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

A carbon alkane chromium-based, dehydrogenation catalyst technology, applied in catalyst activation/preparation, carbon compound catalysts, including molecular sieve catalysts, etc., can solve the problems of single use range, low crushing strength, poor stability, etc. Improve stability, enhance the effect of stability

Active Publication Date: 2021-01-22
REZEL CATALYSTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the problems of poor stability, low selectivity, low crushing strength and single application range of low-carbon alkane chromium-based dehydrogenation catalysts in the existing fixed bed, the present invention provides a low-carbon alkane chromium containing spinel structure dehydrogenation catalyst

Method used

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

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preparation example Construction

[0050] A preparation method of a fixed-bed carrier containing a low-carbon alkane chromium series dehydrogenation catalyst with a spinel structure, comprising the following steps:

[0051] a) Mix alumina stone powder, silica gel powder or molecular sieve with concentrated nitric acid, sage powder and demineralized water in a mass ratio of 100:5-10:5-10:10-80, extrude strips on a 4.5mm orifice plate, and dry, Obtain a strip-shaped fixed bed carrier;

[0052] b) calcining the strip-shaped fixed-bed carrier at 400-1000° C. for 1-10 hours to obtain a fixed-bed carrier with a specific surface area of ​​50-500 m2 / g and a pore diameter range of 5-40 nm;

[0053] c) configuring required soluble solutions containing chromium, soluble solutions of alkaline earth metal salts, soluble solutions of Group IVB elements and soluble solutions of rare earth elements, and mixing them into a mixed solution;

[0054] d) Impregnating the fixed bed carrier and the mixed solution under vacuum condit...

Embodiment 1

[0057] Embodiment 1-alumina fixed bed carrier preparation

[0058] Add 100g of basalt powder in the kneader, add 3g of celadonite powder and mix evenly; weigh 2.8g of concentrated nitric acid and add it to 45g of water to configure a nitric acid solution, and add this solution to the mixture of pseudoboehmite and celadonite powder, Knead for 1 hour, and extrude on a 4.5mm orifice plate; dry the extruded strip-shaped fixed-bed carrier at 120°C for 2 hours, cut into pellets, and heat up to 900°C at a rate of 3°C per minute. Roast for 4-8 hours to obtain the fixed bed carrier I; its water absorption is measured to be 40%.

Embodiment 2

[0059] Embodiment 2-Silica fixed bed carrier preparation

[0060] Add 88g of silica gel powder in the kneader, add 3g of kale powder and mix evenly; weigh 2.8g of concentrated nitric acid and add it to 45g of water to form a nitric acid solution, and add this solution to the mixture of pseudoboehmite and kale powder, Knead for 1 hour, and extrude on a 4.5mm orifice plate; dry the extruded strip-shaped fixed-bed carrier at 120°C for 2 hours, cut into pellets, and heat up to 900°C at a rate of 3°C per minute. Roast for 4-8 hours to obtain the fixed bed carrier II; its water absorption is measured to be 40%.

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26B01J29/48B01J35/10B01J37/02C07C5/333C07C11/06C07C11/09
CPCB01J23/26B01J23/005B01J29/48B01J37/0201C07C5/3332C07C2523/26C07C2529/48B01J2229/186B01J35/613B01J35/647B01J35/615C07C11/06C07C11/09Y02P20/52
Inventor 卓润生孙秋实张俊张平杨光友兰兴玥刘兵刘新生
Owner REZEL CATALYSTS CO LTD
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