Physical process of reducing supported metal catalyst

Abstract

The physical process of reducing supported metal catalyst includes the following steps: 1. soaking to load metal compound in the content of 0.05-20 wt% onto the surface of the carrier, and drying at room temperature for 2-24 hr; 2. reducing the catalyst in gas discharge area with discharge gas of inert gas, air, oxidizing gas or reducing gas at pressure 50 Pa-0.1 MPa, DC or AC voltage of 500-20000 V for initiating gas discharge for 15-200 min; and the optional step 3. roasting the catalyst under inert gas protection at 150-600 deg.c for 1-10 hr. The gas discharge generates great amount of high energy electrons to reduce the metal compound into metal substance. The process is simple, fast, effective, and environment friendly without using chemical reductant.

Description

technical field [0001] The invention belongs to a method for reducing supported metal catalysts. In particular, it relates to a physical method for reducing supported metal catalysts. Background technique [0002] Supported metal catalysts are widely used in modern chemical industry, energy and environmental protection. Evenly dispersing the metal active components on the surface of the carrier can improve the efficiency and reduce the cost. In most cases, the metal in the reduced state is the catalytic active center, and the metal is often loaded on the surface of the carrier in the form of a compound. Therefore, the catalyst needs to be reduction. The reduction catalyst needs to use a reducing agent, which can be roughly divided into the following categories according to different reducing agents: (1) hydrogen reduction. This method is the most widely used, and uses hydrogen to reduce the metal compound to a simple substance under the con...

AI Technical Summary

Problems solved by technology

Use strong reducing chemicals in solution, such as NaBH 4 , hydrazine, etc. to reduce the metal compound to metal particles and adsorb on the surface of the carrier. The disadvantages of this method are: the operation is complicated, the metal cannot be completely adsorbed on the surface of the carrier, the loading amount is not easy to accurately control, and the above-mentioned reducing agent is harmful to the environment.

Using microbial cells to reduce metal ions to simple metals is a selective method, and different metal ions need to use different strains, while the screening and cultivation period of biological cells is very long, making it difficult to apply on a large scale

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