Preparation method of vanadium phosphorus oxide catalyst

Abstract

The invention relates to the technical field of industrial catalysis, and provides a preparation method of a vanadium phosphorus oxide catalyst. The method comprises the following steps: preparing a metal assistant-doped oxovanadium hydrogenphosphate hemihydrate catalyst precursor powder, wherein the metal assistant is at least one of Fe, Mo, Co, Ce, Zr, Nb, and Ni, and a molar ratio of the metal assistant to vanadium is 0.06 to 0.15; and mixing the catalyst precursor powder with a binder and an auxiliary material, and carrying out strip extrusion or tabletting molding to obtain the vanadium phosphorus oxide catalyst, wherein the binder is at least one of phosphoric acid, pyrophosphoric acid, trimethyl phosphate, triethyl phosphate, aluminum dihydrogen phosphate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, zinc phosphate, tricalcium phosphate, ammonium phosphate, ammonium pyrophosphate and ammonium hexametaphosphate, the auxiliary material is at least one of graphite, carbon nanotubes, graphene and carbon powder, and a mass ratio of the catalyst precursor powder to the binder to the auxiliary material is 100:(0.1-15):(0.1-10). The preparation method of vanadium phosphorus oxide catalyst is simple and has no special requirements of production devices, and the obtained catalyst has the advantages of high strength, good catalytic effect, and facilitation of industrial production and application.

Description

technical field [0001] The invention belongs to the field of chemical catalysis, and in particular relates to a preparation method of a vanadium phosphorus oxygen catalyst. Background technique [0002] Maleic anhydride (referred to as maleic anhydride) is an important organic chemical raw material, widely used in unsaturated resins, coatings, food, pesticides, medicine, textiles and other fields. The current mainstream production method is the n-butane oxidation method. Compared with the widely used benzene oxidation method, this method has the characteristics of low raw material cost, low toxicity, high atom economy, and the production process is more environmentally friendly. The benzene oxidation method is similar and can be directly modified on the original device. [0003] However, the vanadium phosphorus oxygen VPO catalyst used in this method is generally made of safflower powder, pseudoboehmite, starch, and water-soluble resin as binders, and is formed by extrusion...

AI Technical Summary

Problems solved by technology

[0004] 1. In order to achieve a better binding effect, more binders are added to the catalyst powder, which affects the content of catalyst active components;

[0005] 2. Part of the binder decomposes, burns or generates other impurities at high temperature (the reaction temperature is usually 380-450°C during the reaction), which affects the activity and selectivity of the catalyst;

[0006] 3. The strength of the catalyst is low and easy to break, which reduces the activity and selectivity of the catalyst, shortens the service life of the catalyst, and affects the quality of the product at the same time, which increases the difficulty of the subsequent absorption and refining process of the product