3439results about "Heterogenous catalyst chemical elements" patented technology

The invention discloses a preparation method of a CuZnAlGa hydrotalcite-like derivative catalyst for preparing methanol from synthesis gas rich in carbon dioxide. Cu metal salt, Zn metal salt, Al metal salt and Ga metal salt are used as precursors, Na2CO3 and NaOH are used as precipitants, a mixed alcohol-water solution is used as an auxiliary solvent for coprecipitation, constant temperature and pH value are controlled, and a hydrotalcite-like structure catalyst precursor is obtained. And the precursor is subjected to high-temperature roasting and in-situ reduction in the hydrogen atmosphere, and then the layered framework structure with the Cu nano-particles fixed by the oxide is obtained. The hydrotalcite-like structure plays a role in crystal lattice confinement to prevent Cu particle aggregation, and the interaction between Cu and the oxide improves the adsorption capacity of the surface of the catalyst to CO and CO2, and enhances the activity and stability of methanol prepared from carbon dioxide-rich synthesis gas.

The invention relates to a denitration catalyst capable of resisting alkali metal, water and sulfur composite poisoning and a preparation method and application thereof, and belongs to the field of environment-friendly catalytic materials and air pollution control. An organic solvent is used as a template agent, cerium oxide, manganese oxide and tungsten oxide are used as active components, and a cerium-manganese-tungsten composite oxide active component with a porous structure and strong acidity is prepared by a coprecipitation-soft template method. The catalyst has a wide denitration temperature window, high denitration efficiency and excellent composite poisoning resistance stability. The catalyst component is environment-friendly, low in cost and simple in preparation method, and is particularly suitable for stable and efficient purification of NOx in complex flue gas in the cement industry.

The invention provides a novel acrylonitrile catalyst and a preparation method thereof. The novel acrylonitrile catalyst is prepared from the following raw materials: mixed salt, an active component, silica sol, a rare earth precursor, a carrier and a cosolvent, by introducing the cosolvent and optimizing the carrier structure, the dispersity of the rare earth precursor is improved, the production process is optimized, the doping efficiency of the rare earth precursor is remarkably improved, the activity, selectivity and stability of the novel acrylonitrile catalyst are improved, generation of by-products CO, CO2, acrolein and acrylic acid during acrylonitrile production can be reduced, and industrial efficient preparation is achieved.

A three-way catalyst article, and its use in an exhaust system for internal combustion engines, is disclosed. The catalyst article for treating exhaust gas comprising: a substrate comprising an inlet end and an outlet end with an axial length L; a first catalytic region comprising a first platinum group metal (PGM) component, wherein the first PGM component comprises Rh and Pt; a second catalytic region comprising a second PGM component, wherein the second PGM component comprises Pd; and wherein the first PGM component has a Pt to Rh ratio of at least 1:20.

A composite catalyst includes a nickel foam and cobalt, copper, or both electrodeposited on the nickel foam. Making the composite catalyst includes contacting the nickel foam with an aqueous solution comprising copper, cobalt, or both, and electrodepositing nanodomains of copper, cobalt, or both, respectively, on the nickel foam. Electrochemically converting nitrate to ammonia includes contacting an electrode and a cathode comprising the composite catalyst in an electrochemical cell with an aqueous solution including nitrate, adsorbing the nitrate onto the copper, the cobalt, or both, reducing the nitrate to yield nitrite, and reducing the nitrite to yield ammonia.

The invention discloses a high-entropy oxide for synergic nitrogen removal and catalysis as well as a preparation method and application thereof, and belongs to the technical field of material preparation, the high-entropy oxide is a single solid solution phase formed by five or more metal elements of Fe, Co, Ni, Cu, Mn, Ti and Ce and an oxygen element, the configuration entropy of the high-entropy oxide is greater than or equal to 1.5 R, R is a gas constant, and R is an oxygen constant. The mole fraction of each metal element is 0.1-0.3, and the sum of the mole fractions of the metal elements is 1. According to the high-entropy oxide with the synergistic nitrogen removal and catalysis effects and the preparation method and application thereof, a synergistic catalysis system is constructed through the high-entropy oxide and silicon carbide, and the high-entropy oxide has the multiple advantages of being high in nitrogen removal efficiency, high in stability, simple in process, environmentally friendly and wide in application range; the removal rate of total nitrogen and key nitrogen pollutants can reach 90% or above in the seawater high-salt environment, and the environment-friendly emission requirement is met.

