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Method for converting n-paraffins into isoparaffins through using gold supported molecular sieve catalyst

A technology of normal alkanes and catalysts, which is applied in the field of isoparaffins and can solve problems such as 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

[0115] The preparation method of 0.1%Au / HZSM-5:

[0116] (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.

[0117] (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

[0123] 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

[0125] 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-paraffins into isoparaffins through using a gold supported molecular sieve catalyst belongs to the technical field of catalysts. A molecular sieve is subjected to full negative-pressure degassing purifying treatment, and a gold precursor is loaded on the molecular sieve carrier through adopting a negative-pressure deposition-precipitation method to obtain the uniform-dispersion small-granule supported nano-gold catalyst. The molecular sieve is a high-silicon zeolite molecular sieve, and the preparation of the gold supported catalyst through the 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 method provided by the invention allows n-paraffins to be dehydrogenated under the metal and carrier difunctional action to generate olefins, olefins obtain protons from acid sites to form carbonium ions, and the carbonium ions undergo skeletal isomerization and hydrogenation desorption to generate isoparaffins.

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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IPC IPC(8): B01J29/44B01J29/74B01J29/89B01J29/03B01J29/46B01J29/48C07C5/27C07C9/12C07C9/18C10G35/095C10G45/64
Inventor 郭洪臣艾沙努拉洪苗翠兰刘国东
Owner DALIAN UNIV OF TECH
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