Method for use of modified molecular sieve catalyst in catalytic cracking of propane

A catalytic cracking and catalyst technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., 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 o...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] The preparation method of 0.1%Au / HZSM-5:

[0115] (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.

[0116] (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

[0122] 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

[0124] 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

Belonging to the technical field of catalysts, the invention relates to a method for use of a modified molecular sieve catalyst in catalytic cracking of propane. The method is characterized by subjecting a molecular sieve to a full negative pressure degassing purification treatment, and then loading a gold precursor onto a molecular sieve carrier by a negative pressure deposition-precipitation technique, thus obtaining a uniform and highly disperse granule loaded nanogold catalyst. The molecular sieve refers to a high-silicon zeolite molecular sieve. Preparation of the loaded gold catalyst through the deposition-precipitation technique under a negative pressure condition is in favor of purifying the inner and outer surfaces of the molecular sieve and pore channels, so that Au can be easy to enter the pore channels of the molecular sieve and high dispersion can be achieved. The method provided in the invention can make propane undergo dehydrogenation to produce olefin under the difunctional actions of the metal and the carrier. The olefin can acquire protons at an acid site to form carbonium ions, which then undergo polymerization cracking to generate corresponding olefin.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a method for catalytically cracking propane with a modified molecular sieve catalyst. Background technique [0002] Propane comes from oilfield liquefied gas, and can also come from secondary processing of petroleum. Propane can be used as raw material for steam cracking and dehydrogenation. In the steam process, propane is dehydrogenated to propylene through a free radical reaction. The dehydrogenation reaction of propane includes catalytic oxidative dehydrogenation and catalytic dehydrogenation. The products in the oxidative dehydrogenation process are complex and difficult to separate, the yield of olefins is low, and deep oxidation is prone to occur. At present, the catalytic dehydrogenation processes that have been industrialized include Oleflex process and Catofin process. The catalyst systems are Pt-based and Cr-based respectively. Their common disadvantage is that they ...

Claims

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Application Information

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IPC IPC(8): B01J29/44B01J29/74B01J29/89B01J29/46B01J29/48B01J29/035C07C11/04C07C11/06C07C11/09C07C15/02C07C5/333C07C6/00C10L3/06
CPCY02P20/52
Inventor 郭洪臣刘家旭艾沙努拉洪
Owner DALIAN UNIV OF TECH
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