Acid-base bifunctional catalyst used for catalytic synthesis of methyl acrylate and preparation method thereof

Abstract

The invention relates to an acid-base bifunctional catalyst and a preparation method of the acid-base bifunctional catalyst. The catalyst comprises an active component and a carrier, wherein the active component is a basic metal oxide, and the carrier is aluminum oxide; and the catalyst also comprises an additive. The preparation method of the acid-base bifunctional catalyst comprises the following steps: impregnating activated carbon in a prepared active component precursor basic metal saline solution; and mixing and grinding the activated carbon impregnated with the basic metal saline solution and carrier precursor pseudo-boehmite, extruding into strips and molding, drying, and calcinating to prepare the catalyst. Al2O3 is used as the carrier and has weak acidity, so that the catalyst loaded with the active component has acid-base bifunction; the activated carbon is used as the early-stage additive, after calcining, the dispersivity of the basic center on the surface of the carrier is improved, the contact area between the basic center and the acidic center and reaction raw materials is increased, and the permeability of the catalyst is enhanced; a mechanical mixing method is adopted for preparation of the catalyst, so that the preparation process is simple, and the repeatability is good; and the additive is further added, so that the reaction selectivity and the yield are improved.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to an acid-base bifunctional catalyst for catalyzing the synthesis of methyl acrylate and a preparation method thereof. Background technique [0002] The method for synthesizing methyl acrylate with methyl acetate and formaldehyde or methylal as a raw material adopts an alkali catalyst or an acid-base bifunctional catalyst. It is an emerging process for preparing methyl acrylate in recent years. The raw materials of the process are cheap, less harmful to the environment, less reaction by-products, and have great development potential. [0003] Acid-base bifunctional catalysts have acidic centers and basic centers at the same time, which can improve the activity and selectivity of the reaction at the same time. Therefore, bifunctional catalysts with both acidic centers and basic centers are favored by people. [0004] The catalysts currently used in this reaction are m...

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Problems solved by technology

[0004] The catalysts currently used in this reaction are mainly based on SiO 2 Load active components for the carrier and add acidic modifiers, such as V / P catalysts and Cs-Sb by Jing Tao et al. 2 o 5 / SiO 2 Catalysts, these catalysts have good catalytic performance, but the preparation process is complicated and the repeatability is poor

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