An ammoxidation catalyst includes a metal oxide represented by Chemical Formula 1, wherein a first peak having intensity of A appears in the 2θ range of 26.3=0.5°, and a second peak having intensity of B appears in the 2θ range of 28.3±0.5° in X ray diffraction analysis by CuKα, and an intensity ratio (A / B) of the first peak to the second peak is 1.5 or more:MoxBiaFebAcBdCeDfOy  Chemical Formula 1wherein in Chemical Formula 1,A and B are different from each other, and each independently, are one or more elements of Ni, Mn, Co, Zn, Mg, Ca, and Ba,C is one or more elements of Li, Na, K, Rb, and Cs,D is one or more elements of Cr, W, B, Al, Ca, and V,a to f, x, and y are respectively mole fractions of each atom or atomic group,a is 0.1 to 7, b is 0.1 to 7, provided that the sum of a and b is 0.1 to 7,c is 0.1 to 10, d is 0.01 to 5, e is 0.1 to 10, f is 0 to 10,x is 11 to 14, y is a value determined by each oxidation number of Mo, Bi, Fe, A, B, C, and D.

The invention relates to a method for preparing methanol based on carbon dioxide capture, and a method for preparing ethylene glycol and environment-friendly polyester. The method comprises the following steps: capturing and purifying a byproduct high-concentration carbon dioxide gas flow in a petroleum refining process into high-purity carbon dioxide, and sequentially carrying out hydrogenation reaction and preparation of green methanol in three stages of fixed bed reactors, a copper-zinc-calcium-magnesium-aluminum hydrogenation catalyst is adopted in the first-stage reactor and the third-stage reactor, and the copper-zinc-calcium-magnesium-aluminum hydrogenation catalyst is adopted in the second-stage reactor and the third-stage reactor. And a copper-zirconium-titanium-vanadium deposition type hydrogenation catalyst is adopted in the second-stage reactor. The green ethylene glycol can be prepared from the green methanol through an MTO process, ethylene oxidation and ethylene oxide hydrolysis. The environment-friendly carbon-reducing polyester can be prepared from the green ethylene glycol and terephthalic acid PTA through slurry preparation, esterification reaction and polymerization reaction; in the esterification and polymerization process, by adding a specific esterification catalyst and a compound stabilizer, the performance of the environment-friendly carbon-reducing polyester can be improved, and the performance of the environment-friendly carbon-reducing polyester is equivalent to that of a polyester product corresponding to petrochemical method ethylene glycol.

The invention relates to a preparation method of a catalyst for synthesizing 2, 6-dimethylphenol, which comprises the following steps: mixing ferric salt, aluminum salt, magnesium salt, an acidic material and water to obtain a solution A; mixing sodium silicate, a template agent and water to obtain a solution B; mixing the solution A and the solution B, aging, crystallizing, filtering, drying and calcining to obtain a catalyst precursor I; mixing with an alkaline solution, and filtering to obtain a catalyst precursor II; then mixing with an acidic solution, filtering to obtain a solid, and then washing and calcining to obtain a catalyst; the preparation method of the 2, 6-dimethylphenol comprises the following step of preparing the 2, 6-dimethylphenol by taking methanol, phenol, water and benzoic acid as raw materials in the presence of the catalyst. The catalyst provided by the invention has good catalytic activity, reduces the problem of carbon deposition, and has good selectivity and high phenol conversion rate when being used for preparing 2, 6-dimethylphenol.

The invention discloses a high-entropy perovskite oxide catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalysts. The chemical general formula of the high-entropy perovskite oxide catalyst is La (MMN) O3, and M is a transition metal element with high electronegativity. M is a mixture of Ni, Cu, Co and Fe elements. The molar ratio of La to Ni to Cu to Co to Fe to Mn is (0.9 to 1): (0.15 to 0.25): (0.15 to 0.25): (0.15 to 0.25): (0.15 to 0.25): (0.15 to 0.25): (0.15 to 0.25). The La (MMN) O3 catalyst is of a rod-shaped structure formed by stacking particles. According to the high-entropy perovskite oxide catalyst as well as the preparation method and the application thereof, the B site of perovskite is doped by the high-electronegativity transition metal element, so that the Mn-O covalence is enhanced, and the catalytic performance is improved; the catalyst is prepared in an electrostatic spinning and calcining mode, a rod-shaped structure with accumulated nano-particles is obtained, the surface area of the catalyst is increased, and the catalytic effect is improved.

