Catalyst for preparing methylacrolein through oxidation of isobutene and preparation and application of catalyst

Abstract

The invention relates to a preparation method of a catalyst for preparing methylacrolein through oxidation of isobutene. The preparation method comprises the following steps: fully mixing a precursor solution of molybdenum, bismuth, cobalt, nickel, iron, manganese and alkaline metal with a carrier 1 to form slurry, fully mixing the obtained mixed slurry with a carrier 2, and roasting to obtain a core-shell morphology catalyst. The catalyst with the morphology solves the technical problems of local overheating of the catalyst, sublimation loss of the active component Mo and deep oxidation in the oxidation process, and meanwhile, the catalyst with the morphology 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