Micro-mesoporous structure beta-molecular sieve, Ni-based micro-mesoporous beta-molecular sieve catalyst and preparation method thereof

Abstract

The invention relates to a molecular sieve and a catalyst, in particular to a micro-mesoporous structure beta-molecular sieve, an Ni-based micro-mesoporous beta-molecular sieve catalyst and a preparation method thereof. The micro-mesoporous structure beta-molecular sieve solves the problems of narrow pore passage and small specific surface area of the existing microporous Beta molecular sieve andthe problems of diffusion limitation of an Ni-based molecular sieve catalyst. The method comprises the following steps of preparing a template agent C18-6-18Br2 through reaction between bromooctadecane and N,N,N',N'-tetramethyl-1,6-hexamethylene diamine according to the mol ratio of 2:1 in acetonitrile and toluol (1:1 v / v); then, performing hydro-thermal synthesis of the micro-mesoporous beta-molecular sieve by tetra-ethylalnmonium hydroxide water solution, the template agent and other chemical raw materials; next, loading nickel nitrate hexahydrate onto the molecular sieve to obtain the Ni-based micro-mesoporous beta-molecular sieve catalyst. The method has the advantages that the self made template agent is used for synthesizing the micro-mesoporous beta-molecular sieve; the cost is low;the synthesized micro-mesoporous beta-molecular sieve has good pore passage communication performance; by using the prepared Ni-based micro-mesoporous beta-molecular sieve catalyst, the ethanol conversion rate and hydrogen gas selectivity are obviously improved.

Description

technical field [0001] The invention relates to a molecular sieve and a catalyst, in particular to a micro-mesoporous Beta molecular sieve, a Ni-based micro-mesoporous Beta molecular sieve catalyst and a preparation method thereof. Background technique [0002] In recent years, coal, oil, natural gas and other non-renewable energy sources have been consumed in large quantities. Human beings are facing serious energy crises and environmental problems. Finding new alternative energy sources is an urgent problem to be solved. Hydrogen energy has attracted widespread attention due to its renewable, non-polluting combustion, and wide-ranging sources. Among them, indirect hydrogen production from biomass ethanol is considered to be the most economically feasible way. Therefore, the selection of suitable catalyst supports and transition metals with strong C-C bond and C-H bond breaking ability is the key to improve ethanol conversion and hydrogen selectivity. Beta molecular sieve...

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Problems solved by technology

[0004] The present invention solves the problems of single pore structure, small specific surface area, uneven distribution of catalyst active components and low catalytic efficiency in existing microporous Beta molecular sieves, and provides a micro-media with high crystallinity, large specific surface area and good pore connectivity. Porous Beta molecular sieve and its preparation method, its unique skeleton structure and excellent physical and chemical properties make it a strong force between the active component and the carrier when used as a carrier; at the same time, it provides a synthesized micro-mesoporous Beta molecular sieve As a carrier, using the equal volume impregnation method to load transition metal nickel, Ni-based micro-mesoporous Beta molecular sieve catalyst and its preparation method for the production of hydrogen from ethanol steam reforming, the conversion rate of ethanol and the selectivity of hydrogen are greatly improved

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