32results about How to "Increase the number of active centers" patented technology

Sulfur transfer catalyst comprises spinel compound contained with alkaline-earth metal and aluminum, or contained rare earth metal except cerium, or without vanadium; and oxide with adding metal component of cerium oxide and zinc oxide; based on catalyst, the weight share is spinel compound 50-90%, cerium oxide and zinc oxide 10-50%; the average particle diameter of cerium oxide and zinc oxide is less separately 130A and 300A with XRD method. It can decrease the reproduced SOx with high active in FCC and sulfur content in gas outcome.

A cracking method for alkymer containing S includes contacting the alkymer containing S with a catalyst mixture with a cracking catalyst and a sulfurtransfer catalyst to recover the cracked products, among which, the sulfurtransfer catalyst contains spinel composition with alkali earth, Al and additional metal oxide and the spinel contains alkal: earth, Al, rare earth metal and or not except Ce, said additional metal component oxide is CeO and ZnO, the content of the spinel is 50-90weight%, the content of CeO AND ZnO is 10-50weight% with a catalyst as the primary standard. The mean particle diameter of CeO is less than 130A measured by XRD method and that of ZnO is less than 300A.

The invention relates to a preparation method of a nanometer nickel-based catalyst applied to carbon monoxide methanation reaction of a slurry reactor. The method comprises the steps of 1, completely dissolving 4-10 parts of nickel salt precursor and 0.5-2 parts of auxiliary salt precursor into enough carbon source precursor solution; 2, adding 5 parts of silicon dioxide carriers into the solution under the condition of stirring, and then ultrasonically immersing, thus allowing the nickel salt precursor, the auxiliary salt precursor and the carbon source precursor to be uniformly dispersed on the silicon dioxide carriers; 3, vacuum drying acquired impregnation liquid, roasting in an inert atmosphere, then roasting in the air atmosphere, grinding acquired samples, and sieving to acquire a catalyst precursor; and 4, recovering the catalyst precursor at high temperature to acquire the nanometer nickel-based CO methanation catalyst. The preparation method provided by the invention has the advantages of short technological process, simple operation, low cost, being prone to achieve large-scale industrial production.

The invention discloses a method for preparing a catalyst carrier. In the method, white carbon black, a binder, a surfactant and / or silicon carbide are uniformly mixed, extruded, and then dried and calcined to obtain a catalyst carrier; the invention Also disclosed is an application of a catalyst carrier, wherein the catalyst precursor is loaded onto the catalyst carrier by an impregnation method to prepare a catalyst for dehydration of N-hydroxyethylpyrrolidone to synthesize N-vinylpyrrolidone. The present invention introduces surfactant and / or silicon carbide into the preparation raw material of the catalyst carrier, which promotes the uniform dispersion of white carbon black, avoids the agglomeration of hydroxyl groups, reduces the activity loss of the catalyst, and improves the mechanical strength of the carrier at the same time; The catalyst carrier is applied to the preparation of N-hydroxyethylpyrrolidone dehydration synthesis N-vinylpyrrolidone catalyst, which increases the number of active centers of the catalyst and reduces the activity decline of the catalyst after molding.

The invention relates to a loaded type nickel-based catalyst used for slurry bed methanation, and a preparation method and an application thereof. The loaded type nickel-based catalyst is composed of, by weight, 10-40 wt% of NiO, 56-90 wt% of a carrier and 0-4 wt% of an auxiliary agent. The loaded type nickel-based catalyst is prepared by the steps of preparing a soluble salt solution of 0.5-1.3 g / mL nicdel nitrate and the auxiliary agent; adding a catalyst carrier and a soluble organic fuel to the salt solution in sequence; impregnating for 6-24 h while stirring; heating the solution for concentration in a water bath with a temperature of 60-90 DEG C after finishing the impregnation, or heating for igniting the solution at a temperature of 300-700 DEG C directly; collecting the combustion residue powder, grinding the powder and granulating, and reducing for 2-6 h with a reducing gas on a fixed bed at a temperature of 500-700 DEG C. The loaded type nickel-based catalyst has a slurry bed methanation process, and has the advantages of good and stable catalytic performance, and can be used for large-scale industrialization.

The invention belongs to the field of biomass energy utilization and particularly relates to a method for cracking biomass pyrolytic tar catalytically using a nickel-carrying carbon nano tube. The method includes: obtaining nickel-based catalyst based on a carbon nano tube carrier by utilizing the carbon nano tube as a carrier and elementary-substance nickel as active component, and allowing for high-efficiency catalytic cracking of the biomass pyrolytic tar using the nickel-based catalyst, wherein the elementary-substance is in mass percentage of 0.5-30% in the composite catalyst. Specific surface area of the catalyst is enlarged greatly by utilizing the carbon nano tube as the carrier, order pore passage structure suitable for cracking reaction of macromolecule organic matters in tar is provided, and combustible gas with tar content smaller than or equal to 1% can be obtained after catalytic cracking of the biomass pyrolytic tar.

The invention relates to a preparation method of a loaded type palladium-alumina catalyst, wherein the preparation method includes the steps: mixing a precursor salt solution of an alkaline earth metal oxide, a hexamethylenetetramine solution and an aluminum sol to prepare a premixed liquid; granulating the premixed liquid through an oil-column shaping method to obtain aluminum gel balls; aging and washing the aluminum gel balls, drying for 4 hours at the temperature of 100-120 DEG C, treating for 2-3 hours at the temperature of 200-300 DEG C, treating for 3-4 hours at the temperature of 550 DEG C, and treating for 3-4 hours at the temperature of 960-1000 DEG C, to obtain an alumina carrier; impregnating the alumina carrier with a precursor salt solution of an alkali metal oxide, and then drying; and impregnating the dried alumina carrier with a metal palladium precursor solution, washing with water, drying, and roasting for 3-5 hours at the temperature of 450-550 DEG C in an air atmosphere, to obtain the loaded type palladium-alumina catalyst. The prepared loaded type palladium-alumina catalyst has higher catalytic activity and selectivity in the premise of ensuring good catalytic life.

An anti-carbon synthesis gas methanation catalyst takes 55-85 percent by weight of gama-Al2O3 as a carrier, 10-40 percent by weight of Ni as an active component, and 1-7 percent by weight of one of Mo, Co, La and Ce as an additive.. The anti-carbon synthesis gas methanation catalyst disclosed by the invention has the advantages of high catalytic activity, high heat stability, strong anti-carbon capability and long catalyst service life.

The invention discloses a precious metal methanation catalyst prepared by using a solution combustion method, which comprises the following components in percentage by weight: 1-10% of precious metal oxides and 90-99% of a carrier. The precious metal methanation catalyst disclosed by the invention has the advantages that the catalyst is applicable to a trace CO methanation process, and stable in catalytic performance.

The invention belongs to the field of utilization of catalyst and biomass energy and particularly relates to a nickel-based tar reforming catalyst based on a mesoporous zirconia carrier and a preparation method thereof. The nickel-based tar reforming catalyst based on a mesoporous zirconia carrier utilizes mesoporous zirconia molecular sieves as carriers and utilizes nickel oxide as an active component, and is a composite catalyst which comprises 70%-99.5% by mass of mesoporous zirconia molecular sieves and 0.5%-30% by mass of nickel oxide. Since the mesoporous zirconia molecular sieves are used as the carriers, the specific surface area of the catalyst is expanded greatly, and an order channel structure suitable for cracking reaction of macromolecular organic matter in tar is provided. By means of interaction between the mesoporous zirconia molecular sieves and the nickel oxide, reactivity of the catalyst is improved, and the catalytic reforming rate to tar can be over 99%.