Low-temperature selective catalytic reduction NOx catalyst based on nanometer activated carbon microspheres and preparation method thereof

A nano-activated carbon and selective technology, applied in the direction of physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, etc., can solve SO2 deactivation, reduce the stability of sulfates, Catalyst deactivation and other problems, to achieve the effect of easy electron transfer, easy utilization of interlattice oxygen, and lower operating temperature

Inactive Publication Date: 2013-06-05
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it has been reported that TiO 2 As a carrier, it can reduce the stability of sulfates on the surface of the catalyst and protect the active material, thereby improving the sulfur resistance of the catalyst. However, TiO 2 Supported catalysts still have SO

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Using ultrasonic atomization decomposition method, with glucose, TiCl 4 、NaNO 3 , Mn(NO 3 ) 2 , water as raw material, the addition of each component is as follows, glucose, TiCl 4 、NaNO 3 , Mn(NO 3 ) 2 =0.05mol, 0.024mol, 0.1mol, 0.006mol, add 100ml water, Mn(NO 3 ) 2 The addition amount is Mn:glucose molar ratio=0.12, and the pH value of the solution after mixing is 2, and after the solution is ultrasonically atomized into an aerosol, it is mixed with N 2 As a carrier gas, it is passed into a tube furnace, roasted at 450°C, and the residence time in the tube furnace is 10s to obtain the catalyst Mn(0.12)-TiO 2 (0.48) CNS.

[0037] Application treatment NO:NH 3 =1,O 2 Concentration = 3%, GHSV (gas space velocity per hour) = 30000h -1 The SCR flue gas denitrification method, when the reaction temperature is 120 ℃, the catalytic efficiency is about 90%, adding 50ppm SO 2 After that, the catalytic efficiency was 70%.

Embodiment 2

[0039] Using ultrasonic atomization decomposition method, glucose, n-butyl titanate, NaNO 3 , Fe(NO 3 ) 3 , water as raw material, the addition of each component is as follows, glucose, n-butyl titanate, NaNO 3 , Fe(NO 3 ) 3 =0.05mol, 0.06mol, 0.1mol, 0.012mol, add 100ml water, Fe(NO 3 ) 3 The added amount is Fe:glucose molar ratio = 0.24, the pH value of the solution after mixing is 1, after the solution is ultrasonically atomized into an aerosol, it is passed into a tube furnace with Ar as a carrier gas, and roasted at 700 ° C. The residence time in the furnace is 10s, and the catalyst Fe(0.24)-TiO 2 (1.2) CNS.

[0040] Application treatment NO:NH 3 =1,O 2 Concentration = 3%, GHSV (gas space velocity per hour) = 30000h -1 The flue gas denitrification of the SCR method, when the reaction temperature is 150 ° C, the catalytic efficiency is about 85%, adding 50ppm of SO 2 After that, the catalytic efficiency was 65%.

Embodiment 3

[0042] Using ultrasonic atomization decomposition method, with sucrose, TiCl 4 , NaCl, FeCl 3 , water as raw material, the addition of each component is as follows, sucrose, TiCl 4 , NaCl, FeCl 3 =0.05mol, 0.1mol, 0.2mol, 0.0325mol, add 100ml water, FeCl 3 The addition amount is Fe: sucrose molar ratio=0.65, and the pH value of the solution after mixing is 1, and after the solution is ultrasonically atomized into an aerosol, the solution is mixed with N 2 As a carrier gas, it is passed into a tube furnace and roasted at 900 ° C. The residence time in the tube furnace is 10 s to obtain the catalyst Fe(0.65)-TiO 2 (2) CNS.

[0043] Application treatment NO:NH 3 =1,O 2 Concentration = 3%, GHSV (gas space velocity per hour) = 30000h -1 The flue gas denitrification of the SCR method, when the reaction temperature is 180 ° C, the catalytic efficiency is about 50%, adding 50ppm of SO 2 After that, the catalytic efficiency is 41%

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Abstract

The invention discloses a low-temperature selective catalytic reduction NOx catalyst based on nanometer activated carbon microspheres and a preparation method of the low-temperature selective catalytic reduction NOx catalyst based on the nanometer activated carbon microspheres. The preparation method comprises the following steps of dissolving saccharides, titanium compounds, alkali metal salts and transition metal salts in water according to a molar concentration ratio of 1: 0.01-4:0.5-3:0.01-1 to obtain mixed solution, and adjusting the pH value of the mixed solution into 1-3; and atomizing the mixed solution into aerosol in an ultrasonic way, then inputting N2 or Ar as carrier gas into a tube furnace, conducting calcinations in 300-900 celsius degrees, and obtaining the low-temperature selective catalytic reduction NOx catalyst based on the nanometer activated carbon microspheres. According to the low-temperature selective catalytic reduction NOx catalyst, operation temperature of selective catalytic reduction (SCR) is lowered, and in the SCR technology, a high NO removal rate can be reached below 150 celsius degrees when NH3 is as catalyst. Moreover, when SO2 is contained in a system, higher catalytic efficiency is still kept, and poisoning of SO2 to the system has recoverability.

Description

technical field [0001] The invention relates to a catalyst used in the technical field of air pollution control, in particular to a MO based on nano activated carbon microspheres prepared by ultrasonic atomization decomposition method x Low-temperature Selective Catalytic Reduction of NO by CNS x catalyst. Background technique [0002] After years of research and practice, using NH 3 SCR flue gas denitrification as a reducing agent has become increasingly mature, and the SCR catalysts for industrial applications are mainly V 2 o 5 -WO 3 / TiO 2 (V 2 o 5 -MoO 3 / TiO 2 ), the operating temperature range of this type of catalyst is roughly between 300 and 400 °C, and it is placed before the desulfurization and dust removal device. In practical applications, such catalysts have anti-SO 2 The advantages of strong ability and stable operation. [0003] However, due to the high operating temperature required by industrial catalysts, the SCR denitration device must be pla...

Claims

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Application Information

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IPC IPC(8): B01J31/38B01D53/86B01D53/56
Inventor 江博琼姚水良吴祖良唐秀娟陆豪
Owner ZHEJIANG GONGSHANG UNIVERSITY
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