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作者:

Gan, Yanling (Gan, Yanling.) | Dai, Wenjing (Dai, Wenjing.) | Huang, Pingli (Huang, Pingli.) | Zhang, Boge (Zhang, Boge.) | Cui, Suping (Cui, Suping.) (学者:崔素萍)

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摘要:

NOx emission from the cement industry have received much attention. In order to reduce the NOx emission in cement kilns, nickel slag was used to prepare the non-ammonia denitrification material, and a denitrification mechanism was proposed in this study. The results showed that the denitrification material prepared at pH 7 exhibited the best denitrification performance. At low temperature, the highest denitrification performance was achieved between 200 and 300 & DEG;C with a NO decomposition rate of approximately 40%. Then, the NO decomposition rate increased as the temperature increased, reaching over 95% above 700 & DEG;C. The physicochemical characteristics showed that the material had the highest specific surface area and the highest relative Fe content, which benefited the denitrification performance. The divalent iron of the denitrification material was considered the active site for the reaction, and trivalent iron was not conducive to denitrification performance at a low temperature range. After the denitrification reaction, the Fe3+/Fe2+ increased from 0.89 to 1.31. The proposed denitrification mechanism was the redox process between divalent iron and trivalent iron. This study not only recycles industrial waste to reduce solid waste pollution but also efficiently removes nitrogen oxides from cement kilns without ammonia.

关键词:

nickel slag trivalent iron NO decomposition cement kilns divalent iron

作者机构:

  • [ 1 ] [Gan, Yanling]Sun Yat Sen Univ, Sch Environm Sci & Engn, 135 Xingang Xi Rd, Guangzhou 510275, Peoples R China
  • [ 2 ] [Dai, Wenjing]Sun Yat Sen Univ, Sch Environm Sci & Engn, 135 Xingang Xi Rd, Guangzhou 510275, Peoples R China
  • [ 3 ] [Huang, Pingli]Sun Yat Sen Univ, Sch Environm Sci & Engn, 135 Xingang Xi Rd, Guangzhou 510275, Peoples R China
  • [ 4 ] [Zhang, Boge]Sun Yat Sen Univ, Sch Environm Sci & Engn, 135 Xingang Xi Rd, Guangzhou 510275, Peoples R China
  • [ 5 ] [Gan, Yanling]Guangdong Hongkong Macau Joint Lab Collaborat Inno, 855 Xingye Ave East, Guangzhou 511443, Peoples R China
  • [ 6 ] [Gan, Yanling]Beijing Univ Technol, Coll Mat Sci & Engn, 100 Pingleyuan,Chaoyang Dist, Beijing 100124, Peoples R China
  • [ 7 ] [Cui, Suping]Beijing Univ Technol, Coll Mat Sci & Engn, 100 Pingleyuan,Chaoyang Dist, Beijing 100124, Peoples R China

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来源 :

MATERIALS

年份: 2023

期: 17

卷: 16

3 . 4 0 0

JCR@2022

ESI学科: MATERIALS SCIENCE;

ESI高被引阀值:26

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SCOPUS被引频次: 1

ESI高被引论文在榜: 0 展开所有

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