Catalyst for synergistic control of oxynitride and mercury and method for preparing the same

Patent metadata

Field	Value
Publication number	US-9802180-B2
Application number	US-201315104045-A
Country	US
Kind code	B2
Filing date	Dec 11, 2013
Priority date	Dec 11, 2013
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

Disclosed are a catalyst for synergistic control of oxynitride and mercury and a method for preparing the same. The catalyst includes the following components by mass percentage: a carrier: TiO2 72%-98.6%, active components: V2O5 0.1%-5%, WO3 1%-10%, Cr2O3 0.1%-5% and Nb2O5 0.1%-5%, and a co-catalyst of 0.1%-3%. The present invention can be used for reducing the oxynitrides in a flue gas, meanwhile oxidizing zero-valent mercury into bivalent mercury and then controlling the reactions, has relatively high denitration performance and also has high mercury oxidation performance; compared with current commercial SCR catalysts, the mercury oxidation rate of the catalyst is improved to a great extent, which can adapt to the requirements for mercury removal in China's coal-fired power plants, the conversion rate of SO2/SO3 is relatively low, and the catalyst has a better anti-poisoning ability, and is a new catalyst with a low cost and high performance.

First claim

The invention claimed is:

1. A method for preparing a catalyst for synergistic control of oxynitride and mercury, wherein the method comprises the following steps:
1) drying TiO 2 and use TiO 2 as a carrier;
2) stirring ammonium metavanadate and ammonium metatungstate under 50° C.-70° C. to dissolve in an oxalic acid or tartaric acid solution to obtain a solution A with pH value less than 2;
stirring chromic nitrate under 10-50° C. to dissolve in deionized water or tartaric acid to obtain a solution B;
stirring niobium oxalate under 50-70° C. to dissolve in deionized water or tartaric acid to obtain a solution C;
3) stirring cupric nitrate under 10-50° C. to dissolve in deionized water or tartaric acid to obtain a solution D;
or stirring ferric nitrate under 10-50° C. to dissolve in deionized water or tartaric acid to obtain a solution E;
or stirring ammonium molybdate under 10-50° C. to dissolve in deionized water or tartaric acid to obtain a solution F;
4) mixing the solution A, solution B and solution C with one of the solution D, solution E and solution F to obtain an impregnating solution, immersing the carrier from step 1) into the impregnating solution, stirring evenly for ultrasound concussion, evaporating and stirring with water bath for 10-60 minutes, drying in the oven and then calcine under 400° C.-550° C. for 3-5 hours to obtain the catalyst for synergistic control of oxynitride and mercury.

2. The preparation method according to claim 1 , wherein the drying in step 1) is drying under 105° C.-120° C. for 12 hours-24 hours.

3. The preparation method according to claim 1 , wherein the ultrasound concussion time in step 4) is 10-60 minutes.

4. The preparation method according to claim 1 , wherein the water bath temperature in step 4) is 70-90° C.

5. The preparation method according to claim 4 , wherein the drying condition in oven in step 4) is drying under 105-120° C. for 12-24 hours.

Assignees

• Univ Zhejiang

Inventors

• Gao Xiang
• Qiu Kunzan
• Zheng Chenghang
• Song Hao
• Wu Weihong
• Zhu Xinbo
• Yu Hongmin
• Xu Dian
• Luo Zhongyang
• Cen Kefa
• Ni Mingjiang

Classifications

• B01J35/45

  Nanoparticles · CPC title

• B01J2523/47

  Titanium · CPC title

• B01D2255/20761

  Copper · CPC title

• B01D2255/207

  Transition metals · CPC title

• B01D2255/20776

  Tungsten · CPC title