Iron-molybdenum catalyst for preparing formaldehyde through methanol oxidation, preparation and application of iron-molybdenum catalyst

Abstract

The invention relates to a preparation method of an iron-molybdenum catalyst for preparing formaldehyde through methanol oxidation. The preparation method of the iron-molybdenum catalyst comprises the following steps: by taking ammonium molybdate and iron ore as raw materials, firstly, mechanically crushing the iron ore, and then roasting; adding ammonium molybdate into the roasted iron ore according to different molybdenum-iron atomic ratios, and carrying out solid-state grinding and uniform mixing; adding deionized water and inorganic acid at a certain temperature for acidification treatment to obtain mixed slurry of iron molybdate and molybdic acid; carrying out aging treatment on the obtained slurry, and then filtering and separating to obtain a filter cake; and drying, crushing, forming and roasting the filter cake to obtain the iron-molybdenum catalyst for preparing formaldehyde by methanol oxidation. In the preparation process, iron salts such as ferric nitrate and the like are replaced by the iron ore so as to reduce the raw material cost of the iron-molybdenum catalyst, and the mixing uniformity of molybdenum oxide and iron molybdate components is improved on the microscopic scale so as to prolong the service life of the iron-molybdenum catalyst.

Description

technical field [0001] The invention belongs to the field of preparation of novel catalytic materials, and in particular relates to a long-life methanol oxidation to formaldehyde iron-molybdenum catalyst (MoO 3 -Fe 2 (MoO 4 ) 3 ) preparation method. Background technique [0002] As a basic chemical product, formaldehyde has a very wide range of applications. In recent years, my country's methanol production has leapt to the first place in the world. Among the existing domestic formaldehyde production processes, the methanol oxidation process is the main one. 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 single-set production capacity, small methanol unit consumption, and long service life of the catalyst. Therefore, in recent years, most of the new and expanded formaldehyde plants adopt the iron-molybd...

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Problems solved by technology

CN108816241 A, CN100413584C, CN108435192 A, US4420421, US 4829042 etc. have carried out the preparation of iron-molybdenum catalyst by co-precipitation method, although can make the iron-molybdenum catalyst that activity is good enough, strength also meets the requirements for methanol oxidation to formaldehyde, but However, there are problems such as high catalyst preparation cost and easy deactivation of the catalyst, which limit its further industrial application.

[0004] To sum up, the existing iron-molybdenum-based catalysts for methanol oxidation to formaldehyde are mostly prepared by coprecipitation method, usually the preparation process is cumbersome, and the mixing uniformity of molybdenum oxide and iron molybdate components is not enough, which leads to the easy deactivation of the catalyst

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