Process for preparing nano silver zeolite film catalyst for 1,2-propylene glycol gas phase dehydrogenation

Abstract

The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a method for preparing a nano-silver zeolite membrane catalyst used for synthesizing aceguvaldehyde by gas-phase dehydrogenation and oxidation of 1,2-propanediol. The catalyst of the present invention is to load electrolytic silver nanoparticles on a metal net coated with an ultra-thin zeolite membrane. The preparation of the catalyst adopts a layer-by-layer-electrolysis method, and silver is deposited on the zeolite membrane by electrolysis. The low-temperature catalytic effect of the catalyst is better than that of the traditional one. The electrolytic silver catalyst is a method for preparing aceglyoxal from 1,2-propanediol through gas-phase dehydrogenation in the presence of a nano-silver zeolite membrane catalyst in which the active component silver nanoparticles are uniformly dispersed. The catalyst is characterized in that the catalytic dehydrogenation is carried out continuously, the 1,2-propanediol gas phase dehydrogenation is completed in one step, the reaction temperature is low, the process is simple, the conversion rate of the catalytic dehydrogenation can reach 95.1%, and the selectivity can reach 75.6%.

Description

technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a preparation method of a nano-silver zeolite membrane catalyst used for synthesizing aceguvaldehyde by gas-phase dehydrogenation and oxidation of 1,2-propanediol. Background technique [0002] Methylglyoxal (also known as methylglyoxal) is an intermediate in the synthesis of pyruvate and calcium pyruvate, and is widely used in the field of biochemistry. [0003] The traditional manufacturing process of methylglyoxal uses 1,2-propanediol as a raw material, electrolytic silver as a catalyst, and gas-phase dehydrogenation to produce methylglyoxal. The problem with this method is that it requires a higher reaction temperature. Generally speaking, the reaction temperature needs to be above 500°C in order to achieve a higher yield. At the same time, the electrolytic silver catalyst is easy to agglomerate at high temperature, which will lead to ca...

AI Technical Summary

Problems solved by technology

The problem with this method is that it requires a higher reaction temperature. Generally speaking, the reaction temperature needs to be above 500°C in order to achieve a higher yield. At the same time, the electrolytic silver catalyst is easy to agglomerate at high temperature, which will lead to catalyst failure. The activity dropped sharply, the pressure of the reaction bed increased, and finally the production had to be stopped

Moreover, at high temperature, the raw material is easily broken and deeply oxidized, and the surface of the catalyst is also prone to carbon deposition.