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NOx reduction catalyst, NOx reduction catalyst system, and method for reducing NOx

A catalyst and catalyst carrier technology, applied in the direction of catalyst activation/preparation, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problem of insufficient reduction of NOx in low-temperature treatment gas, and achieve high NOx purification performance

Inactive Publication Date: 2009-06-10
CATALER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that conventional SCR catalysts cannot sufficiently reduce NOx in low-temperature process gases such as diesel engine exhaust

Method used

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  • NOx reduction catalyst, NOx reduction catalyst system, and method for reducing NOx
  • NOx reduction catalyst, NOx reduction catalyst system, and method for reducing NOx
  • NOx reduction catalyst, NOx reduction catalyst system, and method for reducing NOx

Examples

Experimental program
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Effect test

Embodiment 1

[0081] The following components were mixed, stirred for 1 hour, and then wet pulverized using a ball mill for 1 hour.

[0082] Zeolite β (silica / alumina ratio: 35), manufactured by Tosoh Corporation: 100 parts by weight

[0083] Ferric nitrate: 25 parts by weight

[0084] γ alumina: 20 parts by weight

[0085] Barium acetate: 25 parts by weight

[0086] Ion-exchanged water: 200 parts by weight

[0087] After that, further add 10 parts by weight (converted to Al 2 o 3 ) alumina sol (AS200, manufactured by Nissan Chemical Industries, Ltd.) as a binder to prepare a slurry.

[0088] The above slurry was applied to ceramic honeycomb 1 manufactured by NGK Insulators, Ltd. (density 300 cells / square inch, wall thickness 8 mils, size Φ190.5×L76 mm, volume 2.2 L). After blowing off excess slurry, the ceramic honeycomb 1 was dried at 200° C. for 1 hour and calcined at 500° C. for 1 hour to manufacture a NOx reduction catalyst 5 with a catalyst layer 3 as shown in FIG. 1 . The resp...

Embodiment 2

[0095] NOx reduction catalyst 5 was manufactured in the same manner as in Example 1 except that the same amount of ZSM5 (silica / alumina ratio: 30) manufactured by Tosoh Corporation was used instead of zeolite β.

Embodiment 3

[0097] NOx reduction catalyst 5 was produced in the same manner as in Example 1 except that an aqueous oxalic acid solution containing vanadium oxide was used instead of iron nitrate. The amount of the oxalic acid aqueous solution of vanadium oxide is the amount that contains 0.2 mol / L vanadium in the catalyst layer 3 .

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Abstract

Disclosed is a NOx reduction catalyst for reducing NOx in a process gas, which is characterized by comprising a catalyst carrier containing an oxide, a NOx adsorbing component and a NOx purifying component.

Description

technical field [0001] The present invention relates to a NOx reduction catalyst, a NOx reduction catalyst system, and a NOx reduction method for reducing nitrogen oxides contained in automobile exhaust gas and flue gas of a power plant. Background technique [0002] Vehicle exhaust and flue gas from power plants contain harmful oxides of nitrogen (NOx). Catalysts for selectively reducing these NOx (hereinafter referred to as SCR catalysts) have been developed. For example, the use of SCR catalysts to reduce NOx contained in diesel engine exhaust to N 2 technology, the SCR catalyst includes beta-type zeolite ion-exchanged with iron and lanthanum (see Patent Document 1). [0003] Patent Document 1: JP-A-2005-177570 Contents of the invention [0004] The technical problem to be solved by the invention [0005] However, the NOx reduction performance of conventional SCR catalysts is significantly reduced at low temperatures of 200° C. or less. Therefore, there is a proble...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01D53/94B01J29/46B01J29/70B01J29/78B01J35/04F01N3/04F01N3/08F01N3/28F01N3/36
CPCB01J29/46F01N3/0814B01D2255/2022B01J29/7057B01D2255/1025F01N3/0842B01D2255/91B01D2255/2063B01J37/0246B01D2255/9022B01J37/0234F01N3/2066B01D53/9413F01N2610/02B01D2255/2042F01N2610/03B01J29/7615B01D2255/2025B01D2255/20723B01D2255/1021B01J37/0036B01J29/7815B01D2255/20707B01D2255/2065F01N3/0871Y02T10/24B01J37/0244B01D2251/206B01D2255/20776B01D2255/20738B01D2255/2068Y02T10/12Y02A50/20B01D53/94B01J29/76F01N3/04F01N3/08
Inventor 山下嘉典青野纪彦村井俊水
Owner CATALER CORP