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Catalyst for preparation of isobutylene from isobutane through fixed bed dehydrogenation and preparation method thereof

A catalyst and fixed bed technology, which is applied in the field of isobutene catalytic dehydrogenation of isobutane and its preparation field, can solve the problems of insufficient thermal stability, poor mechanical strength, poor activity, etc., achieve good industrial application prospects, improve Thermal stability, activity-enhancing effects

Active Publication Date: 2017-02-01
WUHAN KELIN FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the shortcomings of existing isobutane dehydrogenation catalysts such as poor activity, poor mechanical strength, and insufficient thermal stability, the invention provides a fixed-bed isobutane dehydrogenation catalyst and a preparation method thereof

Method used

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  • Catalyst for preparation of isobutylene from isobutane through fixed bed dehydrogenation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 50 grams of Cr(NO 3 ) 3 •9H 2 O, 283.8 g Al(NO 3 ) 3 9H 2 O, 0.876 g Ni(NO 3 ) 2 ·6H 2 O, 0.891 g TiCl 4 Dissolve in 2237mL deionized water, stir evenly; then slowly drop in 0.25mol / L Na 2 CO 3 Solution to pH value of 9, continue to stir for 5min, then sonicate for 5min, then stand and age for 2h, then filter, wash, add 6.52 grams of aluminum sol (containing 23wt%Al 2 o 3 ) extrusion molding, drying, and finally put the above catalyst in a tubular muffle furnace, pass in a mixed atmosphere of water vapor and air (volume ratio 1:4), control the calcination temperature at 850 °C, and the volume space velocity of the mixed atmosphere is 500h -1 , Calcined for 4h to obtain catalyst A.

Embodiment 2

[0028] Weigh 26.5 grams of Cr 2 (SO 4 ) 3 , 289.3 grams of Al(NO 3 ) 3 9H 2 O, 0.876 g Ni(NO 3 ) 2 ·6H 2 O, 0.891 g TiCl 4 Dissolve in 907mL deionized water, stir evenly; then slowly drop in 0.75mol / L Na 2 CO 3 Solution to pH value of 11, continue to stir for 5min, then sonicate for 5min, then stand and age for 2h, then filter, wash, add 3.26 grams of aluminum sol (containing 23wt%Al 2 o 3) extrusion molding, drying, and finally put the above catalyst in a tubular muffle furnace, pass in a mixed atmosphere of water vapor and air (volume ratio of 2:3), control the calcination temperature at 750 ° C, and the volume space velocity of the mixed atmosphere is 300h -1 , Calcined for 7h to obtain catalyst B.

Embodiment 3

[0030] Weigh 33.3 g CrCl 4 •6H 2 O, 287.4 g Al(NO 3 ) 3 9H 2 O, 0.876 g Ni(NO 3 ) 2 ·6H 2 O, 0.891 g TiCl 4 Dissolve in 1612mL deionized water, stir evenly; then slowly drop in 0.50mol / L Na 2 CO 3 Solution to pH value of 9.8, continue to stir for 5min, then sonicate for 5min, then stand and age for 2h, then filter and wash; add 4.35 grams of aluminum sol (containing 23wt%Al 2 o 3 ) extrusion molding, drying, and finally put the above catalyst in the tubular muffle furnace, pass into the mixed atmosphere of water vapor and air (volume ratio is 3:2), control the calcination temperature to 950 ℃, the volume space velocity of the mixed atmosphere is 200h -1 , Calcined for 5h to obtain catalyst C.

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Abstract

The invention provides a catalyst for preparation of isobutylene from isobutane through fixed bed dehydrogenation and a preparation method thereof. The catalyst uses Cr2O3 as an active component and Al2O3 as a carrier, an aid A is selected from oxide of a group VIII element, and an aid B is selected from oxide of a group IV B element; and the final catalyst comprises the following components in percentage by mass: 10-25% of Cr2O3, 0.1-1.0% of aid A, 0.5-1.5% of aid B and the balance of aluminum oxide. The preparation method of the catalyst comprises the following steps: coprecipitating to obtain a precursor, forming, drying, and performing steam roasting to obtain the final catalyst. The catalyst provided by the invention has excellent dehydrogenation activity, mechanical strength and heat stability.

Description

technical field [0001] In general terms, the present invention relates to the field of catalysts. Specifically, the invention relates to a catalyst for preparing isobutene by catalytic dehydrogenation of isobutane in a fixed bed and a preparation method thereof. Background technique [0002] Isobutene is a very important organic chemical intermediate, mainly used in the preparation of methyl tert-butyl ether (MTBE, high-octane clean gasoline blending component), butyl rubber, polyisobutylene, methacrylate, tert-butyl Various organic raw materials and fine chemicals such as phenol, tert-butylamine, 1,4-butanediol, ABS resin, etc. In recent years, with the rapid development of petrochemical and related industries, my country's demand for isobutene is also increasing; my country's low-carbon alkanes are usually used as fuel, which greatly reduces the utilization value of isobutane. The production of isobutene by catalytic dehydrogenation of isobutane with low utilization rate...

Claims

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Application Information

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IPC IPC(8): B01J23/86C07C5/333C07C11/09
CPCB01J23/002B01J23/866B01J2523/00C07C5/3332C07C2523/86B01J2523/31B01J2523/47B01J2523/67B01J2523/847C07C11/09
Inventor 张先茂袁鹏王泽王国兴郑敏王天元陈凯金建涛
Owner WUHAN KELIN FINE CHEM
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