A kind of preparation method of high dielectric composite microporous molecular sieve catalyst

Abstract

A preparation method of a high-dielectric composite microporous molecular sieve catalyst. First, silicon carbide foam ceramics are calcined; then tetrapropylammonium hydroxide, tetraethyl orthosilicate, sodium chloride, sodium aluminate, water, and mixed uniformly , Stir, stand still, and form a gel; mix the silicon carbide foam ceramics with the gel, put it into a reactor, place it in a microwave digestion apparatus, and treat it with microwaves; then clean it, transfer it to a muffle furnace for calcination, and then place it in a chlorination ammonium solution, and finally calcined in a muffle furnace to obtain a high dielectric composite microporous molecular sieve catalyst. The addition of the high-dielectric composite microporous molecular sieve catalyst of the present invention changes the temperature rise and catalytic behavior of the traditional catalyst in the reaction system, and effectively improves the catalytic efficiency of the catalyst. Microwave-assisted catalytic pyrolysis of biomass, non-edible oil and sludge can be widely used.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a preparation method and application of a high-dielectric composite microporous molecular sieve catalyst. Background technique [0002] Catalyst selection is very important in microwave rapid catalytic pyrolysis of biomass. In recent years, microporous, mesoporous, and macroporous catalysts (ZSM-5, MCM-41, FCC, LOSA-1, SBA-15, CNT, and modified derivatives of these catalysts) have been widely used to catalyze pyrolysis reactions, The research results show that microporous molecular sieves and mesoporous molecular sieves have better catalytic pyrolysis effects. Among them, ZSM-5 molecular sieve is the most widely used and effective catalyst at present, and has a good catalytic deoxygenation effect. It can catalytically crack the oxygen-containing substances in the primary pyrolysis steam to form hydrocarbons, while O 2 O, CO, CO 2 form removed. ZSM-5 molecular sieve has s...

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Problems solved by technology

The formation of coke will lead to blockage of the catalyst pores, restrict the diffusion of reactants into the catalyst pores, and cause the catalyst to lose its catalytic activity

(2) Microporous molecular sieves have a small pore radius, and it is difficult for macromolecular substances to enter effectively. Therefore, microporous molecular sieves are suitable for catalytic deoxidation of small molecular substances, resulting in more macromolecular substances in pyrolysis oil and easy aging