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Preparation method of low-carbon alkane dehydrogenation catalyst

A technology for dehydrogenation catalysts and low-carbon alkanes, applied in the direction of carbon compound catalysts, catalysts, hydrocarbons, etc., can solve the problems of poor catalyst activity, difficult to control the dispersion state of active component chromium, poor catalyst stability, etc., to achieve anti-deposition Effects of improving carbon performance, reducing the amount of B acid, and improving utilization efficiency

Active Publication Date: 2020-03-10
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The above catalyst preparation methods often adopt the impregnation method, and the dispersion state of the active component chromium is difficult to control. Too high dispersion will cause poor stability of the catalyst; too low dispersion will lead to poor activity of the catalyst.

Method used

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  • Preparation method of low-carbon alkane dehydrogenation catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 2.23g (NH 4 ) 2 Cr 2 o 7 Dissolve in 8ml ethylene glycol, impregnate equal volume into 10g porous γ-Al 2 o 3 in powder. The powder was placed in an oven at 120°C for 4 hours, washed with deionized water, filtered, and dried at 80°C for 2 hours. 0.37gKNO 3 Dissolve in 8ml of deionized water, impregnate equal volume into the above-mentioned treated powder, dry at 80°C for 4 hours, calcined at 680°C for 5 hours, and form and sieve to obtain the catalyst, which is designated as Catalyst A.

Embodiment 2

[0040] 1.77gCrO 3 , 2.48g (NH 4 ) 2 C 2 o 4 Dissolve in 8ml deionized water, impregnate equal volume into 10g porous γ-Al 2 o 3 in powder. The powder was placed in an oven at 60°C for 6 hours, washed with deionized water, filtered, and dried at 100°C for 2 hours. 0.78gCu(NO 3 ) 2 ·3H 2 O, 1.12gFe(NO 3 ) 3 9H 2 O was dissolved in 7ml of deionized water, impregnated into the above-mentioned treated powder with equal volume, dried at 120°C for 3 hours, calcined at 700°C for 6 hours, and the catalyst was obtained by forming and sieving, which was designated as catalyst C.

Embodiment 3

[0044] 1.30gK 2 Cr 2 o 7 Dissolve in 8ml glycerol, impregnate equal volume into 10g porous γ-Al 2 o 3 in powder. The powder was placed in an oven at 140°C for 1 hour, washed with deionized water, filtered, and dried at 80°C for 4 hours. 0.33gNaNO 3 , 0.82gNi(NO 3 ) 2 ·6H 2 O was dissolved in 8ml of deionized water, impregnated into the above-mentioned treated powder with equal volume, dried at 60°C for 6 hours, calcined at 720°C for 4 hours, and the catalyst was obtained by shaping and sieving, which was designated as Catalyst E.

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Abstract

The invention discloses a low-carbon alkane dehydrogenation catalyst preparation method, which comprises: dissolving a high-valent chromium precursor in a reducing agent solution, impregnating into an alumina-based carrier, carrying out a reaction for 0.5-20 h at a temperature of 30-200 DEG C, washing, filtering, drying, impregnating into an aid, drying, and calcining to obtain the low-carbon alkane dehydrogenation catalyst. According to the present invention, the Cr cluster can be controlled; and the catalyst with the moderate Cr dispersion degree is obtained through the in-situ reduction method, such that the acid quantity of the acid B on the catalyst surface is reduced, the utilization efficiency of the active atom Cr is improved, and the dehydrogenation activity, the selectivity and the anti-carbon-deposition performance of the catalyst are improved.

Description

technical field [0001] The invention relates to a preparation method of a low-carbon alkane dehydrogenation catalyst, in particular to a preparation method of a catalyst for producing propylene from propane dehydrogenation and butane dehydrogenation to butene. Background technique [0002] In recent years, with the rapid development of the global petrochemical industry, the demand for low-carbon olefins is also increasing. The dehydrogenation technology of low-carbon alkanes is an effective way to increase the production of C3-C4 olefins. [0003] The catalytic dehydrogenation reaction of light alkanes is limited by thermodynamic equilibrium, and must be carried out under harsh conditions of high temperature and low pressure. Excessively high temperature will intensify the cracking reaction and deep dehydrogenation of alkane, and reduce the selectivity; at the same time, it will accelerate the surface carbon of the catalyst and make the catalyst deactivate rapidly. [0004...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/26B01J23/86C07C5/333C07C11/06C07C11/09
CPCB01J23/002B01J23/26B01J23/862B01J23/864B01J23/866B01J23/868B01J2523/00C07C5/3332C07C2523/26C07C2523/86B01J2523/13B01J2523/31B01J2523/67B01J2523/17B01J2523/842B01J2523/12B01J2523/847B01J2523/3706B01J2523/23B01J2523/24B01J2523/845C07C11/06C07C11/09Y02P20/52
Inventor 周金波邹国军李长明王艳飞苟文甲程中克郭珺李博唐迎春马艳捷
Owner PETROCHINA CO LTD
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