Preparation method of iron molybdenum based catalyst for preparing formaldehyde by methanol oxidation and application

Abstract

The invention relates to a preparation method of an iron molybdenum based catalyst for preparing formaldehyde by methanol oxidation and application. The method is characterized in that macromolecularheterocyclic compounds such as ferriporphyrin molybdenum porphyrin are treated as the raw materials and subjected to nano self-assembling to prepare nano structures with different appearance and sizeand regular and stable structures; the nano structures are thermally treated to obtain a series of iron molybdenum based catalysts for preparing formaldehyde by methanol oxidation; the size and appearance of the regular ferrum-molybdenum nano structures can be changed to realize the control of binary activity center spacing, ratio and distribution of ferrum and molybdenum, and thus the effective contact area of ferrum and molybdenum is increased. With the adoption of the catalyst, methyl alcohol can be efficiently converted under the condition that the pressure is normal pressure, the reactiontemperature is 230-420 DEG C, the volume content of input methyl alcohol is 1-15%, and the gas carrying airspeed is 3000-15000h<-1>. The preparation method is simple to operate, and easy to widely apply; the method is applicable to the fields such as methanol oxidation type formaldehyde preparation and has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of novel catalytic materials, in particular to a novel iron-molybdenum-based catalyst (MoO 3 -Fe 2 (MoO 4 ) 3 ) preparation method. Background technique [0002] As an important basic chemical product, formaldehyde is widely used in many fields such as chemical industry, materials, and medicine. In the existing industrial production of formaldehyde in my country, methanol oxidation is the main method. According to the type of catalyst used, it is divided into "silver method" and "iron molybdenum method". Compared with the "silver method", the "iron-molybdenum method" production device has the advantages of large production capacity, low methanol unit consumption, high-concentration formaldehyde production, and more environmentally friendly. Therefore, in recent years, most of the new and expanded formaldehyde plants around the world also use the iron-molybdenum production process. [0003] The ex...

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Problems solved by technology

However, the composition of this catalyst is relatively complex, and the preparation process is cumbersome, making it difficult to prepare on a large scale, which limits its further industrial application.

[0004] At present, the existing domestic iron-molybdenum method catalysts generally have short service life, and the active component Mo is easily sublimated and lost; secondly, the catalysts used in the domestic iron-molybdenum method process rely on foreign imports, and the development of advanced iron-molybdenum catalysts has become a key factor for the development of methanol production. The key to the formaldehyde industry

[0005] In summary, the existing iron-molybdenum-based catalysts for methanol oxidation to formaldehyde are mostly prepared by coprecipitation method, which cannot precisely control the two types of active sites.

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