Low-carbon alkane chromium dehydrogenation catalyst containing a spinel structure and preparation method thereof

Abstract

The invention discloses a low-carbon alkane chromium dehydrogenation catalyst containing a spinel structure and a preparation method thereof. The low-carbon alkane chromium dehydrogenation catalyst isused in a fixed bed, the reaction pressure is 0.01-1 MPa, the temperature is 530-660 DEG C, and the mass space velocity is 0.3-8 h<-1>. The low-carbon alkane chromium dehydrogenation catalyst comprises the following components in percentage by mass based on the total mass of a dry base of the low-carbon alkane chromium dehydrogenation catalyst: 0.1-30% of chromium oxide, 0.1-10% of a first auxiliary agent, 0.1-10% of a second auxiliary agent, 0.1-10% of a third auxiliary agent and the balance of a fixed bed carrier. The third additive is one or a mixture of more of rare earth elements. The catalyst has good acidity, so that the catalyst has higher target product selectivity, and acidic cracking is avoided to the greatest extent; the catalyst has a stable spinel structure, the strength andstability of the catalyst are remarkably enhanced, the catalyst has longer service life and excellent selectivity and stability, and the carbon deposition resistance of the catalyst in the light alkane reaction process is remarkably enhanced.

Description

technical field

[0001] The invention belongs to the technical field of catalytic cracking, and in particular relates to a low-carbon alkane chromium-based dehydrogenation catalyst containing a spinel structure and a preparation method thereof. Background technique

[0002] In recent years, with the rapid development of the international petrochemical industry, the demand for low-carbon olefins is also increasing. The main ways to obtain low-carbon olefins include the following aspects: the current main production processes are catalytic cracking technology and steam cracking technology, but these two technologies have the disadvantages of high energy consumption and low olefin yield; The low-carbon olefins obtained by the technology and the methanol-to-olefins technology do not have market competitiveness due to problems such as high cost. Compared with other technologies for producing low-carbon olefins, the equipment investment cost of direct dehydrogenation reaction for ...

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