Composite metal oxide catalyst for one-step preparation of isobutyl isobutyrate from isobutyraldehyde, and preparation method of composite metal oxide catalyst

Abstract

The invention belongs to the technical field of catalysts, and particularly relates to a composite metal oxide catalyst for one-step preparation of isobutyl isobutyrate from isobutyraldehyde, and a preparation method of the composite metal oxide catalyst. According to the invention, carbon black is used as an inert matrix, a nanometer CuO-MxOy (wherein M is Ce, Cr or Ti) carrier with a mesoporousstructure is synthesized by combining a space synthesis method with a hydrothermal microwave method, and then aluminum isobutoxide is loaded on the surface of the carrier by utilizing a supercriticalfluid impregnation method to prepare the catalyst. The preparation method is simple; the catalyst has a good structure and a good surface distribution state; a mesoporous structure significantly improves the stability of the catalyst and prolongs the service life of the catalyst, so the catalyst has a higher specific surface area and can be used in a reaction for preparing isobutyl isobutyrate from isobutyraldehyde in one step; and the reaction activity of the catalyst and the selectivity of isobutyl isobutyrate are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a composite metal oxide catalyst for preparing isobutyl isobutyrate with isobutyraldehyde in one step and preparation thereof. Background technique [0002] Isobutyl isobutyrate (IBIBE) is a kind of colorless or light yellow liquid with pineapple, grape skin or ether aroma, because it is basically harmless to humans and animals and will not cause environmental pollution, it is a good green Therefore, it is widely used as pineapple flavor in food, beverage and perfume industry, and at the same time, it is also an excellent organic solvent, dry paint remover, and additive for extraction and distillation. With the improvement of environmental protection requirements, the application of isobutyl isobutyrate is more and more extensive. Isobutyl isobutyrate is usually synthesized by isobutyric acid (IBAC) and isobutanol (IBOH) Fischer's esterification. This traditional m...

AI Technical Summary

Problems solved by technology

Aiming at the instability of the isobutoxyaluminum catalyst and its inactivation due to its own ligands being easily replaced by hydroxyl groups during the reaction process, the present invention synthesized a nanometer with a mesoporous structure through a space synthesis method combined with a hydrothermal microwave method. CuO-M x o y (M=Ce, Cr, Ti) carrier, and then use the supercritical fluid impregnation method to load aluminum isobutoxide on the surface of the carrier, so the catalyst has more active centers, strong adsorption and mass transfer capabilities, and significantly improves the catalytic performance of the catalyst. The stability and service life of the catalyst enable the catalyst to be used repeatedly

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