Preparation method of high-efficiency silver catalyst for preparing ethylene oxide through ethylene oxidation with polypeptide as three-dimensional guiding agent

A high-efficiency silver catalyst, ethylene oxidation technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of catalyst selectivity decline and poor stability , to achieve the effect of improving catalyst performance, improving selectivity, and simple preparation technology

Inactive Publication Date: 2018-06-15
CNOOC TIANJIN CHEM RES & DESIGN INST +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at Ag / Al currently used for ethylene oxidation to ethylene oxide 2 o 3 Catalyst selectivity declines quickly, poor stability and other shortcomings, the present invention discloses an Ag / Al catalyst which has the advantages of high selectivity, good stability and long service life for the reaction of ethylene oxide to ethylene oxide. 2 o 3 Catalyst preparation method

Method used

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  • Preparation method of high-efficiency silver catalyst for preparing ethylene oxide through ethylene oxidation with polypeptide as three-dimensional guiding agent
  • Preparation method of high-efficiency silver catalyst for preparing ethylene oxide through ethylene oxidation with polypeptide as three-dimensional guiding agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 13.5g of silver nitrate and dissolve in 50ml of deionized water to obtain a silver nitrate solution, and dissolve 5.0g of oxalic acid in 20ml of deionized water to obtain an oxalic acid solution. Slowly pour the dissolved silver nitrate solution into the oxalic acid solution to produce a white silver oxalate precipitate. Suction filter the precipitate, wash the filter cake until neutral, dissolve it in a mixed solution of 4.67 g of dipeptide formed by condensation and dehydration of glutamine and lysine at a volume ratio of ethylenediamine and ethanolamine of 4:1, and water to obtain Clear pale yellow-brown complex solution. Weigh 0.5g cesium nitrate and dissolve in 100ml deionized water for later use, weigh 0.25g ammonium perrhenate and dissolve it in 100ml deionized water for later use. Measure 1.8ml of cesium nitrate solution and 1.2ml of ammonium perrhenate solution into the above complex solution and shake well. Weigh 10g of silver carrier A and carry out su...

Embodiment 2

[0039] Weigh 15.0g of silver oxalate, dissolve said silver oxalate in a mixture of 3.72g of polypeptide formed by secondary condensation of asparagine, histidine and alanine, and water with a volume ratio of ethylenediamine and ethanolamine of 3:1 solution, a light yellow complex solution was obtained. Zirconium basic carbonate 1.2g is made into 1ml solution and is poured into the above-mentioned complex solution, and 0.9ml of cesium nitrate solution and 2.3ml of ammonium perrhenate solution are measured and injected into the above-mentioned solution. Weigh 10g of silver carrier A and carry out supersaturated impregnation under vacuum condition for 2h, then filter out the impregnated carrier, age at room temperature for 15h, then dry at 110°C for 4h, and roast at 280°C for 10min in an air atmosphere to obtain the finished catalyst b.

[0040] The composition of catalyst B is: Ag-Cs-Re-Zr / Al 2 o 3 , where the mass percentage of each component in terms of oxides is, Ag 2 O: ...

Embodiment 3

[0043] Weigh 17.0g of silver nitrate, dissolve 8.6g of ammonium oxalate in 100.0g of deionized water heated to 40-60°C to make an ammonium oxalate solution, slowly dissolve the weighed silver nitrate in the ammonium oxalate solution, and produce white silver oxalate precipitate . The precipitate was filtered out and dissolved in a mixed solution of 3.97 g of a polypeptide formed by the dehydration condensation of two lysine and serine at a volume ratio of ethylenediamine to ethanolamine of 4:1 and water to obtain a light blue-black transparent complex solution. Weigh 0.05g of potassium nitrate and 1.5g of zirconium oxynitrate to make 2ml solutions respectively and pour them into the above complex solution, and measure 3.4ml of ammonium perrhenate solution and pour them into the above solution as well. Weigh 10g of silver carrier A and carry out supersaturated impregnation under vacuum condition for 5h, then filter out the impregnated carrier, age at room temperature for 20h, t...

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Abstract

The invention relates to a preparation method of a high-efficiency silver catalyst for preparing ethylene oxide through ethylene oxidation with polypeptide as a three-dimensional guiding agent. Duringpreparation, a certain amount of the loaded three-dimensional guiding agent is added, the loaded three-dimensional guiding agent takes polypeptide formed by two or more amino acids as a silver activeingredient and takes cesium and / or rhenium as active auxiliary agents, silver and other inorganic active components are selectively precipitated on the surface of alpha-Al2O3 to form a membrane distributed with uniform bulges. The preparation method can realize the membrane-like distribution of the active component silver and the like in the silver catalyst without too complicated change of a conventional preparation process and mode. The method has the advantages of simple operation, low cost, strong controllability and easy preparation. The prepared silver catalyst has the advantages of good activity, high selectivity, good stability and the like.

Description

technical field [0001] The invention relates to a high-efficiency silver catalyst for preparing ethylene oxide by ethylene oxidation using polypeptide as a three-dimensional directing agent and a preparation method thereof, especially a catalyst preparation method for improving the activity, stability and selectivity of the catalyst for preparing ethylene oxide by ethylene oxidation. It belongs to the field of catalyst preparation and application. Background technique [0002] At present, EO is mainly produced by the direct oxygen oxidation of ethylene, the gas-solid phase catalytic selective oxidation of ethylene and oxygen under the action of supported silver catalysts. In this reaction system, there are mainly reaction networks as shown below, in which reaction 1 is the main reaction, which is the selective oxidation reaction to generate EO, and reactions 2 and 3 are the main side reactions, which are the deep oxidation reaction of EO and the oxidation of ethylene, respec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68B01J35/02B01J37/02C07D303/04C07D301/10
CPCB01J23/002B01J23/688B01J35/023B01J37/0213B01J37/0219B01J37/0228B01J2523/00C07D301/10C07D303/04B01J2523/15B01J2523/18B01J2523/31B01J2523/74B01J2523/48B01J2523/13Y02P20/52
Inventor 吴同旭蔡奇吴青李晓云孙彦民王栋何杉赵明星
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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