Catalyst for direct preparation of styrene by catalyzing acetylene and its preparation method and application

Abstract

The invention relates to the technical field of catalysts, and specifically discloses a catalyst for directly preparing styrene by catalyzing acetylene, a preparation method and application thereof. The catalyst is a molecular sieve modified by metal and metal oxide, and the metal (niobium, molybdenum, tungsten, zirconium) oxide component of the modified acid site and the metal (palladium, platinum , ruthenium) components are impregnated step by step and confined in the pores of the molecular sieve, the amount of B acid and L acid in the molecular sieve is adjusted by the metal oxide to change the catalytic effect, and at the same time, highly dispersed metal sites are introduced to activate the reactant molecules and stabilize the intermediate species. , to improve catalyst performance. The present invention breaks the traditional technical route of styrene, broadens the downstream products of coal-based acetylene, and synthesizes styrene through the direct reaction of acetylene and benzene under the action of the catalyst. The reaction conditions are mild. Compared with the traditional technical route of styrene, the process route is Short, low energy consumption, obvious technical advantages.

Description

Catalyst for directly preparing styrene from acetylene and its preparation method and application technical field The present invention relates to catalyst technical field, specifically, relate to a kind of catalyst for directly preparing styrene by catalyzing acetylene Chemical agent and preparation method and application thereof. Background technique Styrene, as an important chemical basic raw material, is mainly used in synthetic rubber and resin, and its downstream products mainly include Styrene-butadiene rubber, polystyrene resin, ABS engineering plastics and other products are widely used in industrial applications and are in high demand. At present, styrene is basically Since petrochemical technology, nearly 90% of the production capacity is mainly through ethylbenzene dehydrogenation technology, and its process route first passes through benzene and ethylene The production of ethylbenzene, and then the production of styrene by dehydrogenation of ethylbenzen...

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Problems solved by technology

At present, the main downstream product of acetylene, polyvinyl chloride (PVC), has a serious overcapacity and low industrial profits. It is urgent to expand the industrial chain of downstream products of acetylene.

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