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Light alkane dehydrogenation catalyst with good hydrothermal stability and preparation method thereof

A technology of dehydrogenation catalyst and hydrothermal stability, applied in the field of chemistry, can solve problems such as unresolved structural stability of catalysts, uneven distribution of active components, hydration and pulverization of carriers, etc., to improve activity and product selectivity , Improve the anti-hydration performance and prevent chalking

Inactive Publication Date: 2014-11-05
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN668555A discloses a dehydrogenation catalyst containing alumina, chromium oxide, lithium oxide and sodium oxide. The catalyst is also prepared by first preparing an alumina carrier, and then loading the active components by impregnation. The catalyst has the problem of carrier hydration and pulverization
The catalyst is made of Cr 2 o 3 , CaO, K 2 O, Al 2 o 3 Composition, with Cr 2 o 3 The powder is used as a raw material, and 10% nitric acid is used as a peptizer to make a dehydrogenation catalyst through kneading, extruding, drying, and roasting. Although this method partially solves the problem of uneven distribution of active components in the catalyst, due to the use of Cr 2 o 3 Powder is the raw material, and its interaction with alumina is weak, therefore, the structural stability of the catalyst remains unresolved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh Mg(NO 3 ) 2 ·6H 2 O100g, miscible in 1000ml deionized water, add 300g pseudo-boehmite (Al 2 o 3 content of 65%), beating for 2 hours to uniformly form a thin paste, spray drying at 200°C with a spray dryer to form microspheres, and then roasting at 550°C for 10 hours in an air atmosphere to obtain a catalyst carrier;

[0033] Weigh Cr(NO 3 ) 3 9H 2 O250g, KNO 3 5g, miscible in 100ml deionized water, then pour the above catalyst carrier into it, stir evenly, dry at 200°C for 10h, and roast at 650°C for 5h to obtain dehydrogenation catalyst A with a particle size of 20-200μm.

Embodiment 2

[0035] Weigh Mg(NO 3 ) 2 ·6H 2 O100g, Al(NO 3 ) 3 9H 2 O1000g, miscible in 1500ml deionized water, add ZnO30g, beating for 2h to evenly form a thin paste, use a spray dryer to spray dry at 150°C into microspheres, then roast at 650°C for 5h under air atmosphere to obtain a catalyst carrier;

[0036] Weigh CrO 3 100g, K 2 CO 3 10g, miscible in 80ml deionized water, then pour the catalyst carrier into it, stir evenly, dry at 150°C for 10h, and roast at 550°C for 10h to obtain dehydrogenation catalyst B with a particle size of 20-200μm.

Embodiment 3

[0038] Take by weighing MgO50g, add 1000g aluminum sol (Al 2 o3 content of 20%), beating for 2 hours to uniformly form a thin paste, spray drying at 300°C with a spray dryer to form microspheres, and then roasting at 600°C for 5 hours in an air atmosphere to obtain a catalyst carrier;

[0039] Weigh CrO 3 100g, K 2 CO 3 15g, miscible in 100ml deionized water, then pour the above catalyst carrier into it, stir evenly, dry at 150°C for 10h, and roast at 700°C for 10h to obtain dehydrogenation catalyst C with a particle size of 20-200μm.

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PUM

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Abstract

The invention relates to a light alkane dehydrogenation catalyst with good hydrothermal stability and a preparation method thereof. The catalyst comprises the following components, by weight, 5-40% of Cr2O3, 30-85% of Al2O3, 0.1-30% of MO and 0.5-5% of Me2O, wherein M is Mg, Zn or a mixture of Mg and Zn; and Me is one of alkalis or a mixture of more than two of alkalis. The light alkane dehydrogenation catalyst has advantages of good hydrothermal stability, high activity and high selectivity, and is used in a dehydrogenation reaction of C3-C5 alkane.

Description

technical field [0001] The invention relates to a low-carbon alkane dehydrogenation catalyst with good hydrothermal stability and a preparation method thereof, belonging to the field of chemistry. Background technique [0002] The dehydrogenation of low-carbon alkanes to produce low-carbon olefins is an important industrial production process. For example, the dehydrogenation of propane to produce propylene and the dehydrogenation of isobutane to produce isobutene have important practical value. Propylene and isobutene are widely used and are important chemical industries. raw material. with Cr 2 o 3 / Al 2 o 3 As a catalyst, it can dehydrogenate propane or isobutane to produce propylene or isobutene at a reaction temperature of about 600°C. Use Cr 2 o 3 / Al 2 o 3 When used as a dehydrogenation catalyst, although this catalyst has a high dehydrogenation activity, it has the problem of rapid coking during the dehydrogenation process and needs to be regenerated repeate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/26C07C5/333C07C11/09
Inventor 房德仁任万忠刘尚秦玉武张梨梅刘丽花李天文
Owner YANTAI UNIV
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