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MnOx/ZrO2-TiO2 low temperature selective catalytic reduction NOx catalyst possessing anti SO2 performance and its preparation technology

A catalyst and selective technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as catalyst poisoning, reduce operating temperature, and reduce deposition , the effect of high catalytic efficiency

Active Publication Date: 2007-07-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there is still some SO after desulfurization 2 Existence, in long-term exposure, will still have a poisoning effect on the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Using the sol-gel method, n-butyl titanate, ethanol, water, Mn(NO 3 ) 2 , ZrOCl 2 , acetic acid as raw material, the volume ratio of each component is as follows, n-butyl titanate: ethanol: water: acetic acid = 1: 1.5: 0.5: 0.5, Mn(NO 3 ) 2 The amount added is Mn:Ti=0.4, ZrOCl 2 The addition amount is: Zr:Ti=1, mixed, after the sol is transformed into a gel, dried, ground, and roasted at 200-600°C to obtain the catalyst.

[0022] 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 120 ° C, the catalytic efficiency is about 90%, adding 150ppm of S0 2 After that, the catalytic efficiency was 75%.

Embodiment 2

[0024] Using the sol-gel method, tetraethoxytitanium, ethanol, water, Mn(NO 3 ) 2 , ZrCl 4 , Nitric acid is raw material, and the volume ratio of each component is as follows, tetraethoxytitanium: ethanol: water: nitric acid=1: 1.65: 0.05: 0.07, Mn: Ti=0.4, ZrCl 4 The addition amount is: Zr:Ti=1, mixed, after the sol is transformed into a gel, dried, ground, and roasted at 200-600°C to obtain the catalyst.

[0025] 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 150 ° C, the catalytic efficiency is about 90%, adding 150ppm of SO 2 After that, the catalytic efficiency was 72%.

Embodiment 3

[0027] Using the sol-gel method, n-propyl titanate, propanol, water, Mn(NO 3 ) 2 , Zr(NO 3 ) 4 , nitric acid as raw material, n-propyl titanate:propanol:water:volume ratio of nitric acid=1:1.85:0.06:0.02, Mn(NO 3 ) 2 The amount added is: Mn:Ti=0.4, Zr(NO 3 ) 4 The added amount is: Zr:Ti=0.5, mixed, after the sol is transformed into a gel, dried, ground, and roasted at 200-600°C to obtain the catalyst.

[0028] 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 ° C, the catalytic efficiency is about 80%, adding 150ppm of SO 2 After that, the catalytic efficiency was 65%.

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Abstract

A catalyst MnOx / ZrO2-TiO2 with thd SiO2-resistant performance for selectively catalytic reduction to NOx at low temp is proportionally prepared from titanium alkoxide, alcohol-type solvent, water, protonic acid, the soluble salt of Mn, and the soluble salt of Ar through proortional mixing, stirring until the sol becomes gel, drying, grinding and high-temp calcining. Its NO removing rate at 150 deg.C is more than 90%.

Description

technical field [0001] The invention relates to a catalyst used in the technical field of air pollution control, in particular to a MnO-based catalyst with sulfur resistance prepared by a sol-gel method. x / ZrO 2 -TiO 2 Systematic low temperature selective catalytic reduction of NO 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 placed before ...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J21/06B01D53/56
Inventor 吴忠标江博琼刘越王海强金瑞奔
Owner ZHEJIANG UNIV
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