Methanation catalyst taking rutile type TiO2 as carrier and preparation method of methanation catalyst

Abstract

The invention relates to a methanation catalyst taking rutile type TiO2 as a carrier and a preparation method of the methanation catalyst and relates to methanation catalysts. The methanation catalysttaking the rutile type TiO2 as the carrier is prepared from the ingredients in percentage by mass: 2% to 16% of nickel oxide, 75% to 90% of titanium dioxide, 2% to 10% of rare-earth metal oxide and the balance of aluminum oxide. The preparation method comprises the steps: putting pseudo-boehmite and diluted acid into a kneader to prepare an aluminum sol composite binder, then, adding the rutile type TiO2 powder, carrying out kneading to obtain plastic mass, then, carrying out strip extruding forming, carrying out standing, carrying out baking, and carrying out roasting, so as to obtain the rutile type TiO2 carrier; preparing a complexing solution from a soluble nickel salt, a rare-earth metal soluble salt, ammonia water and citric acid, dipping the formed TiO2 carrier; after dipping, carrying out room-temperature standing, and carrying out baking; carrying out heat treatment: subjecting the dipped catalyst to programmed heating roasting, subjecting the nickel salt and the rare-earth metal salt to pyrolysis to obtain oxidation states, thereby obtaining the methanation catalyst taking the rutile type TiO2 as the carrier.

Description

technical field [0001] The invention relates to a methanation catalyst, in particular to a rutile-type TiO mainly used for the low-temperature methanation of a small amount of CO in crude hydrogen 2 Carrier-based methanation catalyst and its preparation method. Background technique [0002] Methanation technology is widely used, not only in the methanation reaction of CO in coal pyrolysis gas, coke oven gas, and biomass pyrolysis, but also in industries such as ammonia synthesis and fuel cells to remove H-rich 2 A small amount of CO in the system to prevent catalyst poisoning. Generally speaking, the CO content in the hydrogen gas is required to be lower than 10ppm in the chemical process, and the CO content is required to be lower in the fuel cell. The hydrogen refining process generally uses a catalytic methanation method to reduce the CO in crude hydrogen to an appropriate range. [0003] At present, the research on methanation reaction catalysts mainly focuses on oxid...

AI Technical Summary

Problems solved by technology

However, due to the disadvantages of small specific surface area, low strength and high cost of titanium dioxide, it is difficult to apply it in industry

Chinese patent CN102091631A discloses a catalyst with alumina-magnesia-titanium oxide as the carrier, cerium oxide as the auxiliary agent, and nickel as the active component. The catalyst is used in the field of coal-to-natural gas and has high activity and thermal stability property; Chinese patent CN102302936A discloses a co-precipitation method to prepare a titanium-containing nickel-based catalyst, the disadvantage of which is that the catalyst preparation process is complicated and the specific surface area of ​​the catalyst is low; Chinese patent CN103157485A discloses a method using TiCl 4 with Al(NO 3 ) 3 Co-precipitation is a method for preparing a titanium-aluminum composite carrier, but the specific surface area of ​​the composite carrier is low, and it needs to be formed in the later stage, so the process is complicated; A mixture of silicon and titanium oxide is used as a carrier catalyst, which can meet the requirements of heat resistance and high temperature resistance in coal-based natural gas; It is a non-uniformly distributed catalyst with mechanical mixing as the carrier, nickel as the active component, magnesium oxide and lanthanum trioxide as auxiliary agents, and has good catalytic activity for low-temperature methanation

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