Acid-modified CeO2-based SCR (Selective Catalytic Reduction) catalyst for denitration and preparation method of acid-modified CeO2-based SCR catalyst

An SCR catalyst, acid modification technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of large biological toxicity, narrow operating temperature window, etc., and achieve excellent low temperature activity and excellent selectivity. , the effect of easy industrial production

Active Publication Date: 2013-07-17
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in this catalyst system, such as: it contains toxic substance V, if it falls off during use, it has great biological toxicity when it enters the environment; the operating temperature window is narrow, and a large amount of greenhouse gas N is generated at high temperature. 2 O; easy to remove SO in the flue gas 2 Catalytic conversion to SO 3

Method used

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  • Acid-modified CeO2-based SCR (Selective Catalytic Reduction) catalyst for denitration and preparation method of acid-modified CeO2-based SCR catalyst
  • Acid-modified CeO2-based SCR (Selective Catalytic Reduction) catalyst for denitration and preparation method of acid-modified CeO2-based SCR catalyst
  • Acid-modified CeO2-based SCR (Selective Catalytic Reduction) catalyst for denitration and preparation method of acid-modified CeO2-based SCR catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0040] Take a certain amount of Ce(NO 3 ) 3 ·6H 2 O, zirconium acetate and water were mixed at a mass ratio of 40:10:50 at a stirring speed of 500 r / min to prepare slurry A. The 200-mesh cordierite honeycomb ceramic carrier was soaked in the slurry for 30 min, and the excess solution in the channels was blown out with high-pressure gas to ensure that the cells of the honeycomb were connected, and then the carrier was dried at 110 °C for 2 h; after repeating the above steps 3 times, The carrier was calcined at 550 °C for 3 h, and the active component was CeO 2 Active coating carrier B, CeO 2 The load is 100 g / L, accounting for CeO 2 The total mass of the cordierite carrier and the carrier is 10%, and the water absorption rate of the carrier at this time is measured to be 25 wt%. Configure the required niobium oxalate (C 12 h 7 NbO 24 ) Salt solution C, and use this solution to load Nb on the surface of carrier B by excessive impregnation method 2 o 5 The carrier of th...

Embodiment 5

[0042] Take a certain amount of Ce(NO 3 ) 3 ·6H 2 O, zirconium acetate and water were mixed at a mass ratio of 40:10:50 at a stirring speed of 500 r / min to prepare slurry A. The 200-mesh cordierite honeycomb ceramic carrier was soaked in the slurry for 30 min, and the excess solution in the channels was blown out with high-pressure gas to ensure that the cells of the honeycomb were connected, and then the carrier was dried at 110 °C for 2 h; after repeating the above steps 3 times, The carrier was calcined at 550 °C for 3 h, and the active component was CeO 2 Active coating carrier B, CeO 2 The load is 100 g / L, accounting for CeO 2 The total mass of the cordierite carrier and the carrier is 10%, and the water absorption rate of the carrier at this time is measured to be 25 wt%. Configure the required niobium oxalate (C 12 h 7 NbO 24 ) Salt solution C, and use this solution to load Nb on the surface of carrier B by excessive impregnation method 2 o 5 The modified coat...

Embodiment 6

[0044] Take a certain amount of Ce(NO 3 ) 3 ·6H 2 O, zirconium acetate and water were mixed at a mass ratio of 40:10:50 at a stirring speed of 500 r / min to prepare slurry A. The 200-mesh cordierite honeycomb ceramic carrier was soaked in the slurry for 30 min, and the excess solution in the channels was blown out with high-pressure gas to ensure that the cells of the honeycomb were connected, and then the carrier was dried at 110 °C for 2 h; after repeating the above steps 3 times, The carrier was calcined at 550 °C for 3 h, and the active component was CeO 2 Active coating carrier B, CeO 2 The load is 100 g / L, accounting for CeO 2 The total mass of the cordierite carrier and the carrier is 10%, and the water absorption rate of the carrier at this time is measured to be 25 wt%. According to the calculated water absorption configuration required (H 3 PO 4 ) solution D, and use this solution to support P on the cooled catalyst by the equal volume impregnation method 2 o ...

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Abstract

The invention belongs to the field of posttreatment and purification of NOx and in particular relates to an acid-modified CeO2-based SCR (Selective Catalytic Reduction) catalyst for denitration and a preparation method of the acid-modified CeO2-based SCR catalyst. The catalyst has a three-layer structure, wherein cordierite honeycomb ceramic is used as a carrier, an active coating is loaded on the carrier, and a modified coating is loaded on the active coating. The cordierite carrier plays a framework loading role; the active coating of the catalyst mainly plays a role of activating NOx and NH3; and the modified coating mainly plays a role of cooperating with active components and can be used for promoting the catalytic activity of the catalyst, avoiding advanced oxidation on the surface of the catalyst which is applied at high temperature and improving the anti-hydrothermal and anti-aging performances of the catalyst. The catalyst is prepared with a simple process and is easy for industrial production. The working temperature window (the denitration efficiency is more than 80 percent) of the optimized catalyst can reach 200-500 DEG C. The catalyst does not contain V2O5, is free of toxicity and excellent in N2 generation selectivity, can be suitable for high-airspeed reaction conditions and has favorable thermal stability.

Description

technical field [0001] The present invention belongs to nitrogen oxides (NO x ) post-treatment purification field, especially related to an acid-modified CeO for denitrification 2 Based SCR catalyst and preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) usually includes NO, NO 2 etc., mainly from the high-temperature combustion of motor vehicle exhaust gas, flue gas from thermal power stations, ship exhaust gas, and other industrial fossil fuels, as well as the industrial production process of nitric acid, nitrogen fertilizer, and explosives. At present, post-treatment and denitrification methods are mainly used at home and abroad to reduce the NOx in diesel vehicle exhaust and thermal power plant boilers, steel plants, and cement plant kiln flues. x NH 3 selective catalytic reduction. The performance requirements of SCR catalysts are high denitrification efficiency, high selectivity, resistance to hydrothermal, alkali and SO 2 Poisoning...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/195B01D53/85B01D53/56
CPCY02A50/20
Inventor 翁端马子然吴晓东司知蠢
Owner TSINGHUA UNIV
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