Catalyst for catalyzing synthesis gas and benzene to prepare methylbenzene and xylene and preparation method thereof

Abstract

The invention discloses a catalyst for catalyzing synthesis gas and benzene to prepare methylbenzene and xylene and a preparation method thereof. The catalyst is composed of a bimetallic oxide and anHZSM-5 molecular sieve with a silica-alumina ratio of 10 to 100, wherein the bimetallic oxide is an AxOy-ZrO2 solid solution, A is Zn, Cd or Ga, the molar ratio of A to (A + Zr) is 0.01-0.4, and the amount of the AxOy-ZrO2 solid solution accounts for 10-60 wt% of the total amount of the catalyst. The catalyst has the beneficial effects that the catalyst is applied to the reaction of preparing methylbenzene and xylene through alkylation reaction of synthesis gas and benzene, and has high activity and high selectivity.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a catalyst for catalyzing synthesis gas and benzene to produce toluene and xylene and a preparation method thereof, belonging to the field of chemical technology. Background technique [0002] Light aromatics such as benzene, toluene, and xylene are important organic chemical raw materials, accounting for one-third of the market share in the petrochemical field. [0003] Today, about 70% of the global supply of benzene, toluene and xylene comes from naphtha cracking and reforming. [0004] Due to the increasing shortage of petroleum resources, some technologies for the production of benzene, toluene and xylene without naphtha as raw materials have gradually developed, such as: methanol to aromatics, benzene and methanol to produce toluene and xylene, toluene and methanol Alkylation of xylene and so on. Although these newly developed technologies no longer consume o...

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Problems solved by technology

[0008] Chinese patent CN104945219A adopts RuO 2 / ZSM zeolite, RbO 2 / Mordenite, PdO / Beta Molecular Sieve and Fe 2 o 3 / NbOPO 4 (SnOPO 4 ) etc. are used as catalysts for the alkylation reaction of synthesis gas and benzene to generate a certain amount of toluene and p-xylene, but the precious metals used are expensive and the conversion rate of benzene is low

[0010] (1) The conversion rate of benzene is low;

[0011] (2) The selectivity of xylene is low

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