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Preparation method of sulphur-resisting low temperature selectivity catalytic reduction nitric oxide catalysts

A nitrogen oxide and selective technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low sulfur resistance

Active Publication Date: 2013-10-16
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the catalyst system in the existing SCR technology that it is difficult to function at low temperatures and have low sulfur resistance, and to prepare a high-efficiency SCR that can be used between 100 and 300 ° C and has high sulfur resistance. Catalyst, which can effectively catalyze NH in the lower temperature range 3 and NO x Generate N 2 response, and can tolerate SO in the system 2 to provide a new type of denitrification catalyst for the treatment of common low-temperature NOx-containing exhaust gas in my country

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Dissolve 0.2 mol of chromium (III) nitrate and 0.8 mol of cerium nitrate in 500 mL of deionized water, and put a cuboid cordierite porous ceramic carrier whose length, width, and height are 10 cm, 10 cm, and 5 cm, respectively, into it and soak for 1 hr. The hole size is 1mm, and the specific surface is 2000m 2 / m 3 , and then take it out and dry it at 80°C, and then burn it in a muffle furnace at 400°C for 2 hours in an air atmosphere to obtain a low-temperature selective catalytic reduction catalyst for nitrogen oxides with low air resistance.

Embodiment 2

[0013] Dissolve 0.1mol of ammonium metavanadate, 0.3mol of citric acid, 0.2mol of chromium (III) sulfate and 0.1mol of cerium chloride in 40L of deionized water, and make a rectangular parallelepiped whose length, width and height are 15cm, 15cm and 10cm respectively. The cordierite porous ceramic carrier is put into it and impregnated for 0.5hr, the pore size of the cordierite carrier is 2mm, and the specific surface is 500m 2 / m 3 , and then take it out and dry it at 100°C, then burn it in a muffle furnace at 600°C in an air atmosphere for 5 hours, repeat the above impregnation, drying and burning steps 4 times, and obtain a sulfur-resistant low-temperature selective catalytic reduction of nitrogen with low air resistance oxide catalyst.

Embodiment 3

[0015] Dissolve 1 mol of ammonium metavanadate, 1 mol of citric acid, 0.5 mol of chromium (III) chloride and 5 mol of cerium sulfate in 6L of deionized water, and make porous cuboid cordierite with length, width and height of 50 cm, 50 cm and 10 cm The ceramic carrier is put into it and immersed for 1hr. The pore size of the cordierite carrier is 10mm, and the specific surface is 160m 2 / m 3 , then take it out and dry it at 90°C, then burn it in a muffle furnace at 500°C in an air atmosphere for 4hrs, repeat the above impregnation, drying and burning steps for 6 times, to obtain a sulfur-resistant low-temperature selective catalytic reduction of nitrogen with low air resistance oxide catalyst.

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PUM

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Abstract

The invention relates to a preparation method of sulphur-resisting low temperature selectivity catalytic reduction nitric oxide catalysts, which belongs to the technical field of material preparation and waste gas treatment. In the method, chrome, cerium and vanadium are adopted as main components, and NH3 can be effectively catalyzed to reduce NOx into N2 at a low temperature through dipping, drying and firing. The catalyst has high low temperature activity, can be used at the temperature between 100 DEG C and 350 DEG C, and can tolerate the interference of coexisting SO2 in flue gas, thereby having better application prospects in denitration operation of low-temperature sulfur-containing flue gas.

Description

technical field [0001] The invention relates to a preparation method of a sulfur-resistant low-temperature selective catalytic reduction nitrogen oxide catalyst, which belongs to the technical field of material preparation and waste gas treatment. Background technique [0002] NO in coal-fired boiler flue gas x Pollution control has always been a focus of attention, and denitrification technologies such as selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR) have been developed to control NO x (Thermal Power Generation, 2006, 35(11): 59-60, 64; Electric Power Environmental Protection, 2006, 22(6): 37-39), and relatively mature technologies have been put into use. However, unlike the coal-fired boiler flue gas, the sintering flue gas in the iron and steel industry is difficult to be treated directly by SNCR or SCR technology, because firstly: the temperature of the sintering flue gas is low (<150°C) and it is difficult to reach the window tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/26B01J37/02B01D53/90B01D53/56
Inventor 刘海弟李伟曼陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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