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Catalyst system for removing nitrogen oxide and method for removing nitrogen oxide

一种催化剂、氧化氮的技术,应用在化学仪器和方法、催化剂活化/制备、非均相催化剂化学元素等方向,能够解决氨漏出、环境污染等问题

Inactive Publication Date: 2007-04-11
TOKYO ROKI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when ammonia is used in a large amount, or when the reaction conditions (such as space velocity, temperature, etc.)

Method used

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  • Catalyst system for removing nitrogen oxide and method for removing nitrogen oxide
  • Catalyst system for removing nitrogen oxide and method for removing nitrogen oxide
  • Catalyst system for removing nitrogen oxide and method for removing nitrogen oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] 4 Preparation of -Zr-based catalyst>

[0087] An aqueous solution of a mixture of 100 g of Zr salt (zirconium sulfate), 50 g of Ti salt (titanium chloride) and 50 g of Ce salt (cerium nitrate) dissolved in 1 L of water was prepared, followed by addition of alkali solution (ammonia) for neutralization and filtration. The solution is burned at 400° C. or higher, and pulverized to obtain a powder. Thereafter, the powder was determined to be Ce-Ti-SO by X-ray diffraction 4 - Zr-based catalysts (see Figure 2).

Embodiment 2

[0089]

[0090] While stirring, an aqueous solution of ferric nitrate (prepared by dissolving 1,000 g of ferric nitrate in 500 L of water) was gradually dropped onto 1,000 g of porous oxide composed of silica-alumina (molar composition ratio = 40 / 1) superior. The obtained powdery substance was dried at 120° C. and fired at 450° C. for 2 hours to obtain a powder. Thereafter, it was confirmed that the powder was an Fe-Si-Al oxide-based catalyst (see FIG. 3 ).

Embodiment 3

[0092]

[0093] An aqueous solution of a mixture of 100 g of Zr salt (zirconium sulfate) and 50 g of Ce salt (cerium nitrate) dissolved in 1 L of water was prepared, then neutralized by adding an alkali solution (ammonia water), and filtered. 15 g of ammonium tungstate was immersed in the solution, then burned at 400° C. or higher, and pulverized to obtain a powder. Thereafter, it was confirmed that the powder was a Ce-W-Zr oxide-based catalyst (see FIG. 4 ).

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Abstract

Provided in a catalyst system are: a first reaction part fitted with a first catalyst containing, as active constituents, at least, a complex oxide consisting of two or more oxides selected from among silica, alumina, titania, zirconia, and tungsten oxide, and a rare earth metal or transition metal (except Cu, Co, Ni, Mn, Cr, and V); and a second reaction part fitted with a second catalyst containing, as active constituents, at least, a noble metal and a silica-alumina type complex oxide.

Description

[0001] Cross References to Related Applications [0002] This application claims priority based on Japanese Patent Application No. 2004-55351 filed on February 27, 2004, which is incorporated herein by reference. technical field [0003] The present application relates to a nitrogen oxide removal catalyst system and a nitrogen oxide removal method. Background technique [0004] In order to remove (eliminate) nitrogen oxides, a technique of reducing and denitrating nitrogen oxides by bringing them into contact with a catalyst in the presence of ammonia (see the following formulas (1) and (2)) is generally used, the main component of which is titanium dioxide and vanadium oxide (see, for example, Japanese Patent Application No. H7-275656). However, when ammonia is used in a large amount, or when the reaction conditions (such as space velocity, temperature, etc.) . Thus, there is known a method of contacting a platinum-supported alumina catalyst and oxidatively decomposing a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01D53/86B01J23/30B01J23/42B01J23/745B01J23/89B01J27/053F01N3/10F01N3/08B01J21/12B01J23/00B01J23/40B01J35/00B01J37/03F01N3/20F01N3/28F01N13/02
CPCB01J27/053B01J37/03B01D2255/1021B01J23/002F01N13/02B01J35/0006F01N2013/026B01J23/30B01J23/42B01D2255/20707B01J23/745F01N3/2066B01J21/12Y02T10/24B01D2255/102B01J23/40B01D2255/407B01D2255/20738B01D53/9413B01D2255/40B01J2523/00F01N2610/02F01N13/0097F01N13/009Y02T10/12B01J35/19B01J2523/31B01J2523/41B01J2523/842B01J2523/3712B01J2523/48B01J2523/69B01J2523/828B01J2523/47B01J2523/62
Inventor 森高行岩见畅也熊谷隆幸金谷勇上野弘树平田公信
Owner TOKYO ROKI
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