Disclosed are high-entropy oxides, and methods of their preparation. The high-entropy oxide is characterised by a sub-micron particle size and rod-like particle shape. The method of its preparation includes a co-precipitation step, preferably using an oxalate compound as a precipitating agent. Also disclosed are an electrode, e.g. an anode, a catalyst and an electrochemical cell comprising the high-entropy oxide.

The invention discloses a metal oxide modified high-entropy alloy catalyst and a preparation method and application thereof, the metal oxide modified high-entropy alloy catalyst is a supported Ni-Ga-Cu-In-Zn-Fe high-entropy alloy catalyst with a mixed metal oxide of X, Mg and Al as a carrier, the metal X is Zr or Ce, preferably Zr; the catalyst is prepared through a one-step precipitation method, a co-precipitation and impregnation method or a two-step precipitation method by utilizing the characteristic that main body laminate composition and elements of a layered hydroxide (LDHs) material are adjustable; the metal oxide modified high-entropy alloy catalyst has the characteristics of high catalyst metal particle dispersity, high catalytic activity, good selectivity and long service life due to the introduction of ZrO2 or CeO2, and can reach a higher CO2 conversion rate in a relatively low temperature interval, so that the CO2 conversion rate and the single-pass yield of methanol are remarkably improved, and the catalyst has the advantages of low cost and high efficiency. Therefore, the utilization efficiency of carbon resources is improved, and the method has a good industrial application prospect.

The invention discloses a large-aperture aluminum oxide loaded copper-based catalyst as well as preparation and application thereof. The large-aperture alumina-loaded copper-based catalyst comprises a large-aperture alumina carrier, and copper oxide and lanthanum oxide loaded on the surface of the large-aperture alumina carrier, the large-aperture alumina-loaded copper-based catalyst is granular, the specific surface area is 250-500 m < 2 > / g, the pore volume is 1.0-2.0 cm < 3 > / g, the average aperture is 16-30 nm, and the pore diameter of the large-aperture alumina-loaded copper-based catalyst is 20-30 nm. The large-aperture alumina supported copper-based catalyst comprises the following components in percentage by mass: 79%-98.9% of a large-aperture alumina carrier, 0.1%-6% of copper oxide and 1%-15% of lanthanum oxide. The large-aperture aluminum oxide loaded copper-based catalyst disclosed by the invention shows relatively high catalytic activity and higher alcohol selectivity in a reaction for preparing higher alcohol from ethanol, and particularly has relatively high C6-C10 fatty alcohol selectivity.

The invention discloses an anti-fouling high-voltage electrocatalytic activity polyvinylidene fluoride uranium adsorption material and a preparation method thereof, and belongs to the field of uranium adsorption materials.According to the adsorption material, dimethyl sulfoxide serves as a solvent, polyvinylidene fluoride serves as a substrate material, amidoximation polyacrylonitrile serves as a modified molecule, and B i4T i3O12 / SnO2 serves as filler, and after physical blending, the adsorption material is prepared into the high-voltage electrocatalytic activity polyvinylidene fluoride uranium adsorption material. The composition is prepared by a freezing phase inversion method. The adsorbing material disclosed by the invention has an excellent removal rate on uranyl ions and has an excellent antibacterial property.

Cu-based catalysts with excellent thermal stability for selective hydrogenation and a preparation method thereof are provided. The method includes: first, six mixed metal salts are instantaneously nucleated in an alkaline solution by the nucleation / crystallization isolation method, to prepare high-entropy composite metal hydroxides (H-LDHs) with uniform element distribution and similar metal proportions. Furthermore, well-crystallized high-entropy oxides (HEOs) are obtained based on the structural topology characteristics of H-LDHs, and a series of Cu-Mx / HEOs catalysts with flexible adjustable catalytic microzone geometries and electronic structures are obtained using the HEOs as precursors.

