Manganese dioxide composite material and preparation method and application thereof

Abstract

The invention provides a manganese dioxide composite material as well as a preparation method and application thereof. The manganese dioxide composite material is prepared by taking manganese dihydrogen phosphate, cerium trichloride, melamine, halloysite and the like as raw materials. The manganese dioxide composite material can be used for a reaction for preparing formaldehyde through methanol oxidation, and the methanol conversion rate and the formaldehyde yield are greatly improved. Preparation of formaldehyde by methanol oxidation belongs to dehydrooxidation, so that the key of promoting the reaction is how to promote hydrogen removal. In the preparation process, rich pores are formed in a precursor calcining process, so that the composite material has a good adsorption effect on methanol, good contact between the composite material and reactant methanol is promoted, and a good foundation is provided for subsequent catalytic reaction.

Description

technical field [0001] The invention relates to the technical field, in particular to a manganese dioxide composite material, a preparation method and an application. Background technique [0002] Formaldehyde is an important organic chemical raw material, one of the important derivatives of methanol, and a large-scale production and consumption of chemical products. The usual preparation method is: at 600-700°C, let methanol, air and water pass through catalysts such as silver, copper or alum pentoxide to directly oxidize formaldehyde, and absorb it with water to obtain formaldehyde solution. High-temperature reactions will undoubtedly bring huge energy and cost pressures. In order to reduce the reaction temperature, researchers have been working on the research of catalysts. [0003] Patent application CN108816241A discloses an iron-molybdenum method for methanol oxidation to formaldehyde catalyst, which uses molybdenum salt and iron salt as raw materials, and is first pr...

AI Technical Summary

Problems solved by technology

But, in order to obtain higher aldehyde, the catalyst consumption that ketone yield needs is very high, for example when producing benzaldehyde, the yield of γ crystal form manganese dioxide just can reach 100% when 8 equivalents, this catalyst consumption is quite astonishing and greatly increases the cost of production

Moreover, the oxidation object of this catalyst is allyl (benzyl) alcohol, and the applicant applied it to the reaction of oxidation of methanol into formaldehyde. The conversion rate of methanol and the yield of formaldehyde are far less than the ideal reaction effect involved in this patent.

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