Preparation and application of coating catalyst using ionic liquid as binder

Abstract

The invention relates to a method of producing a coating catalyst and application thereof. The method of producing the coating catalyst comprises: applying catalyst powder with an active component to an inertial support under the action of ionic liquid, wherein the outer active component of the coating catalyst contains molybdenum oxide, bismuth oxide and other oxides, the inner active component is an inertial support such as aluminum oxide and silicon oxide. During preparation of the catalyst, it is possible to disperse the catalyst powder and ionic liquid jointly (or separately) in ethanol and is sprayed (simultaneously) to an inertial spherical support so as to obtain the coating catalyst. The catalyst forms pores of special distribution after being treated via drying and calcining and the like, has high mechanical strength, and has good reacting performance during acrolein production by propylene oxidation, (methyl) acrylic acid by (methyl) acrolein oxidation and methacrylaldehyde production by isobutylene.

Description

technical field [0001] The invention relates to the preparation and application of a coated catalyst using ionic liquid as a binder, and belongs to the field of catalyst preparation and application. Background technique [0002] The selective oxidation of olefins to prepare α, β unsaturated aldehydes and unsaturated acids is an important chemical process in industrial production. Typical reaction processes include propylene oxidation to acrolein, acrolein to acrylic acid, isobutylene to methacrolein and Oxidation of methacrolein to methacrylic acid. At present, the catalysts used in this type of reaction are mainly molybdenum and bismuth-based multi-component composite metal catalysts and heteropolyacid catalysts, among which the multi-component composite metal oxide catalysts include Mo-Bi-Fe-Co- O catalyst, Mo-V-Cu-O catalyst for acrolein oxidation to acrylic acid and Mo-Bi-Cs-Fe-O catalyst for isobutylene oxidation to methacrolein, heteropolyacid catalyst for methacrolei...

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Problems solved by technology

[0006] Patent document CN104525242A proposes a method for preparing a molecular sieve monolithic catalyst, which uses a coating method to prepare a molecular sieve coating catalyst, which improves the utilization rate of the catalyst, but the catalyst is easy to peel off and has poor mechanical strength; patent document CN0185995. The coating catalyst is prepared by coating the catalyst on an inert carrier, but the bonding operation is complicated and requires high requirements, and the mechanical strength of the prepared catalyst is low

[0007] The patent document CN104801351A utilizes a spraying method to prepare a coated catalyst, and adds a high molecular organic compound as a binder during the preparation process, which improves the mechanical strength of the catalyst and the utilization rate of the active component, but the high molecular organic compound used has a wide molecular weight, The wide carbonization temperature range makes it difficult for the coating catalyst to selectively form pores, and some residues will remain during the calcination process, which will affect the performance of the catalyst; in addition, the high molecular organic compound is easy to react with the catalyst slurry, which requires a lot of spraying equipment. high, complex operation