Large-aperture mesoporous molecular sieve catalyst, and preparation method and application thereof

Abstract

The invention discloses a large-aperture mesoporous molecular sieve catalyst, and a preparation method and application thereof. The large-aperture mesoporous molecular sieve catalyst contains an FDU-12 molecular sieve and WO3, wherein at least partial WO3 is uniformly distributed in a framework of the FDU-12 molecular sieve. Preferably, the large-aperture mesoporous molecular sieve catalyst contains 1-15 percent of WO3, the specific surface area of the large-aperture mesoporous molecular sieve catalyst is 500-800m<2> / g, and the average pore diameter of each pore is 17nm-19nm. The preparation method comprises the following steps: fully reacting a template agent, a silicon source, an inorganic salt assistant, a dispersing agent and a tungsten source in an acidic water solution at a temperature of 10 DEG C-50 DEG C, and then crystallizing at a temperature of 50 DEG C-200 DEG C to form a product, wherein the template agent comprises a polyethylene glycol-polypropylene glycol-polyethylene glycol triblock polymer. The large-aperture mesoporous molecular sieve catalyst disclosed by the invention is relatively large in mesoporous diameter and specific surface area, catalytic active ingredients of the catalyst are good in dispersing property and large in dispersing capacity, and the catalyst is high in catalytic activity and also has the advantages of high raw material conversion rate, high product yield, good selectivity and the like when applied to an olefin disproportionation reaction.

Description

technical field [0001] The present invention relates to a molecular sieve catalyst, in particular to a large-aperture mesoporous molecular sieve catalyst WO 3 / FDU-12 and a preparation method thereof belong to the field of catalyst synthesis. Background technique [0002] Olefin disproportionation is a catalytic reaction in which one or two olefins are converted into new olefins through the cleavage and regeneration of olefin carbon-carbon double bonds. The disproportionation of olefins can be expressed by the following formula: [0003] [0004] In the formula, R1, R2, R3, R4 are hydrogen or alkyl substituents. Olefin disproportionation is often used to convert relatively surplus, low-value-added olefins into high-value olefin products, for example, ethylene and butene can be cross-disproportionated to produce propylene. [0005] The key to the olefin disproportionation reaction is the catalyst, which can be a homogeneous catalyst or a heterogeneous catalyst. The het...

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Problems solved by technology

However, the pore size of commonly used mesoporous materials is mostly below 10nm, and the loading capacity is limited, which directly affects its catalytic performance.

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