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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第3期    总第259期    2016年3月

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文章编号:1672-7207(2016)03-1049-09
CeO2-TiO2催化剂低温协同控制燃煤NOx与汞
李立清1,吴绍康1,李海龙1,马卫武1,杨建平2,赵永椿2,张军营2

(1. 中南大学能源科学与工程学院,湖南长沙,410083;
2. 华中科技大学煤燃烧国家重点实验室,湖北武汉,430074
)

摘 要: 采用溶胶-凝胶法合成了CeO2-TiO2(CeTi)催化剂,并采用BET,XRD和XPS等分析技术对催化剂进行表征。在固定床实验装置上研究CeTi催化剂的低温选择性催化还原(SCR)脱硝及汞氧化性能。研究结果表明:铈氧化物在催化剂表面高度分散,催化剂比表面积较大,具有丰富的表面活性氧;在250 ℃下,CeTi催化剂的汞氧化效率可达80%以上,NO还原效率可达99%;在无O2条件下,NH3显著降低催化剂的汞氧化性能,在有O2条件下,NH3微弱抑制催化剂的汞氧化活性;NO在无O2条件下会抑制汞的氧化,在有O2条件下,NO对汞的氧化起促进作用;SCR脱硝及汞氧化过程的相互影响不明显;采用CeTi催化剂可以在低温条件下实现NO与汞的协同控制。

 

关键词: 溶胶-凝胶;CeO2-TiO2;单质汞;NO;低温

Simultaneous removal of NOx and mercury over CeO2-TiO2 catalyst at low flue gas temperature
LI Liqing1, WU Shaokang1, LI Hailong1, MA Weiwu1, YANG Jianping2, ZHAO Yongchun2, ZHANG Junying2

1. School of Energy Science and Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China

Abstract:Low-temperature selective catalytic reduction (SCR) of NOx with NH3 and mercury oxidation over a highly active CeO2-TiO2 (CeTi) catalyst synthesized by sol-gel method was investigated in a fixed-bed system. The catalysts were characterized by BET surface area analysis, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). The results show that CeTi catalyst has excellent surface properties with highly dispersed ceria oxide on surface, large specific surface area and plenty of surface oxygen. At 250 ℃, the mercury oxidation efficiency can reach more than 80% and NO reduction efficiency can reach 99%. In the absence of oxygen, NH3 significantly decreases the activity of CeTi catalyst for mercury oxidation, while it has little influence with O2. NO limits mercury oxidation without oxygen, while with the participation of oxygen, NO enhances mercury oxidation. The interaction between mercury oxidation and NO reduction has little influence on cooperative control of NO and Hg0. The technology of low-temperature simultaneous removal of NO and Hg0 for coal-fired power plants might be realized with the application of CeTi catalyst.

 

Key words: sol-gel; CeO2-TiO2; mercury; NO; low temperature

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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