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Catalyst for preparing isobutene through dehydrogenation of iso-butane and preparation method thereof

A technology for producing isobutene and catalysts, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor stability of isobutane dehydrogenation reaction, reduction of stabilization effect of platinum group metals, uneven dispersion, etc. problems, to achieve the effect of improving the catalytic activity of isobutane, excellent anti-coking performance, and high conversion rate of isobutane

Inactive Publication Date: 2010-10-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These catalysts use γ-Al 2 o 3 The pore size distribution of the carrier is wide, and it is easy to be covered by carbon deposits. 2 o 3 The uneven dispersion on the surface leads to the easy reduction of metals of Group IVA elements in the catalyst in a high-temperature, low-pressure hydrogen reaction atmosphere, which significantly reduces the stabilizing effect on metals of platinum group elements, and the stability of the isobutane dehydrogenation reaction is relatively low. Difference

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take cetyltrimethylammonium bromide and polyethylene glycol octylphenyl ether as a mixed template (the molar ratio of cetyltrimethylammonium bromide to polyethylene glycol octylphenyl ether is 3:1). Based on the molar amount of the mixed template agent, at 30° C., the molar ratio of aluminum isopropoxide to the mixed template agent is 8:1, and the molar ratio of water to the mixed template agent is 20:1. Put aluminum isopropoxide, dibutyltin oxide, water, and a mixed template into the reaction kettle, react for 15 hours, age at room temperature for 10 hours, filter, wash with absolute ethanol, dry at 120°C for 8 hours, and roast at 500°C for 6 hours to obtain A mesoporous alumina molecular sieve carrier with a tin-containing skeleton (the mass percentage of tin metal is 0.6 wt%). At 80°C, the mesoporous alumina molecular sieve carrier with a tin-containing skeleton impregnated with an auxiliary alkaline metal KCl aqueous solution for 3 hours, evaporated to dryness, dri...

Embodiment 2

[0021] Use N-dehydroabietyl-N, N, N-trimethylammonium methyl sulfate and polyoxyethylene-polyoxypropylene-polyoxyethylene as a mixed template (N-dehydroabietyl-N, N, N - The molar ratio of ammonium trimethyl sulfate methyl ester to polyoxyethylene-polyoxypropylene-polyoxyethylene two templates is 4:1). Based on the molar amount of the mixed template agent, at 40°C, the molar ratio of aluminum tri-sec-butyl alkoxide to the mixed template agent is 10:1, and the molar ratio of water to the mixed template agent is 30:1. Put aluminum tri-sec-butyl alkoxide, dibutyltin dimethoxide, water, and a mixed template into the reaction kettle, react for 25 hours, age at room temperature for 8 hours, filter, wash with absolute ethanol, and dry at 150°C for 8 hours, 500 Calcined at ℃ for 8 hours to obtain a mesoporous alumina molecular sieve carrier with a tin-containing framework (the mass percentage of tin metal is 1.2 wt%). At 80°C, impregnate the mesoporous alumina molecular sieve carrier...

Embodiment 3

[0024] Using N-dehydroabietyl-N, N-dimethyl-N-benzyl ammonium chloride and octadecyl primary amine as a mixed template (N-dehydroabietyl-N, N-dimethyl- The molar ratio of N-benzyl ammonium chloride to octadecyl primary amine is 3:1). Based on the molar amount of the mixed template agent, at 40° C., the molar ratio of aluminum isopropoxide to the mixed template agent is 8:1, and the molar ratio of water to the mixed template agent is 25:1. Put aluminum isopropoxide, distannoxane, water, and mixed template into the reaction kettle, react for 30 hours, age at room temperature for 10 hours, filter, wash with absolute ethanol, dry at 150°C for 10 hours, and roast at 600°C for 10 hours to obtain the skeleton A tin-containing mesoporous alumina molecular sieve carrier (the mass percentage of tin metal is 1.5 wt%). At 80°C, impregnate the mesoporous alumina molecular sieve carrier with a tin-containing skeleton as an alkaline metal La(NO 3 ) 3 The aqueous solution was evaporated to...

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Abstract

The invention discloses a catalyst for preparing isobutene through dehydrogenation of iso-butane and a preparation method thereof. The catalyst is prepared by the following steps of: co-dipping a carrier mesoporous alumina based molecular sieve of which the skeleton contains tin and a carrier modifier basic metal aid in a mixed aqueous solution of HaPtCl6 and SnCl4; and performing drying and reducing activation, wherein the basic metal is one or a mixture of several of IV and IIA elements and rare earth metals; based on the mesoporous alumina based molecular sieve, the skeleton tin metal accounts for 0.01 to 20 weight percent of the carrier; based on the mesoporous alumina based molecular sieve of which the skeleton contains tin, the active metal platinum accounts for 0.01 to 10 weight percent of the carrier, the aid metal tin accounts for 0.01 to 10 weight percent of the carrier and the aid basic metal accounts for 0.01 to 5 weight percent of the carrier. The catalyst has high iso-butane conversion rate, isobutene selectivity and reaction stability under the conditions of high temperature and low pressure.

Description

technical field [0001] The invention relates to a catalyst for producing isobutene by isobutane dehydrogenation and a preparation method thereof, which is suitable for gas-solid catalytic reaction and belongs to the catalyst preparation technology in the technical field of industrial catalysis. Background technique [0002] With the widening of isobutene application fields, the demand for isobutene is increasing, and it has become the most important basic petrochemical raw material in olefins except ethylene and propylene. my country is rich in C 4 Resources, mainly normal and isomeric alkanes and alkenes. At present, most of the isobutane in domestic catalytic cracking petroleum gas is burned as civil liquefied petroleum gas fuel, resulting in a great waste of resources. Therefore, it has important economic, social and environmental benefits to produce isobutene with high added value that is in short supply in the market through dehydrogenation catalytic reaction of large...

Claims

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Application Information

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IPC IPC(8): B01J29/00C07C11/09C07C5/333
Inventor 周钰明张一卫
Owner SOUTHEAST UNIV
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