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Plant reduction preparation method of load-type silver catalyst

A supported silver and catalyst technology, which is applied in the direction of catalyst carriers, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of the reduction preparation process of silver single substance particles with less active components, and achieve the effect of uniform distribution

Inactive Publication Date: 2010-12-01
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As mentioned above, the current research on the preparation technology of silver catalysts for the synthesis of ethylene oxide by ethylene epoxidation mainly focuses on the preparation and modification of the carrier, the selection and addition of additives, and the heat treatment method of the catalyst. , and seldom start with the reduction preparation process of the active component silver particles

Method used

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  • Plant reduction preparation method of load-type silver catalyst
  • Plant reduction preparation method of load-type silver catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The leaves of Cinnamomum camphora were dried and pulverized in a blast oven at 60°C. Weigh 1.25g of Cinnamomum camphora leaf powder, disperse in 5mL of deionized water (that is, the leaf / water ratio is 0.25g / mL), shake and extract at room temperature for 6h, centrifuge at 12000rpm for 3min, and remove the centrifuged lower leaf powder residue , leave the supernatant (both cinnamon camphor leaf extract) for subsequent use. Weigh 0.278g of silver nitrate, dissolve it in 1.25mL of cinnamomum camphora leaf extract, add 1g of 20-40 mesh α-alumina, and react at room temperature for 24h. The catalyst precursor was then placed in a vacuum oven at 50 °C for 15 h, and dried under N 2 The catalyst was activated at 600° C. for 60 min in the atmosphere to prepare a catalyst with a silver loading of 15 wt % (calculated based on the total mass of the catalyst).

[0022] Catalyst ethylene epoxidation reaction performance test: Take 1mL catalyst and put it into a stainless steel react...

Embodiment 2

[0025] The cinnamon leaves are dried in the sun and crushed. Weigh 1g of Cinnamomum camphora leaf powder, disperse it in 5mL of deionized water (that is, the leaf / water ratio is 0.20g / mL), shake and leach for 5h at room temperature, centrifuge at 12000rpm for 3min, and remove the centrifuged lower leaf powder residue. Leave the supernatant (that is, the extract of cinnamon camphor leaves) for future use. Weigh 0.278g of silver nitrate, dissolve it in 1.25mL of cinnamomum camphora leaf extract, add 1g of 20-40 mesh α-alumina, and react at room temperature for 18h. Afterwards, the catalyst precursor was dried in a vacuum oven at 50 °C for 20 h, and dried under N 2 Activated at 600° C. for 60 min in the atmosphere to prepare a catalyst with a silver loading of 15 wt %.

[0026] The ethylene epoxidation reaction performance test procedure of the catalyst is the same as in Example 1, and the results are shown in Table 1.

Embodiment 3

[0028] The leaves of Cinnamomum camphora were dried and pulverized in a blast oven at 60°C. Weigh 0.50g of Cinnamomum camphora leaf powder, disperse in 5mL of deionized water (that is, the leaf / water ratio is 0.10g / mL), shake and leach at room temperature for 10h, remove the leaf powder residue by suction filtration and obtain Cinnamomum camphora leaf extract spare. Weigh 0.278g of silver nitrate, dissolve it in 1.25mL of cinnamomum camphora leaf extract, add 1g of 20-40 mesh α-alumina, and react at room temperature for 18h. Afterwards, the catalyst precursor was dried in a vacuum oven at 50 °C for 20 h, and dried under N 2 Activated at 600° C. for 30 minutes in the atmosphere to prepare a catalyst with a silver loading of 15 wt %.

[0029] The ethylene epoxidation reaction performance test procedure of the catalyst is the same as in Example 1, and the results are shown in Table 1.

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Abstract

The invention discloses a plant reduction preparation method of a load-type silver catalyst, relating to a silver catalyst and providing a plant reduction preparation method of a load-type silver catalyst. The method comprises the following steps of: drying and crushing plant blades into powder, mixing with water and leaching, and removing residues to obtain a plant extract; dissolving silver salts in the plant extract, preparing into a dipping solution, soaking a vector with the dipping solution, and reacting to obtain the catalyst; and carrying out drying and activation on the catalyst to prepare the load-type silver catalyst which can be used for ethylene epoxidation. In the invention, the natural plant blade extract is adopted as a reducing agent without adding other solvents and reducing agents and loading a cocatalyst, an inhibitor is not added in reaction feed gas, and under the simulated industrial reaction conditions with the lower temperature of 225 DEG C, the selectivity of the catalyst to ethylene oxide reaches 81.96 percent which approaches to the index of an industrial catalyst. The preparation process of the catalyst is green; and silver particles on the catalyst vector are evenly distributed.

Description

technical field [0001] The invention relates to a silver catalyst, in particular to a method for preparing a silver catalyst for ethylene epoxidation by using a plant extract to reduce it. Background technique [0002] Ethylene oxide (EO) is the second largest organic chemical product among ethylene derivatives, and it is also an important organic chemical intermediate and raw material, and it can be used as a fungicide, anti-acid agent and fuel. The supported silver catalyst is widely used in the industry to produce ethylene oxide by the direct oxidation of ethylene. The catalyst usually uses α-alumina as the carrier, silver as the main active component, and a small amount of promoter added at the same time. Activity, selectivity and stability are the main performance indicators of silver catalysts, and the performance of catalysts is usually closely related to the size of silver particles and their dispersion on the support surface. [0003] In the prior art, the preparat...

Claims

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Application Information

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IPC IPC(8): B01J23/50B01J32/00B01J35/02C07D301/10
Inventor 李清彪王惠璇王慧林文爽杨欣孙道华贾立山黄加乐林玲杜明明
Owner XIAMEN UNIV
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