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Oxide catalyst for selective reduction of nitrogen oxide, preparation and uses thereof

A technology of nitrogen oxides and manufacturing methods, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc.

Inactive Publication Date: 2008-12-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these catalysts have only limited catalytic performance at low temperature

Method used

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  • Oxide catalyst for selective reduction of nitrogen oxide, preparation and uses thereof
  • Oxide catalyst for selective reduction of nitrogen oxide, preparation and uses thereof
  • Oxide catalyst for selective reduction of nitrogen oxide, preparation and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0171] Example 1 Preparation of WO by impregnation method 3 / C x Zr 1-x o 2 Particulate Catalysts and Their Characterization

[0172] The second component Ce x Zr 1-x o 2 (x=0.2; 0.66; 0.8) The composite oxide was prepared as follows.

[0173] Prepare 2 mol / L Ce(NO 3 ) 3 and Zr(NO 3 ) 4 aqueous solution. Take quantitatively the Ce(NO) prepared above 3 ) 3 solution and Zr(NO 3 ) 4 solution, urea and deionized water to make 2000 milliliters of total cation concentration is a solution of 0.1 mol / liter, and make the molar ratio Ce 3+ : Zr 4+ : urea = x: (1-x): 15 (x = 0.2; 0.66; 0.8). The solution was heated to its boiling point with stirring until a precipitate appeared. The resulting mixture was then aged at boiling point for 2 hours and then stirred at room temperature for 2 hours. The precipitate was filtered and washed with deionized water for 15 minutes with stirring. This step is repeated three times. The filter cake was then rinsed with isopropanol o...

Embodiment 2

[0178] Example 2 WO 3 / C 0.8 Zr 0.2 o 2 (1 / 10) Long-term Stability Characterization of Granular Catalysts at 300℃

[0179] WO 3 : Ce 0.8 Zr 0.2 o 2 = 1:10 (weight ratio) of WO 3 / C 0.8 Zr 0.2 o 2 Catalyst is prepared with above-mentioned embodiment 1. The stability of the catalyst was investigated by SCR reaction at 300°C for 200 hours. The test conditions are the same as those in Example 1 above. See the test results figure 2 . figure 2 Middle: Curve 2-1 is the conversion rate of NO during the 200-hour test period; Curve 2-2 is the NH conversion rate during the 200-hour test period 3 conversion rate; Curve 2-3 is the N in the reaction tail gas during the 200-hour test 2 O concentration.

[0180] figure 2 The curves clearly show that: in the 200-hour stability experiment, the activity of the tested catalyst remained stable, the NO conversion rate remained at 96%, and the NH 3 The conversion rate is constant at 100%, and only a small amount of N 2 O is ...

Embodiment 3

[0181] Example 3 Preparation of WO by impregnation method 3 / C x Zr 1-x o 2 Characterization of granular catalysts and their properties before and after aging

[0182] The second component Ce x Zr 1-x o 2 (x=0.2; 0.5; 0.8) The preparation method of the composite oxide is the same as that of the above-mentioned Example 1, but with (NH 4 ) 2 Ce(NO 3 ) 6 instead of Ce(NO 3 ) 3 as a precursor of Ce. Quantitative (NH 4 ) 2 Ce(NO 3 ) 6 , Zr(NO 3 ) 4 solution and urea in molar ratio Ce 4+ : Zr 4+ : urea = (1-x): x: 15 (x = 0.2; 0.5; 0.8) Prepare 2000 ml of a solution with a cation concentration of 0.2 mol / l. The solution was heated to its boiling point with stirring until co-precipitation was observed. The resulting mixture was then aged at the boiling point for 2 hours and stirred at room temperature for an additional 2 hours. The precipitate was filtered and washed with 1500 ml of deionized water for 15 minutes with stirring. This step is repeated three tim...

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Abstract

The invention provides a catalyst for selective catalytic reduction of nitrogen oxide, which comprises: a first composition selected from one or a combination of transition metal oxides excluding a second composition, and the second composition selected from one or a combination of cerium oxide, cerium-zirconium compound oxide and cerium-titanium compound oxide. The catalyst can be applied in the form of a granular catalyst, and can also be coated on multiporous integral ceramic to be applied in the form of a honeycomb catalyst. The invention also provides a manufacturing method for the catalyst, which comprises the following steps that: a precursor of the first composition is used to prepare the first composition; the second composition is prepared; and the first composition is loaded onto the second composition. Certain preferable embodiments for the catalyst can ensure that the health of human beings and animals can not be affected when the selective catalytic reduction of nitrogenoxide (NOx) emission is performed.

Description

technical field [0001] The invention relates to a catalyst for catalytic reduction of nitrogen oxides and a preparation method thereof, and in particular to an oxide catalyst for selective catalytic reduction of nitrogen oxides and a preparation method thereof. Background technique [0002] As we all know, nitrogen oxides (Nitrogen Oxides, including NO 2 , N 2 O and NO, hereinafter collectively referred to as "NO x ") is the combustion product produced by the combustion of fuel in air. At high temperature, NO x The thermodynamic stability of N 2 and O 2 powerful. So, NO x Inevitably become a pollutant from many high temperature processes such as engine combustion or various industrial processes. [0003] There are two main methods to reduce nitrogen oxide pollution in the air: reducing source emission and exhaust gas terminal treatment. The first approach uses various techniques to improve combustion. The second method uses various physical or chemical methods to re...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J23/10B01D53/56B01D53/94
CPCB01D2255/20715B01J37/03B01J23/002B01J37/024B01J23/30B01J23/83B01D53/9418B01J37/086B01D2255/2073B01J37/0211Y02C20/10B01J23/26B01D53/8628B01J23/10B01D2255/20723B01J35/023B01J23/28B01J37/0201B01J23/22B01D2255/20707B01D2255/2065B01D2251/206B01D2255/20776B01D2255/20769B01J37/009B01J37/0236B01J23/34B01J2523/00B01J35/40B01J2523/3712B01J2523/48B01J2523/69B01J2523/47
Inventor 王树东程昊李烨冈田明谢玉明
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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