Process for preparing nano silver zeolite film catalyst for 1,2-propylene glycol gas phase dehydrogenation and oxidation to synthesize pyruvic aldehyde

Abstract

The present invention belongs to the field of chemical technology, and is especially one kind of nano silver zeolite film catalyst for gas phase dehydrogenation and oxidation of 1, 2-propylene glycol to synthesize pyruvic aldehyde and its preparation process. The catalyst has nanometer electrolytic silver particle carried onto metal net coated with superthin zeolite film, and is prepared through lamination electrolysis process to deposite electrolytic silver onto zeolite film. The catalyst has low temperature catalytic effect superior to traditional electrolytic silver catalyst and features the continuous catalytic dehydrogenation in the conversion rate up to 96.1 % and selectivity up to 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...

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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.