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Preparation method for low-temperature sulfur-resistant denitration catalyst

A denitrification catalyst and low-temperature technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of catalyst denitrification activity reduction and deactivation

Inactive Publication Date: 2018-04-06
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

But on SO 2 In the presence of

Method used

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  • Preparation method for low-temperature sulfur-resistant denitration catalyst
  • Preparation method for low-temperature sulfur-resistant denitration catalyst

Examples

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Embodiment 1

[0014] Example 1 0.05Fe-doped TiO 2 Loaded iron-manganese composite oxide denitration catalyst.

[0015] 20ml of butyl titanate and 70ml of absolute ethanol were mixed to prepare liquid A; 1.19g of ferric nitrate (Fe(NO 3 ) 3 9H 2 O) Solutions are mixed to prepare solution B. Slowly drop liquid A into liquid B, heat it in a water bath at 60°C, stir and reflux, remove the reflux device after adding all liquid A, continue stirring to evaporate water, and make iron-titanium composite organic gel. Put the iron-titanium composite organogel at room temperature for 16 hours, then put it in a drying oven, and dry it at 120°C for 12 hours to obtain a dry glue, and put the dry glue in H 2 The catalyst carrier was obtained by keeping the temperature at 500° C. for 4 hours in an atmosphere sintering furnace. use N 2 The BET specific surface area of ​​the carrier measured by the adsorption-desorption method is 105.27m 2 / g.

[0016] Weigh 5g carrier, 3.62g Fe(NO 3 ) 3 9H 2 O and...

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Abstract

The invention belongs to the technical field of chemical industry, and provides a preparation method for a low-temperature sulfur-resistant denitration catalyst. The invention solves the problem of denitration for flue gas containing a small amount of SO2 at a low temperature in the prior art. The catalyst provided by the invention is an iron doped modified TiO2 loaded iron-manganese composite oxide catalyst, wherein the molar ratio of doped iron to TiO2 is 0.01: 1 to 0.5: 1; the doped iron and the TiO2 are doped through a sol-gel method and calcined in a reducing atmosphere to prepare a carrier; and 10% (a mass ratio with the carrier, similarly hereinafter) of Fe and 10% of Mn are loaded through an impregnation method. The denitration catalyst prepared by using the method provided by theinvention has the advantages of large specific surface area, high heat stability, high denitration efficiency, good sulfur resistance, and applicability to the field of removal of nitrogen oxides in the flue gas containing a certain amount of SO2. Laboratory simulation flue gas evaluation results show that the removal rate of NO reaches 75% or above under the conditions of a space velocity of 30000 h<-1>, NO of 1000 ppm and SO2 of 100 ppm at a temperature in a range of 160 to 250 DEG C; and the removal rate of NO can reach 92% or above under the condition of no SO2 at 160 to 250 DEG C.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a preparation method of a low-temperature sulfur-resistant denitrification catalyst, in particular to a preparation method of a sulfur-resistant denitrification catalyst with a high specific surface area and an adjustable active component valence state. Background technique [0002] Nitrogen oxide (NOx) is an important pollutant, and its emission into the atmosphere will cause a series of environmental problems such as acid rain, photochemical smog, ozone layer thinning and global warming. Therefore, the governments of various countries have proposed strict limit values ​​for NOx in exhaust emissions. In the pollutant emission standards of various industries promulgated by my country after 2011, the emission limit value of NOx has dropped to 500mg / m 3 , even reduced to 200mg / m in special areas 3 . Therefore, NOx removal has become the primary problem of pollutant contr...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J37/02B01J37/08B01D53/86B01D53/56
CPCB01D53/8628B01J23/8892B01J37/0201B01J37/08
Inventor 陈红萍梁英华齐雪杨旭郭红霞
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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