Rare-earth modified sulfur-resisting low-temperature SCR catalyst and preparing method thereof

A technology of SCR catalyst and rare earth modification, which is applied in chemical instruments and methods, chemical elements of heterogeneous catalysts, physical/chemical process catalysts, etc., can solve the problems that catalysts do not involve molding and subsequent treatment, and achieve excellent catalyst activity and Anti-sulfur performance, reduced cost and energy consumption, simple preparation process and production conditions

Active Publication Date: 2016-08-03
展宗城
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The doping of Br- increases the acidic sites of the catalyst, improves the denitrification efficiency and sulfur resistance of the catalyst, and further prolongs the se...

Method used

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  • Rare-earth modified sulfur-resisting low-temperature SCR catalyst and preparing method thereof
  • Rare-earth modified sulfur-resisting low-temperature SCR catalyst and preparing method thereof
  • Rare-earth modified sulfur-resisting low-temperature SCR catalyst and preparing method thereof

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preparation example Construction

[0049] A preparation method of a rare earth-modified sulfur-resistant low-temperature SCR catalyst, comprising the following steps: S1 preparing catalyst powder:

[0050] S101 Add deionized water to the reaction kettle and heat to 40-80°C, add oxalic acid or citric acid and stir for 20-30min until completely dissolved, add V 2 o 5 The active component precursor powder and WO 3 or MoO 3 The active component precursor powder is stirred at 40-80°C for 10-60min to obtain the active component impregnation solution; the V 2 o 5The molar ratio with oxalic acid or citric acid is 1: (0.8-4);

[0051] S102 adds TiO to the active component impregnation solution obtained in step S101 2 Powder, stir at 40-80°C for 10-60 minutes to obtain a viscous slurry, stir the viscous slurry, and ultrasonically disperse for 1-3 hours to obtain a catalyst slurry;

[0052] S103 drying the catalyst slurry obtained in step S102 at 200-300° C. for 2-12 hours, crushing and roasting at 300-600° C. for 2...

Embodiment 1

[0076] Embodiment 1 Catalyst powder preparation:

Embodiment 1-1

[0078] Step 1, add 310Kg of deionized water to the reactor and heat to 50-55°C, add 38Kg of oxalic acid and stir until completely dissolved, slowly add 9Kg of ammonium metavanadate (5-20min to complete), stir for 20-30min and then add 17.8 Kg ammonium molybdate, continue to stir 30min under 50 ℃ of conditions and obtain active component impregnation solution,

[0079] Step 2, 240KgTiO 2 Add the powder into the impregnation solution of the above active components, stir at 50°C for 20 minutes to obtain a viscous slurry, stir and ultrasonically disperse for 1.5 hours to obtain a catalyst slurry,

[0080] Step 3, the obtained catalyst slurry was dried at 250°C for 3.0 hours, crushed and calcined at 450°C for 3.5 hours in air flow, and crushed to 200 mesh to obtain catalyst powder 1-1, wherein, V 2 o 5 、MoO 3 The loadings were 3wt% and 6wt%.

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Abstract

The invention relates to a rare-earth modified sulfur-resisting low-temperature SCR catalyst and a preparing method thereof. The catalyst is composed of a carrier, an activity component and a performance additive component. The preparing method of the catalyst comprises the step one of catalyst powder preparation and the step two of pug treatment and formation. A certain amount of rare earth oxide is doped, acid site strength of the surface of the catalyst is improved, the number is increased, low-temperature activity of the catalyst is improved, a temperature window is broadened, the NOx removing rate of the catalyst within the range of 170-400 DEG C is kept to be 95% or above, and the application field of the denitration technology is broadened; meanwhile, production raw materials of the catalyst are easy to obtain, the preparing process is simple, and industrial production and market popularization can be achieved easily.

Description

technical field [0001] The invention relates to a rare earth-modified sulfur-resistant low-temperature SCR catalyst and a preparation method thereof, which belong to the field of air pollution control and environmental catalytic materials, and are suitable for non-electric power industry boilers, chemical industry, process, glass, cement, metallurgy, pickling and other industries Low-temperature flue gas denitrification and NOx-containing process waste gas treatment. Background technique [0002] Nitrogen oxides (NOx) have become the main air pollutants at present. The annual average emission of tens of millions of tons leads to the continuous deterioration of the atmospheric environment, seriously threatens people's life and health, and affects the sustainable development of the national economy. Coal-fired power stations, motor vehicle exhaust, and industrial boilers in non-power industries, chemical industry and other industries are the main sources of NOx emissions. Bas...

Claims

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Application Information

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IPC IPC(8): B01J23/28B01J23/30B01D53/86B01D53/56
CPCY02C20/10B01J23/002B01D53/8628B01D2255/20723B01D2255/20769B01D2255/20776B01D2258/0283B01J23/28B01J23/30B01J2523/00B01J2523/3712B01J2523/47B01J2523/55B01J2523/69B01J2523/3718B01J2523/48B01J2523/68
Inventor 展宗城李凯展宗刚杨艳林
Owner 展宗城
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