Preparation method of crystal silver catalyst

A technology of silver catalyst and crystalline silver, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., and can solve problems such as poor thermal conductivity and troublesome regeneration

Inactive Publication Date: 2004-03-03
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alcohol gas-phase oxidation reaction is a strong exothermic reaction, which requires good thermal conductivity of the catalyst. The thermal conductivity of crystalline silver is very good, while the thermal conductivity of loaded silver is much worse.
In addition, as a relatively expensive metal, silver is required to be easily regenerated. After deactivation of crystalline silver, it can be easily regenerated by electrolysis as an anode without pollution, while the regeneration of loaded silver is much more troublesome.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] 1. This example provides an existing crystalline silver preparation technology and its application as a comparison. Prepare a 5% silver nitrate solution as the electrolyte, electrolyze the metallic silver with a content of 99.99% as the anode, and use the metallic silver plate as the cathode. The electrolysis temperature is 60°C and the current density is 8A / dm 2 ,, The silver precipitated at the cathode is electrocrystallized silver, after washing and drying, bake at 600°C for 2 hours to obtain electrocrystallized silver catalyst.

[0022] Put 5 grams of electrocrystallized silver catalyst into a stainless steel reactor with a diameter of 14mm, pump 1,2-propanediol aqueous solution into the gasifier with a metering pump, mix with preheated air, and then enter the catalytic bed after heating To react, the liquid hourly space velocity of 1,2-propanediol is 30hr -1 , the air feed flow rate is 0.055M 3 / h, the reaction temperature is 580°C, the product is quenched and ab...

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Abstract

A preparation method of crystal silver catalyst adopts composite electrolysis method, i.e, utilizes metal electrodeposition method to make one or several insoluble solid granules uniformly included in metal electrolyzed. The electrocrystallized silver catalyst prepared by adopting the said method possesses the following advantages: its melting point is raised, its catalyst granules not are easy subject to aggregation or sinter, and its thermal stability also is raised.

Description

technical field [0001] The invention relates to a preparation method of a crystalline silver catalyst, which can be used for gas-phase oxidation of alcohols to produce corresponding aldehydes and ketones, such as the synthesis of formaldehyde by gas-phase oxidation of methanol, the synthesis of glyoxal by gas-phase oxidation of ethylene glycol, and the synthesis of acetone by gas-phase oxidation of ethyl lactate Acetate ethyl ester, phenylethanol vapor phase oxidation synthesis phenylacetaldehyde and so on. Background technique [0002] Crystalline silver has been used for many years as a catalyst for synthesizing corresponding aldehydes or ketones by gas-phase oxidation of alcohols. Usually, crystalline silver catalysts are prepared by electrolysis. U.S. Patent No. 5,135,624 describes the use of silver nitrate of 5 to 100 g / L as the electrolyte, pH 1 ~4, electrolysis temperature 10~80℃, current density 100~3000A / m 2 A method for preparing an electrocrystallized silver cata...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/48C25C1/20
Inventor 沈伟徐华龙
Owner FUDAN UNIV
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