The invention discloses a preparation method of a perovskite type high-temperature-resistant CO2 methanation catalyst, which comprises the following steps: firstly, preparing CaZrO3, then dissolving CaZrO3 powder, a nickel source, a soluble organic fuel and a certain amount of ethylene glycol in deionized water according to a molar ratio of 1: (0.2-0.8): (0.1-0.5), stirring to obtain a dispersion liquid, then putting carrier monoclinic ZrO2 powder in the dispersion liquid, and stirring to obtain the perovskite type high-temperature-resistant CO2 methanation catalyst. The preparation method comprises the following steps: uniformly mixing the raw materials, carrying out ultrasonic treatment for 5-12 hours, heating the obtained mixture at 300-550 DEG C until spontaneous combustion, carrying out high-temperature calcination at 800-900 DEG C for 1-2 hours after flame is extinguished, collecting the calcined product, and carrying out ball milling and granulation to obtain the NiO-CaZrO3 / ZrO2 catalyst with a certain mesh number. According to the preparation method of the catalyst, a solution combustion method is introduced in the preparation process, so that active components of the prepared catalyst are fully dispersed, and further high-temperature calcination is performed on the basis, so that the active components are stably anchored on the surface of the ZrO2 carrier, and the catalytic activity and the stability of the catalyst are improved.

The invention discloses an adsorbent / catalyst based on waste lithium battery recovery and a preparation method and application thereof, and the preparation method comprises the following steps: discharging and disassembling a waste lithium battery, mixing and ball-milling the obtained positive electrode material, metal scrap, PVC and negative electrode graphite material, adding water in the ball-milling process, and carrying out mechanochemical reaction; and after the ball milling is finished, carrying out water leaching treatment on a ball milling product, drying filter residues after the water leaching treatment, and calcining in an inert atmosphere at the calcining temperature of 350-900 DEG C for 0.5-4 hours to obtain the pollutant removal adsorbent / catalyst. The process flow is completed at normal temperature and normal pressure by adopting a mechanochemical method, high-temperature operation is not needed, and the problem of high energy consumption of pyrometallurgy is avoided. Meanwhile, strong acid or strong alkali is not used, no waste liquid or toxic gas is discharged, and compared with a traditional wet metallurgy / wet modified adsorbent / catalyst process, a resource recovery and material preparation technology which is more environmentally friendly and conforms to the green and low-carbon concept is achieved.

The invention discloses a high-oxygen-storage zirconium solid solution material and a preparation method, and belongs to the technical field of rare earth catalytic materials, and the method comprises the following steps: precursor preparation, ultrasonic dispersion, double-gradient precipitation, ultrasonic aging, solid-liquid separation, three-section roasting and furnace cooling. Through the synergistic effect of double-gradient precipitation and ultrasonic aging, coarse grains and non-uniform particle size distribution are avoided, and the material is not prone to abnormal growth of the grains and structural collapse in long-term high-temperature service. Meanwhile, according to the gradient roasting process, through step-by-step regulation and control of crystal densification and crystal lattice reconstruction, separation of a fluorite phase and a pyrochlore phase easily occurring in traditional low-temperature single-section roasting is reduced, a stable crystal phase structure is maintained, it is ensured that the material can still keep sufficient active surface and pore channel structures under the working conditions of high temperature and thermal shock alternation, and the performance of the material is improved. The oxygen storage capacity and the long-term durability of the catalyst carrier are obviously improved.

This invention discloses a method for preparing a CuZnAlGa-based layered double hydroxide (TLH)-derived catalyst for methanol production from carbon dioxide-rich syngas. Using Cu, Zn, Al, and Ga metal salts as precursors, Na₂CO₃ and NaOH as precipitants, and a mixed alcohol-water solution as an auxiliary solvent, co-precipitation is performed under controlled temperature and pH to obtain a LDH-like catalyst precursor. After high-temperature calcination and in-situ reduction in a hydrogen atmosphere, a layered framework structure of Cu nanoparticles immobilized by oxides is obtained. The LDH-like structure provides lattice confinement, preventing Cu particle aggregation, and the interaction between Cu and the oxides enhances the catalyst surface's adsorption capacity for CO and CO₂, thereby improving the activity and stability of methanol production from carbon dioxide-rich syngas.

The invention discloses a large-aperture composite oxide catalyst, a preparation method thereof and a method for preparing higher alcohol from ethanol. The large-aperture composite oxide catalyst comprises copper oxide, lanthanum oxide and aluminum oxide. The large-aperture composite oxide catalyst is prepared by a coprecipitation method, and a nonionic surfactant is added as a pore-enlarging agent in the preparation process. The invention provides a method for preparing higher alcohol from ethanol, a reaction device adopted by the method comprises a main reactor and an auxiliary reactor which are sequentially connected in series, the main reactor is filled with the large-aperture composite oxide catalyst in the first aspect, the auxiliary reactor is filled with a Cu-Zn-Al composite oxide catalyst for aldehyde ester hydrogenation, and the Cu-Zn-Al composite oxide catalyst is used for hydrogenation of higher alcohol. According to the method, the ethanol conversion rate and the yield of high-carbon fatty alcohol with more than C6 are improved.

