Preparing method and application of loading type gold catalyst

A gold catalyst and supported technology, applied in the field of supported gold catalyst and its preparation, can solve the problems of narrow distribution, poor repeatability, low gold utilization efficiency, etc.

Pending Publication Date: 2019-04-19
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0003] However, the preparation of gold catalysts for direct gas-phase epoxidation of propylene by deposition-precipitation method is complex, affected by various preparation factors, poor repeatability, and the gold loading efficiency is extremely low (<3.0%)
The gold catalyst prepared by the grinding method has disadvantages such as the price of the gold precursor used is very expensive, and the catalyst prepared by the sol-gel method has problems such as low selectivity and low gold utilization efficiency.
The gold catalyst prepared by impregnation method using chloroauric acid as the precursor has a low dispersion. Haurta found that the particle size of the catalyst prepared by impregnating chloroauric acid on titanium dioxide is greater than 20 nanometers. In the gas phase epoxidation of propylene The selectivity is very low, and most of them generate carbon dioxide. They believe that the residual chloride ions on the surface will easily cause gold particles to agglomerate during the catalyst activation process. gold nanoparticles

Method used

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  • Preparing method and application of loading type gold catalyst
  • Preparing method and application of loading type gold catalyst
  • Preparing method and application of loading type gold catalyst

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[0030] Specifically, the present invention provides a method for preparing a supported gold catalyst for the direct gas-phase epoxidation of propylene to prepare propylene oxide by means of an impregnation method. The method comprises the steps of:

[0031] In the first step, the gold precursor solution is mixed with a titanium-containing carrier and dried to obtain a solid sample;

[0032] In the second step, the solid sample is subjected to high-temperature treatment in a certain atmosphere to obtain a supported gold catalyst.

[0033] In one embodiment of the present invention, the gold precursor solution used in the above-mentioned first step is formed by mixing the gold precursor with a solvent; the gold precursor includes chloroauric acid or its derivatives, inorganic gold compounds and Organogold compounds.

[0034] In one embodiment of the present invention, said chloroauric acid derivatives include one or more of cesium chloroaurate, potassium chloroaurate, sodium c...

Embodiment 1

[0060] Preparation of Gold Catalyst Using Triphenylphosphine Gold Chloride as Precursor

[0061] Take 1 gram of TS-2 whose micropores have not been blocked by microporous template agent after high-temperature roasting, and place it in a 10mL glass beaker, then weigh 0.20mL of a mixed solution of triphenylphosphine gold chloride and acetone (0.005g / mL), then stirred evenly with a glass rod, stood at room temperature for 12h, then evacuated overnight at room temperature, and then placed the solid in a fixed-bed reactor, from room temperature to 1 degree / min rate to 150 degree, that is, a catalyst with a low loading of 0.04wt%.

Embodiment 2

[0063] Preparation of Gold Catalyst Using Methyl(triphenylphosphine) Gold(I) as Precursor

[0064] Take 1 gram of TS-2 whose micropores have not been blocked by microporous template agent after high-temperature roasting, and place it in a 10mL glass beaker, and then weigh 0.20mL of methyl (triphenylphosphine) gold (I) and acetone with a pipette. Mix the solution (0.005g / mL), then stir it evenly with a glass rod, let it stand at room temperature for 12h, then evacuate it at room temperature overnight, then place the solid in a fixed bed reactor in a gas composition of oxygen / nitrogen The temperature was raised from room temperature to 280 degrees at a rate of 1 degree / minute, and a catalyst with a low loading of 0.04 wt % was obtained.

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Abstract

The invention discloses a preparing method and application of a loading type gold catalyst. The method includes the steps of mixing a titanium-containing carrier with a gold precursor solution, conducting thermal treatment after drying to obtain the loading type gold catalyst. The gold precursor comprises chloroauric acid or derivatives thereof, inorganic gold compounds and organic gold compounds.

Description

technical field [0001] The invention relates to a catalyst, in particular to a supported gold catalyst for direct epoxidation of propylene gas and a preparation method thereof. Background technique [0002] Propylene oxide (PO) is one of the fifty most produced chemicals in the world, and is the third largest propylene derivative after polypropylene and acrylonitrile. At present, PO is widely used in the production of polyether, propylene glycol, polyurethane, etc., and is also the main raw material of the fourth-generation detergent non-ionic surfactant, oilfield demulsifier and pesticide emulsifier, etc., with broad development prospects. Propylene gas-phase direct epoxidation method uses a supported gold catalyst to catalyze the epoxidation of propylene to prepare propylene oxide under the coexistence of hydrogen and oxygen. This method has the advantages of environmental protection, simple operation, and high selectivity (>90%). It has received widespread attention a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/89C07D303/04C07D301/10
CPCB01J29/89C07D301/10C07D303/04
Inventor 周兴贵张志华段学志钱刚周静红
Owner EAST CHINA UNIV OF SCI & TECH
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