Preparation method and application of catalyst for synthesizing methyl methacrylate

Abstract

The invention discloses a preparation method of a catalyst for synthesizing methyl methacrylate. A ZSM-5 molecular sieves as a carrier, and an active center Au, and a transition metal and a lanthanidemetal are loaded on the molecular sieve; the prepared catalyst is good in catalytic effect, the conversion rate of methylacrolein is increased while the activity of the catalyst is improved, and theselectivity of methyl methacrylate is improved.

Description

technical field [0001] The invention belongs to the technical field of catalytic synthesis, and in particular relates to a preparation method and application of a catalyst for synthesizing methyl methacrylate. Background technique [0002] Methyl methacrylate (MMA) is widely used in national defense, construction and fine chemicals, such as the production of plexiglass, plastic modification, production of advanced coatings and adhesives, etc. Although the traditional acetone cyanohydrin method for producing MMA has a mature process, the price of raw materials is relatively high, and the use of highly toxic drugs and strong acids has caused serious problems such as environmental pollution and human poisoning. At present, there are many kinds of catalysts for producing MMA in the world, but they cannot satisfy high conversion rate and selectivity at the same time. Most of the catalysts use noble metal Pd as the active center, resulting in expensive catalysts and large investme...

AI Technical Summary

Problems solved by technology

Although the traditional acetone cyanohydrin method for producing MMA has a mature process, the price of raw materials is relatively high, and the use of highly toxic drugs and strong acids has caused serious problems such as environmental pollution and human poisoning.

At present, there are many kinds of catalysts for producing MMA in the world, but they cannot satisfy high conversion rate and selectivity at the same time. Most of the catalysts use noble metal Pd as the active center, resulting in expensive catalysts and large investment.

[0003] The catalysts used in the process of the current prior art are all carried out with oxides as the carrier, and the SiO used in the CN109395732 patent 2 -Al 2 o 3 As a carrier, the precursor of the oxide used in the preparation process is its nitrate, and nitric acid is introduced during the preparation process, which causes a large amount of NOx to be produced in the subsequent roasting process, consumes a lot of energy and is not environmentally friendly friendly, less economical

The reaction to produce MMA is a gas-liquid-solid three-phase reaction, and the catalyst will have friction during the reaction, which inevitably leads to loss of the catalyst, which in turn leads to a decrease in the activity of the catalyst; in addition, the polymerization of the reaction product MMA is also a main reason for the decrease in catalyst activity.

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