The invention provides a composite metal oxide catalyst, a preparation method thereof and a methane catalytic cracking method. The catalyst comprises 10%-80% of a dehydrogenation main active component, 5%-50% of a dehydrogenation auxiliary active component and the balance of a carrier, the period of metal elements in the dehydrogenation auxiliary active component comprises at least one of a fourth period, a fifth period and a sixth period, and the group of the metal elements in the dehydrogenation auxiliary active component comprises at least one of an IB group, a VB group, a VIB group and a VIIB group; and / or the metal elements in the dehydrogenation auxiliary active component comprise La series metal; the raw material of the composite metal oxide catalyst comprises a nonionic surfactant. The invention also provides a preparation method of the catalyst and a methane catalytic cracking method using the catalyst. The composite metal oxide catalyst is high in active metal dispersity, long in service life and relatively high in methane conversion rate, and the produced carbon nanotubes are good in quality.

An ammoxidation catalyst includes a metal oxide represented by Chemical Formula 1 supported on a silica carrier, wherein the catalyst has pores having a diameter of 5 to 200 nm, a pore volume of 0.1 to 3.0 cm3 / g, and a BET surface area of 50 m2 / g to 1,000 m2 / g:Mo12BiaFebAcBdCeOx  Chemical Formula 1wherein in Chemical Formula 1,A is one or more elements of Ni, Mn, Co, Zn, Mg, Ca, and Ba,B is one or more elements of Li, Na, K, Rb, and Cs,C is one or more elements of Cr, W, B, Al, Ca, and V, anda to e, and x are respectively fractions of each atom or atomic group, wherein a is 0.1 to 5, b is 0.1 to 5, c is 0.1 to 10, d is 0.1 to 2, e is 0 to 10, and x is 24 to 48.

Methods for making titanated silica supports, titanated chromium / silica pre-catalysts, and activated titanated chromium / silica catalysts are disclosed in which hydrogen peroxide and an alkali metal precursor are used during catalyst preparation. Resulting titanated chromium / silica pre-catalysts often contain silica, 0.1 to 5 wt. % chromium, 0.1 to 10 wt. % titanium, and less than or equal to 4 wt. % carbon, and further contain an alkali metal or zinc at a molar ratio of alkali metal:titanium or zinc:titanium from 0.02:1 to 3:1 and / or at an amount in a range from 0.01 to 2 mmol of alkali metal or zinc per gram of the silica. High melt index potential activated titanated chromium / silica catalysts can be used to polymerize olefins to produce, for example, ethylene based homopolymers and copolymers having HLMI values of greater than 30 g / 10 min.

The invention discloses a preparation method of a high-selectivity and high-strength methanol synthesis catalyst, and belongs to the technical field of catalysts. The method adopts a three-step precipitation method to prepare a catalyst precursor, specifically, after zirconium and aluminum form a precipitate 1 together, zinc continues to precipitate on the basis of the precipitate 1 to form a precipitate 2, and finally copper, zinc and aluminum continue to precipitate on the basis of the precipitate 2. The finally prepared methanol synthesis catalyst has excellent selectivity and strength while having low-temperature activity and stability. The methanol synthesis catalyst prepared by the method can be widely applied to methanol synthesis devices with annual output of 600,000 tons and above.

The invention discloses a preparation method of a photocatalytic ferroelectric heterojunction with a photothermal-pyroelectric effect, which comprises the following steps: step 1, preparing carboxylated BaTiO3 nanoparticles (BaTiO3NPs), adding a carboxylic acid modified ferroelectric material and a metal salt solution into a mixed solution of H2O and ethanol, and stirring to obtain a mixed solution; wherein the ferroelectric material is BaTiO3NPs, and the metal salt is In (NO3) 3.4 H2O; 2, adding a mixed solution of ammonia water and an ethanol solution into the mixed solution, reacting in an oil bath at 80 DEG C for 30 minutes, carrying out centrifugal washing and drying to obtain BaTiO3 / In (OH) 3, and carrying out high-temperature calcination in a muffle furnace to obtain a BaTiO3 / In2O3 heterojunction; and step 3, grinding the obtained BaTiO3 / In2O3 and NaBH4 according to a ratio, uniformly mixing the obtained BaTiO3 / In2O3 and NaBH4, and roasting the obtained mixture in a tubular furnace in an argon atmosphere to obtain the black BaTiO3 / B-In2O3 heterojunction. A semiconductor material with photo-thermal conversion performance is combined with a pyroelectric material, so that the prepared heterojunction has relatively high photocatalytic reduction activity, and the catalytic efficiency is improved.

