Method for preparing regular mesoporous nickel based methanation catalyst

Abstract

The invention relates to a method for preparing a regular mesoporous nickel based methanation catalyst. The method comprises the following steps: by taking titanium dioxide and aluminum oxide as a composite carrier, taking nickel oxide as an active ingredient, taking nickel acetate as a nickel source, taking dibutyl phthalate and aluminum isopropoxide as raw materials of the composite carrier, andtaking a block polyether F-127 and a polyoxyethylene-polyoxypropylene-polyoxyethylene triblock copolymer P123 as a composite template agent, preparing uniformly dispersed sol-gel by hydrolysis, aging, and sintering, thereby obtaining the nickel based methanation catalyst with a mesoporous structure. The product is powdered granules and is mixed with raw gas so as to realize rapid methanation, regular mesopores can increase the dispersity and improve heat stability of the catalyst, and the product can effectively resist condensation accumulation in a high-temperature environment produced in the rapid reaction process. The preparation method is easy to operate, simple and rapid in process, reasonable in material ratio, detailed and accurate in data and excellent in product stability and anti-caking property and is a very ideal preparation method of the regular mesoporous nickel based methanation catalyst.

Description

technical field [0001] The invention discloses a method for preparing a regular mesoporous nickel-based methanation catalyst, belonging to the technical field of preparation and application of coal-to-natural gas catalysts. Background technique [0002] my country is a country rich in coal, poor in oil, and low in gas. Coal-based natural gas not only has good economic benefits in the era of high oil prices, but also has great significance for maintaining my country's energy security and environmental protection. The methanation process is an important step in coal-to-natural gas, and the development of efficient methanation catalysts is a key link. [0003] Currently domestic methanation catalysts use Al 2 o 3 As the main carrier, but due to the limitations of the carrier itself in application, it is not easy to adjust the performance of the catalyst, and the overall effect is not good, while TiO 2 As a transition metal oxide, it has the properties of an N-type semiconduc...

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Problems solved by technology

[0003] Currently domestic methanation catalysts use Al 2 o 3 As the main carrier, but due to the limitations of the carrier itself in application, it is not easy to adjust the performance of the catalyst, and the overall effect is not good, while TiO 2 As a transition metal oxide, it has the properties of an N-type semiconductor, which can produce a stronger electronic interaction with the metal supported on its surface, and affect the adsorption and catalytic performance of the catalyst, but TiO 2 The strength of the carrier is not high, the pore volume is small, and the specific surface area is generally less than 50m 2 / g, cannot well disperse the active metal to meet the requirements of the catalyst, and the anatase phase TiO at high temperature 2 Unstable, easy to transform into rutile phase, these all limit TiO 2 Applications as Catalyst Supports

single A1 2 o 3 The carrier has high specific surface area, high strength, and excellent thermal stability, but its activity and toxicity resistance need to be improved. A single TiO 2 High carrier activity, good low-temperature activity, strong anti-poisoning, but weak strength, low specific surface area, small pore volume, poor thermal stability, expensive finished products, etc.

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