A catalyst for preparing methacrolein by oxidation of isobutylene and its preparation and application

Abstract

A method for preparing methacrolein catalysts for the oxidation of isobutylene, using precursor solutions of molybdenum, bismuth, cobalt, nickel, iron, manganese and basic metals and carrier 1 to fully mix to form a slurry, and then mix the obtained The slurry and the carrier 2 are fully mixed and roasted to obtain a catalyst with a core-shell morphology. The catalyst with this morphology solves the technical problems of local overheating of the catalyst, sublimation loss of the active component Mo, and deep oxidation during the oxidation process. At the same time, the morphology The catalyst has good mechanical strength, good hydrothermal stability, high selectivity to products, and good industrial application value.

Description

technical field [0001] The present invention relates to a preparation method for the preparation of methacrolein catalyst for the oxidation of isobutene, in particular to the method of fully mixing the precursor solution of molybdenum, bismuth, cobalt, nickel, iron, manganese and basic metal with the carrier 1 to form a slurry , and then fully mixed the obtained mixed slurry with the carrier 2 and then roasted to obtain a catalyst with a core-shell morphology. Background technique [0002] Methacrolein (MAL) is an important intermediate for the synthesis of methacrylic acid (MAA) and methyl methacrylate (MMA), and is also an important fine chemical intermediate for the synthesis of pharmaceuticals and pesticides. Isobutene oxidation to MAL is a key step in the preparation of MAA and MMA (referred to as isobutene oxidation). Compared with the traditional ACH method, the isobutene oxidation method for the preparation of MAA has better technical and economical efficiency. This ...

AI Technical Summary

Problems solved by technology

[0004] At present, the catalyst for the reaction of isobutene oxidation to methacrolein is mainly Mo-Bi-Fe-Co composite oxide catalyst. This composite metal catalyst has two problems that are difficult to overcome. One is that the oxidation of isobutene to methacrolein is an exothermic process. reaction, the traditional Mo-Bi-Fe-Co composite oxide catalyst has a small specific surface area of ​​3-20m 3 / g, the specific surface of the catalyst is small and the active components are too concentrated, which will easily lead to local overheating of the catalyst during reaction, which will lead to the sublimation loss of the active component Mo in the catalyst, resulting in a decrease in catalyst activity and selectivity