Anti-carbon-formation chromium-based catalyst for preparing propylene from propane through oxydehydrogenation, and preparation method and application thereof

Abstract

The invention provides an anti-carbon-formation chromium-based catalyst for preparing propylene from propane through oxydehydrogenation, and a preparation method and application thereof, belonging tothe technical field of chemical catalysis. According to the invention, rod-like alumina originated from ZL201110196192.4 and rich in unsaturated ligand is used as a carrier; since the surface of the Al2O3 has a great number of hydroxyl unsaturated ligand Al<3+>, the active component Cr2O3 can be better anchored, strong interaction among the Cr2O3 and the Al2O3 is formed, agglomeration of the Cr2O3during a reaction is prevented, side reactions are inhibited, and propylene is prevented from carbon formation due to further dehydrogenation and polymerization; thus, the catalyst is allowed to maintain high propylene selectivity and is improved in stability. Therefore, the Al2O3 used as the carrier is helpful for improving the selectivity and inactivation resistance of the catalyst. Compared with conventional catalysts, the catalyst provided by the invention is high in propylene selectivity, slow in carbon formation and inactivation rates, high in stability and greatly improved in mechanical strength, and has good industrial application prospects.

Description

technical field [0001] The invention relates to a carbon-deposition-resistant chromium-based propane dehydrogenation propylene catalyst, a preparation method and application, and belongs to the technical field of chemical catalysis. Background technique [0002] As one of the basic raw materials in the chemical industry, propylene can be used to produce a series of downstream chemicals such as polymers and olefin oxides. Due to the rapid growth of downstream products in recent years, the demand for propylene is increasing day by day. At present, the catalytic cracking process of petroleum and the steam cracking process of naphtha are the main sources of propylene, but with the increasing shortage of petroleum resources, the traditional propylene production technology has been difficult to meet the rapidly growing demand for propylene, so the development of new propylene production Technology seems to be very urgent. my country's liquefied petroleum gas reserves are huge, a...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a catalyst for propane dehydrogenation to prepare propylene, aiming at the shortcomings of the catalyst being easy to deactivate due to carbon deposition and poor stability. Alumina [ZL201110196192.4] is the carrier, the Al 2 o 3 There are a lot of hydroxyl unsaturated coordination Al on the surface 3+ (pentacoordination), helps to anchor the active component Cr 2 o 3 , so that Cr 2 o 3 and Al 2 o 3 Form a strong interaction between them, preventing the Cr during the reaction process 2 o 3 agglomeration, suppress side reactions, prevent further dehydrogenation of propylene, and form carbon deposits during polymerization, thereby promoting the catalyst to maintain high propylene selectivity while improving the stability of the catalyst

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