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Supported type silver catalyst and preparation method thereof

A supported silver and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as affecting the optimal performance of catalysts, sintering cannot be fundamentally avoided, and achieve excellent catalysts performance, suitable for mass production, the effect of reducing the content

Active Publication Date: 2011-11-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology mentioned in the above-mentioned patent documents can improve the particle distribution and reduce the sintering tendency to a certain extent, but since the high-temperature process is still used in the formation of metallic silver particles, the sintering of the silver particles cannot be fundamentally avoided, thus affecting the catalytic performance of the catalyst. best possible performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Using commercially available α-Al 2 o 3 Dry the carrier at 120°C for 2 hours, weigh 100g after cooling, and take 38.67g of commercially available AgNO 3 Dissolved in deionized water, dilute to 100ml to obtain AgNO 3 solution, pipette 57ml of prepared AgNO 3 solution, weigh 8.8 mg of commercially available CsNO 3 Dissolve in 57ml prepared AgNO 3 solution, to α-Al 2 o 3 The prepared solution was impregnated with the carrier, and after standing for 20 minutes, a mixed solution of 20ml of deionized water and 20ml of isopropanol was poured into the carrier loaded with silver and cesium, and the excess solution was poured out after uniform dispersion. Use the product under vacuum 60 The Coγ radiation source was irradiated for 30h at a dose rate of 30Gy / min. The irradiated sample was dried at 120° C. for 6 hours to obtain catalyst A, wherein the Ag content was 14.0%, and the Cs content was 300 ppm.

Embodiment 2

[0032] With the same steps and conditions of Example 1, the difference is to use 47.2mg of commercially available CaNO 3 .4H 2 O instead of 8.8mg CsNO 3 Catalyst B was prepared with an Ag content of 14.0% and a Ca content of 400 ppm.

Embodiment 3

[0034] With the same steps and conditions of Example 1, the difference is to use 12.5mg of commercially available SrNO 3 Instead of 8.8mgCsNO 3 Catalyst C was prepared with an Ag content of 14.0% and a Sr content of 260 ppm.

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PUM

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Abstract

The invention discloses a supported type silver catalyst for producing ethylene oxide through ethylene oxidation and a preparation method thereof. The supported type silver catalyst is prepared by activating a main active component silver precursor and an auxiliary active component precursor, which are loaded on a carrier, through ionizing radiation. The supported type silver catalyst disclosed by the invention has the advantages of excellent property, simple and convenient preparation process, low cost, suitability for large-scale production, lowered production cost and reduced environmental pollution.

Description

technical field [0001] The invention relates to a silver catalyst, in particular to a supported silver catalyst for ethylene oxidation to produce ethylene oxide and a preparation method thereof. Background technique [0002] Under the action of silver catalyst, ethylene is oxidized to ethylene oxide, and carbon dioxide and water are produced by side reactions at the same time. Activity, selectivity and stability are the main performance indicators of silver catalyst. The performance of the catalyst is often closely related to the size and distribution of the silver particles dispersed on the carrier, so effectively controlling the size and distribution of the silver particles in the process of preparing the silver catalyst will greatly reduce the silver loading and improve the selectivity of the catalyst. Have a positive impact and can reduce production costs. [0003] Silver catalysts in the prior art are generally prepared by an impregnation method, that is, the carrier i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66B01J37/34
Inventor 朱云仙于海波戴伟彭晖毛祖旺乐毅穆玮
Owner CHINA PETROLEUM & CHEM CORP
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