Precursor of V-P-Si composite oxides catalyst for preparing maleic anhydride by oxidizing butane

Abstract

The present invention provides one kind of catalyst precursor for preparing cis-butenedioic anhydride via catalyzed butane oxidation. The catalyst precursor is prepared through reducing at least partially V+5 into V+4 and adding phosphoric acid and alkyl silicide successively. The catalyst precursor has relatively small porocity, relatively great bulk density and proper pore size distribution.

Description

technical field [0001] The invention relates to a catalyst for preparing maleic anhydride (abbreviated as maleic anhydride, commonly known as maleic anhydride). More specifically, the present invention relates to a kind of solid catalyst precursor that prepares maleic anhydride through catalytic oxidation of butane, particularly relate to the vanadium-phosphorus-silicon composite oxide fixed bed or fluidized bed solid catalyst precursor that prepares maleic anhydride . Background technique [0002] Maleic anhydride is an important organic chemical raw material, which is widely used in the production of thermosetting resins, unsaturated polyester resins, pesticides and fine chemical products. Previously, maleic anhydride was produced from benzene. Due to the toxicity, unsafety and environmental hazards of benzene, butene was used instead of benzene as raw material to produce maleic anhydride, and a device for producing maleic anhydride by catalytic oxidation of butene was e...

AI Technical Summary

Problems solved by technology

The composition of this catalyst is complex, but the catalytic activity and selectivity are not high

[0008] CN1303741A has described a kind of preparation method of the composite vanadium-phosphorus-oxygen catalyst of maleic anhydride by n-butane oxidation, and this method is to increase the available oxygen amount of catalyst system by adding oxygen storage body ceria-based composite oxide to VPO catalyst, The catalyst prepared by this method has complex components, and expensive rare earth oxides are added

[0012] As mentioned above, the catalyst for the production of maleic anhydride prepared by the preparation method in the prior art also has shortcomings such as the maleic anhydride yield and selectivity are not high, and the preparation process is long.