NOx removal catalyst for high-temperature flue gas, manufacturing method thereof, and NOx removal method for high-temperature flue gas

Patent metadata

Field	Value
Publication number	US-9302251-B2
Application number	US-201414333037-A
Country	US
Kind code	B2
Filing date	Jul 16, 2014
Priority date	Oct 6, 2009
Publication date	Apr 5, 2016
Grant date	Apr 5, 2016

Abstract

A NOx removal catalyst for high-temperature flue gas according to the present invention is a NOx removal catalyst for high-temperature flue gas that contains nitrogen oxide in which tungsten oxide with the number of molecular layers of tungsten oxide (WO 3 ) being five or less is supported on a complex oxide carrier containing titanium oxide. Even when high-temperature denitration is continued, a bonding force with a carrier of WO 3 can be properly maintained and volatilization can be suppressed while maintaining a high NOx removal performance. For example, the NOx removal catalyst is particularly suitable for reducing and removing nitrogen oxide contained in high-temperature gas discharged from a thermal power plant and a high-temperature boiler.

First claim

The invention claimed is:

1. A manufacturing method of a NOx removal catalyst for high-temperature flue gas, comprising:
firing a substance containing a titanium compound and either one of a zirconium compound or a silica compound at 500° C. to obtain a complex oxide carrier which is a complex oxide of the titanium compound complexed with either the zirconium compound or the silica compound;
supporting tungsten oxide (WO 3 ) on the complex oxide carrier; and
firing the complex oxide carrier at 650° C. to obtain a powdered catalyst as the NO x removal catalyst,
wherein a support quantity of the WO 3 is 16% to 24% by weight of the entire catalyst.

2. The manufacturing method of a NOx removal catalyst for high-temperature flue gas according to claim 1 , further comprising:
prior to the supporting tungsten oxide (WO 3 ), causing sulfate radicals to remain in the complex oxide carrier.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Nochi Katsumi
• Yasutake Toshinobu
• Yonemura Masanao

Classifications

• B01D2255/40

  Mixed oxides · CPC title

• B01J21/063

  Titanium; Oxides or hydroxides thereof · CPC title

• B01J21/066

  Zirconium or hafnium; Oxides or hydroxides thereof · CPC title

• B01J27/053 Primary

  Sulfates · CPC title

• B01D53/9418

  for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas · CPC title