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Method for converting n-butane into isobutane through using gold supported molecular sieve catalyst

A technology of n-butane and isobutane, applied in the field of catalysts, can solve problems such as the inability to obtain catalysts

Inactive Publication Date: 2013-06-12
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

[0118] The preparation method of 0.1%Au / HZSM-5:

[0119] (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.

[0120] (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 t...

Embodiment 2

[0126] 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

[0128] 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

A method for converting n-butane into isobutane through using a gold supported molecular sieve catalyst belongs to the technical field of catalysts. High-dispersion nano-gold particles are formed through the strong reaction of gold and high-silicon zeolite when nano-gold is loaded on the high-silicon zeolite. An acid is formed during the reaction of Au and a carrier because of the polarization effect of Au. A metal-acid difunctional catalyst is formed because the supported gold is still metallic. The molecular sieve is the high-silicon zeolite molecular sieve, and the preparation of the gold supported catalyst through a deposition-precipitation method under a negative pressure is in favor of cleaning the internal and external surfaces and the tunnels of the molecular sieve, so Au can easily enter the tunnels of the molecular sieve to reach high dispersion. The supported gold catalyst prepared in the invention has an acid site and a metal active site which are required by the isomerization of n-butane, so n-butane is dehydrogenated under the metal and acid difunctional action to generate olefin, olefin obtains a proton from the acid site to form a carbonium ion, and the carbonium ion undergoes skeletal isomerization and hydrogenation desorption to generate isobutene.

Description

technical field [0001] The invention belongs to the technical field of catalysts and relates to a method for converting n-butane into isobutane with a gold-loaded molecular sieve catalyst. Background technique [0002] N-butane is one of the important raw materials in the petrochemical industry. Its main sources are refined liquefied gas, catalytic cracking by-product liquefied gas and oilfield gas. The isomerization of n-butane has a wide range of applications. For example, the conversion of n-butane into isobutane can be used to synthesize alkylated gasoline, and can also be used to dehydrogenate isobutene to produce polymers; it can be used to produce high-octane number by alkylation reaction with a small amount of olefins Gasoline components; catalytic cracking to ethylene and propylene, etc. Early use of isomerization catalyst H 2 SO 4 Although HF and HF have strong acidity and low reaction temperature, they are highly corrosive and toxic. In the 1960s, anhydrous a...

Claims

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Application Information

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IPC IPC(8): C07C9/12C07C5/27B01J29/44B01J29/74B01J29/89B01J29/46
Inventor 郭洪臣艾沙努拉洪苗翠兰刘国东
Owner DALIAN UNIV OF TECH
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