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Method for converting n-alkane into isoalkane by gold-loaded molecular sieve catalyst

A technology of zeolite catalyst and n-butane, which is applied in the field of isoparaffins, and can solve the problems such as inability to obtain catalysts

Inactive Publication Date: 2012-04-18
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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  • Method for converting n-alkane into isoalkane by gold-loaded molecular sieve catalyst
  • Method for converting n-alkane into isoalkane by gold-loaded molecular sieve catalyst
  • Method for converting n-alkane into isoalkane by gold-loaded molecular sieve catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] Preparation of 0.1% Au / HZSM-5:

[0119] (1). Referring to the method disclosed in patent CN100364890C, ZSM-5 zeolite raw powder is synthesized, and the zeolite grain size is less than 50nm. Then calcined at 540° C. for 4 hours to obtain ZSM-5 zeolite.

[0120] (2). Ammonium exchange treatment: the calcined zeolite is subjected to ion exchange treatment with an ammonium salt solution at a suitable temperature. Then, it is washed with deionized water, dried and calcined to obtain hydrogen zeolite. Said ammonium salt is ammonium nitrate, the concentration of ammonium salt solution is 0.6mol / L, the liquid-solid volume ratio of ammonium salt solution and zeolite is 5:1, the exchange temperature is 30°C, the exchange time is 1 hour, and the exchange times are 2 times . The drying temperature is 110°C, the drying time is 12 hours, the firing temperature is 540°C, and the firing time is 6 hours. Na after exchange + The content is not higher than 0.5%.

[0121] (3). Acid p...

Embodiment 2

[0126] Repeat Example 1, but change the amount of chloroauric acid solution into 3.14ml and add water to dilute to 10ml, and the roasting temperature is 300°C. A 0.3% Au / HZSM-5 supported gold catalyst was obtained. Labeled: A-2.

Embodiment 3

[0128] Repeat Example 1, but change the vacuum to -0.01MPa, change the amount of chloroauric acid solution to 10.46ml, add water and dilute to 20ml, and obtain 1.0% Au / HZSM-5 supported gold catalyst. Labeled: A-3.

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Abstract

A method for converting n-alkane into isoalkane by a gold-loaded molecular sieve catalyst belongs to the technical field of catalysts. After a molecular sieve is treated by completely negative pressure degasification and purification, a gold precursor is loaded on the molecular sieve carrier by a negative pressure deposition precipitation method so as to form a Si-O(H)-Au structure. The molecular sieve is a high-silica zeolite molecular sieve; the preparation of gold-loaded catalyst under a negative pressure condition by the deposition precipitation method facilitates the purification of the internal and external surfaces and pore channels of the molecular sieve; and Au is easy to enter the pore channels of the molecular sieve to reach high dispersion, and can be combined with silicon hydroxyls on the internal and external surfaces to form the Si-O(H)-Au structure. The method can dehydrogenize n-alkanes to generate alkenes under the difunctional action of metal and the carrier; the alkenes obtain protons at the acid sites to form carbonium ions; and isoalkanes are generated by skeletal isomerization and hydrogenation desorption of the carbonium ions.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a method for converting normal alkanes into isoparaffins with a gold-loaded molecular sieve catalyst. Background technique [0002] The isomerization of normal hydrocarbons is one of the important reactions in the petrochemical industry, and isomerized hydrocarbons have a wide range of uses. For example, converting n-butane into isobutane can be used to synthesize alkylated gasoline, and can also be used to dehydrogenate isobutene to produce polymers; another example is to convert C 5 -C 8 Normal paraffins are isomerized and can be used to produce high-octane gasoline components and more. 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 aluminum chloride was used as an isomerization catalyst. Although aluminum chloride has high activity and relativel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/44B01J29/74B01J29/89B01J29/035B01J29/46C07C9/12C07C9/16C07C9/18C07C5/27
Inventor 郭洪臣艾沙努拉洪苗翠兰刘国东
Owner DALIAN UNIV OF TECH
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