Method for reducing loaded metal catalyst using low temperature plasma

A low-temperature plasma, metal-loaded technology, used in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as unsuitable industrial applications, achieve strong reduction performance, simple process, and avoid adverse thermal effects Effect

Inactive Publication Date: 2005-08-03
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using high temperature or plasma sputtering to deposit metal atoms on the carrier generally requires the use of volatile metal

Method used

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  • Method for reducing loaded metal catalyst using low temperature plasma
  • Method for reducing loaded metal catalyst using low temperature plasma
  • Method for reducing loaded metal catalyst using low temperature plasma

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] with TiO 2 as a carrier, impregnated with H 2 PtCl 6 solution, the content of metal Pt is 0.5%; stand for 24 hours, and dry at 100°C for 4 hours; the catalyst is reduced by corona discharge plasma, the catalyst is placed between the two plate electrodes of the discharge tube, airtight, the system is evacuated, and the Enter Ar as the discharge gas, maintain the pressure of 200Pa, apply a DC voltage of 1000V on the electrode, and the reduction time is 30 minutes.

Embodiment 2

[0023] Basically the same as Example 1, but La 2 o 3 As a carrier, impregnated with Ni(NO 3 ) 2 solution, the content of metal Ni is 7.0%; N 2 As discharge gas, the pressure is 50Pa, the voltage is 500V DC, and the reduction time is 45 minutes; then impregnate Fe(NO 3 ) 3 Solution, the content of the second metal Fe is 3.0%, repeat the previous treatment steps.

Embodiment 3

[0025] It is basically the same as Example 1, but gac is the carrier, PdCl 2 Dissolve in hydrochloric acid solution, then evaporate the solution until nearly dry, then add deionized water to form a solution, and then impregnate, the content of metal Pd is 20.0%; He is used as discharge gas, the pressure is 1000Pa, the voltage is 5000V DC, and the reduction time is 120 minutes .

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Abstract

The method of reducing loaded metal catalyst with low temperature plasma includes the steps of: 1) dissolving active metal salt component in deionized water or distilled water to form solution with metal component content of 0.01-20 wt%, filling solution into catalyst carrier, letting stand at room temperature for 8-24 hr and drying at 40-110 deg.c for 2-10 hr; and 2) setting the catalyst between two electrodes of plasma apparatus, introducing inert gas, air or oxygen as plasma discharge gas into discharge tube of pressure of 50-10000 Pa, and applying DC or AC voltage of 100-20000 V across the electrodes to process for 5-200 min. The low temperature plasma contains great amount of electrons, has powerful reducing capacity to reduce metal ion into metal simple substance and has no negative reaction appearing at high temperature. The process is simple, short in reduction time, without need of chemical reductant and environment friendly.

Description

technical field [0001] The invention belongs to a method for preparing a supported catalyst, in particular to a method for reducing a supported metal catalyst by using low-temperature plasma. Background technique [0002] Supported metal catalysts are commonly used catalysts in the chemical industry. Through loading, generally by impregnation, the expensive metal active components can be evenly dispersed on the surface of the carrier, thereby saving the amount of metal used and improving the activity of the catalyst. In most cases, it is the simple metal that has the catalytic effect. Therefore, the metal salt loaded on the catalyst carrier needs to be reduced to the simple metal before use. Usually, hydrogen is used for reduction at high temperature, but this method often causes the agglomeration of metal particles, resulting in uneven dispersion of the metal, reduced dispersion, and low activity. In addition, high temperature may have a...

Claims

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Application Information

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IPC IPC(8): B01J37/16
Inventor 刘昌俊邹吉军张月萍
Owner TIANJIN UNIV
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