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Process for preparing chlorine blended metal oxide catalyst

A technology of oxide and chlorine doping, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., and can solve the problems of low activity and easy poisoning of metal oxides

Inactive Publication Date: 2006-03-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for preparing chlorine-doped metal oxide catalysts for the problems of low metal oxide activity and easy poisoning. This preparation method has the advantages of simple process and low production cost

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  • Process for preparing chlorine blended metal oxide catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 33.9 mg of ammonium chloride and 0.727 g of cobalt nitrate in a 50 ml beaker, add 25 ml of deionized water to dissolve to obtain a mixed solution, weigh 3.6 g of alumina, soak in the above solution for 6 hours, and filter to obtain a catalyst precursor. The catalyst precursor was dried in an oven at 60° C. for 8 hours, and the moisture was evaporated to obtain a dried catalyst precursor. Then, in the muffle furnace, the temperature was raised to 100° C. at a rate of 5° C. / minute, and kept for 0.5 hours to obtain a chlorine-doped cobalt metal oxide catalyst with high catalytic activity.

[0028] The mercury oxidation performance test of the chlorine-doped cobalt metal oxide catalyst adopts a fixed reaction bed. The fixed reaction bed uses a quartz glass tube with a diameter of 6 mm, and 5 mg of quartz wool is blocked in the middle of the quartz tube. The concentration of mercury in the gas is controlled using a mercury permeation tube. Concentration of elemental m...

Embodiment 2

[0030] Pour 15ml of hydrogen chloride aqueous solution (0.1mol / L) and 5ml of ferric oxalate solution with a concentration of 0.2g / ml into a 50ml beaker and mix to obtain a mixed solution, add 0.3g of ethylene glycol and stir to obtain a gel precursor solution, add Stir 5.4g of activated carbon evenly and place it in the air to dry naturally to obtain a catalyst precursor. Place the catalyst precursor in a muffle furnace and raise the temperature to 300°C at a rate of 20°C / min, keep it for 5 hours and then cool to obtain high catalytic activity. Chlorine-doped iron metal oxide catalysts.

Embodiment 3

[0032] 3.7mg HClO 3 Dissolve 0.464g of cobalt acetate and 0.602g of copper carbonate in 50ml of water, add 0.9g of citric acid, and stir well to obtain a gel precursor solution. Add 3.5g of molecular sieves to the above precursor solution, and then put it in an oven at 100°C drying to obtain a chlorine-doped cobalt-copper-oxygen composite metal oxide precursor. The chlorine-doped cobalt-copper-oxygen composite metal oxide precursor is placed in a muffle furnace and heated at a rate of 40°C / min to 800°C for 2 hours to obtain the chlorine-doped cobalt-copper-oxygen composite metal oxide.

[0033] Catalytic activity test is with embodiment 1, and test result sees figure 1 , where the curve CoCu is the change with time of the ratio of the concentration of element mercury at the outlet of the reaction bed to the concentration of element mercury at the inlet when the catalyst is no cobalt-copper-oxygen composite metal oxide. The ratio of the concentration of elemental mercury at t...

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Abstract

The preparation process of chlorine doped metal oxide catalyst includes the following steps: dissolving metal oxide precursor and chlorine dopant in certain ratio in water to obtain mixture solution; adding dispersant in 0-3 times the molar amount of metal oxide precursor and chlorine dopant into the solution to obtain gel precursor solution; soaking catalyst carrier in 1-100 times the weight of metal oxide precursor and chlorine dopant inside the gel precursor solution and drying to obtain catalyst precursor; and calcining in air atmosphere at 100-800 deg c to obtain the chlorine doped metal oxide catalyst. The chlorine doped metal oxide catalyst has very high mercury catalytically oxidizing capacity, and has simple preparation process and industrial application foreground.

Description

technical field [0001] The invention relates to a method for preparing a chlorine-doped metal oxide catalyst. The prepared catalyst can be applied to flue gas mercury removal, and belongs to the technical fields of inorganic catalytic materials, environmental protection and energy saving. Background technique [0002] After investigation, the U.S. Environmental Protection Agency believes that coal-fired power plants are currently the largest source of mercury emissions that have not been controlled by humans. Considering the huge amount of mercury emissions from power plants and the accumulation of mercury in fish, it is believed that it is necessary to control it. [0003] Oxidized mercury is easy to control and is not global, so the current mercury control technology mainly focuses on increasing the oxidation state ratio of mercury in flue gas, whether it is activated carbon adsorption injection (ACI), wet flue gas desulfurization (WFGD) method, low temperature Net electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/02B01J37/04B01J37/22B01J27/10B01D53/86B01D53/64
Inventor 王文华梅志坚申哲民程金平袁涛
Owner SHANGHAI JIAO TONG UNIV
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