The present invention discloses a pretreatment method and application of an alumina-supported copper oxide-rare earth metal oxide catalyst. The pretreatment method is as follows: adding the alumina-supported copper oxide-rare earth metal oxide catalyst used for the reaction of ethanol to higher alcohols into a mixture of one or several C1-C8 alcohols, impregnating at 10-90 °C for 1-24 h, filtering to remove the excess alcohol after impregnation is completed, and then drying in an oven at 40-200 °C for 1-24 h to complete the pretreatment of the catalyst. The present invention provides the application of the alumina-supported copper oxide-rare earth metal oxide catalyst pretreated by the pretreatment method in the reaction of ethanol to higher alcohols. The pretreatment method of the present invention significantly increases the selectivity of the product higher alcohols and keeps the conversion rate of ethanol unchanged or slightly improved, thus solving the problem that it is difficult to balance both the conversion rate and selectivity in the prior art.

The invention provides a non-noble metal heterogeneous catalyst as well as a preparation method and application thereof, and relates to the technical field of catalysts. The non-noble metal heterogeneous catalyst provided by the invention comprises an indium-zinc bimetallic oxide and an aluminum element doped in the indium-zinc bimetallic oxide. The non-noble metal heterogeneous catalyst (InZnAlOx catalyst) provided by the invention shows excellent catalytic activity and catalytic stability in preparation of N, N-dimethylformamide by reaction of carbon dioxide, hydrogen and dimethylamine. The result of the embodiment shows that compared with an InZnOx catalyst, when the InZnAlOx catalyst provided by the invention is used for preparing N, N-dimethylformamide through reaction of carbon dioxide, hydrogen and dimethylamine, the yield of N, N-dimethylformamide is high, and the InZnAlOx catalyst has excellent stability.

The invention provides a catalyst for preparing methanol through carbon dioxide hydrogenation and a preparation method of the catalyst. The catalyst is prepared from an active component and an auxiliary agent and / or a modifier, the active component is CuO or In2O3; the auxiliary agent is one or more of ZnO (zinc oxide), ZrO2 (zirconium oxide) and Al2O3 (aluminum oxide); and the modifying agent is one or more of La2O3, Y2O3 and CeO2. The catalyst is prepared by adopting a single-step coprecipitation method, the preparation process is greatly simplified, the preparation cost is greatly reduced, the large-scale production potential is achieved, the CO2 catalytic efficiency can be improved by 1-5%, and the methanol yield can be improved by 1-10%. The composition of the catalyst can be flexibly regulated and controlled, various catalysts with excellent performance can be obtained, and the most suitable catalyst can be conveniently selected according to the working condition environment in actual production.

The invention provides a nanometer casting and doping double-strategy improved lanthanum manganese perovskite catalyst, a preparation method thereof and application of the nanometer casting and doping double-strategy improved lanthanum manganese perovskite catalyst in degradation of halogenated organic pollutants. The preparation method of the nanometer casting and doping double-strategy improved lanthanum manganese perovskite catalyst comprises the following steps: taking transition metal salt as a doping agent, and mixing transition metal salt, lanthanum salt, manganese salt and a complexing agent in a solvent to form a mixed solution; then adding nano silicon dioxide, stirring and heating to a gel state, and drying to obtain a solid precursor; calcining the solid precursor to obtain a calcined product which comprises nano silicon dioxide and transition metal doped lanthanum manganese perovskite; and adding the calcined product into an alkaline solution, and etching to remove the nano silicon dioxide to form a nano pore channel structure so as to prepare the nano casting and doping double-strategy improved lanthanum manganese perovskite catalyst. The nano casting and doping double strategies have a synergistic improvement effect on lanthanum manganese perovskite, and the catalytic performance of the obtained catalyst is remarkably superior to that of a single-strategy improved catalyst.

A catalyst and methods for making the catalyst are provided. An exemplary catalyst includes the formula: MoaVbTec-TadOx. In this formula, a is 1.0, b is about 0.01 to about 0.3, c is about 0.01 to about 0.09, d is about 0.01 to about 0.05, and x is the number of oxygen atoms necessary to render the catalyst electronically neutral.