Molecular sieve catalyst and its preparation method and application

Abstract

The invention provides a molecular sieve catalyst and its preparation method and application. Described molecular sieve catalyst comprises: molecular sieve carrier, and its average particle size is 50-500nm, and described molecular sieve carrier has BEA structure; And active component, described active component is metal and / or metal oxide, the average particle size of described active component The diameter is 0.5-4nm; wherein based on the total mass of the active ingredients, at least 95% of the active ingredients are located inside the molecular sieve carrier. The molecular sieve catalyst of the present invention utilizes the regular channel and cage structure of the BEA structure molecular sieve to effectively increase the molecular mass transfer diffusion rate, thereby increasing the reaction rate of the catalytic reaction and improving the reactivity of the catalytic reaction; and its multiple active sites and The highly ordered dispersion of metal particles makes it an excellent catalytic material for catalytic cracking, catalytic oxidation, and isomerization.

Description

technical field [0001] The invention relates to a molecular sieve catalyst and its preparation method and use, in particular to a BEA structure molecular sieve catalyst packaged with metal oxide nanoparticles or metal nanoparticles, its preparation method and use, and belongs to the field of catalysts. Background technique [0002] Metal nanoparticles have high catalytic activity for hydrogenation (deoxygenation) reaction, oxidation reaction or reduction of nitrogen oxides and hydrocarbons. It is believed that when the metal particle size decreases, the catalytic activity increases, and when the nano-metal particle size is lower than 5nm, its catalytic activity is significantly enhanced. These very small-sized metal nanoparticles usually have a low average coordination number, and most of them are distributed at the corners and edges of the support, and participate in the catalytic reaction process after activation. However, the thermal stability of metal nanoparticles is r...

AI Technical Summary

Problems solved by technology

However, the thermal stability of metal nanoparticles is relatively low. Even if the metal particles are loaded on the carrier, they may still be sintered and agglomerated at high temperature, resulting in catalyst deactivation, which is one of the main reasons limiting its industrial application.

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