Catalyst for preparing crylic acid from propane through selective oxidation and preparation method thereof

Abstract

The invention relates to a compound metal oxide type catalyst for preparing crylic acid from propane through selective oxidation and a preparation method thereof. The general formula of the catalyst is MoVTeNbO, wherein Mo, V, Te and Nb are active ingredients, and an atomic molar ratio of the four metal elements and oxygen thereof is 1:(0.1-1.0):(0.2-1.0):(0.2-0.9):(20-60). When the catalyst is adopted for preparing the crylic acid, the conversion rate of the propane and the once through yield of the crylic acid are high, and a template synthesis method for preparing the compound metal oxide type catalyst with a periodically arranged ordered structure from the propane through selective oxidation is provided; and the catalyst prepared by the method has good controllability, the size, appearance, structure, arrangement and the like of the compound catalyst material can be controlled by the space limiting effect of the catalyst and the debugging effect of a template agent, and the catalyst has small particles and high catalytic activity.

Description

technical field [0001] The invention relates to a composite metal oxide catalyst used for preparing acrylic acid by a propane selective oxidation method and a preparation method of the catalyst. Background technique [0002] Propane is the main component of oilfield gas, natural gas and refinery gas, and it is abundant and cheap. The price is about one-third of that of propylene, and it has not been developed and utilized more effectively. Today, there are abundant reserves of lower alkanes in the world, and my country is a country rich in propane resources, such as Daqing, Zhongyuan and Tarim oilfields, the gas contains about 6% propane, and the condensate contains about 3-6% propane. Propane accounts for about 60% in liquefied petroleum gas and up to 15% in natural gas. If a one-step oxidation process can be realized to prepare acrylic acid, the process route can be simplified and energy consumption can be reduced, which will have huge economic benefits and will drive th...

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Problems solved by technology

And in the preparation method of the composite metal oxide catalyst in the reported patent or literature all adopts solution method or dry method, the catalyst mechanical strength obtained is poor, particle is big, structure inhomogeneous, arrangement is irregular, catalytic activity is low and The disadvantages of poor reproducibility, low conversion rate of propane and low single-pass yield of acrylic acid limit the industrial application of composite metal oxide catalysts

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