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Method for converting normal olefine into isomeric olefine with gold-supported molecular sieve catalyst

A technology for iso-olefin and olefin isomerization, which is applied in the field of iso-olefin and can solve problems such as the inability to obtain catalysts and the like

Inactive Publication Date: 2013-05-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When ZSM-5 is used as a carrier, only supported gold catalysts with gold particles of 40-50nm can be obtained, and Au / ZSM-5 catalysts with smaller particles cannot be obtained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0167] The preparation method of 0.1%Au / HZSM-5:

[0168] (1). Synthesize ZSM-5 molecular sieve raw powder with reference to the method disclosed in the published patent CN100364890C. Calcined at 540 DEG C for 4 hours to obtain ZSM-5 molecular sieves.

[0169] (2). Ammonium exchange treatment: the calcined molecular sieve is subjected to ion exchange treatment with an ammonium salt solution at a suitable temperature. Then, it is washed with deionized water to neutrality, then dried and calcined to obtain a hydrogen-type catalyst. Said ammonium salt is ammonium nitrate, and ammonium salt solution concentration is 0.6mol / L, and the liquid-solid volume ratio of catalyzer and ammonium salt solution is 5:1, and exchange temperature is 30 ℃, and exchange time is 1 hour, and exchange number of times is 2 Second-rate. 110 DEG C of drying temperature, 12 hours of drying time, 540 DEG C of roasting temperature, 6 hours of roasting time. Na after exchange + The content is not higher ...

Embodiment 2

[0175] Repeat Example 1, but change the amount of chloroauric acid solution into 3.14ml and add water to 10ml, and the roasting temperature is 300°C. A supported gold catalyst 0.3%Au / HZSM-5 was obtained. Labeled: A-2.

Embodiment 3

[0177] Repeat embodiment 1, but change the degree of vacuum into-0.05MPa, and the consumption of chloroauric acid solution is changed into 10.46ml. The supported gold catalyst 1.0%Au / HZSM-5 was obtained. Labeled: A-3.

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Abstract

The invention belongs to the technical field of catalysts, and relates to a method for converting normal olefine into isomeric olefine with a gold-supported molecular sieve catalyst. After a molecular sieve is subjected to sufficient negative-pressure degasification purifying treatment, a gold precursor is supported onto the molecular sieve support by a negative-pressure deposition precipitation process to obtain the uniformly-dispersed small-granularity supported nanogold catalyst. The molecular sieve is a silica-rich zeolite molecular sieve. The gold-supported catalyst prepared by the deposition precipitation process under negative-pressure conditions is beneficial to purifying the internal and external surfaces and pores of the molecular sieve, so that the Au can easily enter the pores of the molecular sieve, thereby achieving the goal of high dispersity. By using the method, the normal olefine can obtain protons at the acid center under the dual functions of the metal and support to form carbonium ions, and the carbonium ions are subjected to framework isomerization to generate the isomeric olefine.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a method for converting normal olefins into isomeric olefins with a gold-loaded molecular sieve catalyst. Background technique [0002] As a vehicle fuel, gasoline must have a high octane number and good stability. In the FCC process reaction, olefins are the products produced by the cracking of raw materials, and are also the products of subsequent isomerization, aromatization, hydrogen transfer and The product of re-cracking. The octane number of olefins is higher than that of alkanes, but the stability is poor. The octane number of internal olefins is higher than that of terminal olefins. The octane number of branched olefins is higher than that of linear olefins and has better stability. Carbon ions, undergo hydrogen transfer reaction, easily generate isoparaffins to reduce olefin content and increase gasoline stability. Olefin reduction technology mainly uses the catalytic...

Claims

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Application Information

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IPC IPC(8): C07C5/27C07C11/10C07C11/09B01J29/44B01J29/74B01J29/89
Inventor 郭洪臣艾沙努拉洪苗翠兰刘国东
Owner DALIAN UNIV OF TECH
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