalytic cracking reaction within a proper reaction temperature range, the influence caused by overlarge temperature drop in the reaction process is reduced, and the light raw material is promoted to be subjected to single-molecule cracking reaction; and the yield and the selectivity of low-carbon olefins with high added value, such as ethylene, in the obtained product are improved.

The invention belongs to the technical field of electrochemistry, and discloses a pi-d conjugated covalent organic framework material, and a preparation method thereof comprises the following steps: adding 2, 5-hydroxyterephthalic acid, 2, 3, 5, 6-tetra (amino) p-benzoquinone and nickel acetate tetrahydrate into a container, then adding N-methyl pyrrolidone, carrying out ultrasonic treatment for 0.5 h, transferring into a hydrothermal reaction kettle, carrying out a sealed reaction for 2-5 days, and carrying out vacuum drying to obtain the pi-d conjugated covalent organic framework material. And after the reaction is finished, naturally cooling to room temperature, filtering, collecting, washing and performing vacuum drying on the obtained precipitate to obtain the pi-d conjugated covalent organic framework material. The covalent organic framework material disclosed by the invention is rich in N / O chemical adsorption sites and Ni < 2 + > catalytic sites, so that shuttling of polysulfide can be effectively inhibited; on the other hand, catalytic conversion of polysulfide is promoted, the reaction kinetics of the lithium-sulfur battery is further accelerated, and compared with a traditional covalent organic framework, the conductivity is greatly improved, and the electron transmission capacity is improved.

The invention discloses a coated SiC-coated NiFe microwave catalyst, a preparation method thereof and an application of the coated SiC-coated NiFe microwave catalyst in catalytic conversion of polyolefin plastics, and relates to the technical field of preparation of catalysts and chemical recovery of plastics. The coated SiC-coated NiFe microwave catalyst comprises a porous silicon carbide round rod and a nickel-iron alloy catalyst layer coated on the surface of the porous silicon carbide round rod. According to the coated SiC-coated NiFe microwave catalyst, a porous SiC rod is coated with NiFe-gel through a sol-gel method, a precursor is prepared, and then thermal reduction treatment is performed, so that the coated SiC-coated NiFe microwave catalyst is obtained. According to the coated SiC-coated NiFe microwave catalyst disclosed by the invention, polyolefin plastic can be quickly and highly selectively converted into hydrogen and carbon nanotubes. Compared with the traditional chemical recovery technology, the method has the characteristics of rapid reaction, high selectivity and environmental protection. And the coated SiC-coated NiFe microwave catalyst has the advantages of simple synthesis method, excellent wave absorbing performance, low energy consumption, stable performance and the like, is a recycled material which is more energy-saving and lower in cost, and shows wide practical application value.

The invention discloses a bismuth catalyst for electrocatalytic conversion of carbon dioxide and a preparation method of the bismuth catalyst. The preparation method comprises the following steps: preparing bismuth salt and an organic solvent into a saturated organic precursor solution containing Bi < 3 + >; wherein the bismuth salt is BiCl3, Bi (NO3) 3.5 H2O, Bi2 (SO4) 3, Bi (CH3COO) 3 or Bi (C6H5O7); the organic solvent is one or a combination of more of ethylene glycol, glycerol, acetone and diethyl ether; a saturated organic precursor solution containing Bi < 3 + > is used as an electrolyte to form an electrolysis system with two platinum sheet electrodes; carrying out constant-current electro-deposition on the electrolysis system under a stirring condition; wherein the cathode is used as a working electrode, the current density of the cathode is 10-500mA / cm < 2 >, and the deposition time is 30-200min; in the constant-current electro-deposition process, Bi < 3 + > in the saturated organic precursor solution is reduced to form metal Bi particles, and the particles are deposited to obtain the flocculent porous bismuth catalyst. The prepared bismuth catalyst has a loose and porous structure, can provide abundant active sites, can effectively promote electron transport and CO2 mass transport, and realizes efficient catalysis of reduction of carbon dioxide to prepare formic acid or formate.