Preparation method of catalyst for alkane oxidation

Abstract

The invention discloses a catalyst for alkane oxidation, wherein the phosphorus-vanadium atom ratio is 1: (0.9-1.0), the phosphorus-molybdenum atom ratio is 1: (0.001-0.1), the phosphorus-aluminum atom ratio is 1: (0.9-1.1), and the phosphorus-oxygen atom ratio is 1: (7-10). A preparation method of the catalyst comprises the following steps: synthetizing a phosphorus-vanadium-oxygen precursor, synthetizing immobilized ammonium molybdate, synthetizing the catalyst, and activating the catalyst. The catalyst is used for preparing acetic acid through ethane oxidation, preparing crylic acid through dimethylmethane oxidation, and preparing fumaric acid and/or cis-butenedioic anhydride through butane oxidation. The preparation method has the advantages of simple technology, low production cost, nontoxicity, and low energy consumption and environment friendless during the production process.

Description

technical field [0001] The present invention relates to a catalyst preparation method, especially a catalyst preparation method that can be used for the oxidation of alkane, more specifically, it can be used for the oxidation of ethane, propane and butane to prepare acetic acid, acrylic acid, fumaric acid, maleic anhydride, etc. Catalyst preparation method. It belongs to the field of chemical product synthesis. Background technique [0002] As we all know, a large amount of low-carbon alkanes are produced in petroleum refining, most of which are used as fuel, and the waste of resources is serious. There are not many comprehensive utilization methods, and the catalyst life is short. Acetic acid and acrylic acid are industrial bulk raw materials, and maleic anhydride is an important raw material for preparing polyester, etc., with high economic value. [0003] In recent years, phosphorus vanadium series catalyst development is more, but all synthesis is more difficult, as: ...

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Problems solved by technology

[0003] In recent years, phosphorus vanadium series catalyst development is more, but all synthesis is more difficult, as: the catalyst preparation method of the fluidized-bed method n-butane oxidation of maleic anhydride of invention such as CN1059297A Tianjin University Xu Genhui and CN1090224A Montecatini company consultant In the n-butane oxidative maleic anhydride catalyst invented by Min et al., mixture alcohols such as butanol and benzyl alcohol are used to reduce the valence state of vanadium in the catalyst precursor containing phosphorus and vanadium, which makes it difficult to separate a large amount of aldehyde contained in the mixed alcohol, and the production cost is relatively high. high

The synthesis method and product separation method of the products in the above processes are either too complicated, or the reagents used are toxic, costly, or have problems such as large energy consumption and serious environmental pollution, which are not conducive to large-scale production.