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Process for preparing carried silver catalyst by chemical plating

A silver catalyst, electroless plating technology, applied in physical/chemical process catalysts, chemical instruments and methods, catalyst activation/preparation and other directions, can solve the problem of low cost and achieve the effect of low cost, improved activity and strong binding force

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

At present, there is no preparation method of this type of catalyst with simple process, low cost, and stable combination of silver and carrier.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] 1. Dissolve silver nitrate in distilled water to make a solution of 0.05mol / L, then slowly add ammonia water while stirring, first, brown silver hydroxide precipitate and dark brown silver oxide precipitate are formed, and colorless transparent silver is formed after adding excess ammonia water Ammonia complex solution, the molar ratio of excess ammonia to silver ammine ions is 1. Add reducing agent formaldehyde in another distilled aqueous solution, the molar ratio of formaldehyde and silver ammine ion is 2, adjust alkalinity with NaOH, make NaOH concentration be 0.4mol / L. After the above two solutions are mixed evenly, the electroless plating solution is obtained. Put the NaY type molecular sieve as carrier into the electroless plating solution for electroless plating, after plating, filter, dry and bake at 450°C for 5 hours to obtain the supported silver catalyst.

[0018] Put 5 grams of catalyst into a stainless steel reactor with a diameter of 14mm, inject the 1,2...

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Abstract

A process for preparing the silver carried catalyst is characterized by that the silver and one or more kinds of insoluble solid particles are chemically plated onto the porous carrier. Its advantages are high uniformity of silver and adhesion of silver to carrier, high stability and high activity.

Description

technical field [0001] The invention relates to a method for preparing a supported silver catalyst by electroless plating. The catalyst can be used for the oxidation of alcohol 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 glyoxal, and the synthesis of ethyl lactate by gas-phase oxidation. Ethyl pyruvate, phenylethanol gas-phase oxidation synthesis of phenylacetaldehyde and so on. Background technique [0002] Supported silver has been used for many years as a catalyst for the oxidation of ethylene to ethylene oxide and alcohol oxidation to the corresponding aldehydes and ketones. Supported silver is made by distributing silver on the surface of an inert material, that is, a carrier. Usually, the carrier is porous , Insoluble spherical, ring or flake, supported silver catalysts are used in many chemical reactions, such as hydrogenation, cracking, deh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J37/02
Inventor 徐华龙沈伟
Owner FUDAN UNIV