催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (6): 514-520.

• 研究论文 • 上一篇    下一篇

V2O5/AC同时脱硫脱硝催化剂在氨气氛中再生时的碳烧蚀机理

郭彦霞1,2,刘振宇1,3,刘清雅3,孙德魁1,2   

  1. 1 中国科学院山西煤炭化学研究所煤转化国家重点实验室, 山西太原 030001; 2 中国科学院研究生院, 北京 100049; 3 北京化工大学化工资源有效利用国家重点实验室, 北京 100029
  • 收稿日期:2007-06-25 出版日期:2007-06-25 发布日期:2011-05-28

Mechanism of Carbon Burn-Off on V2O5/AC for Simultaneous SO2 and NO Removal During Regeneration in NH3 Atmosphere

GUO Yanxia1,2, LIU Zhenyu1,3, LIU Qingya3, SUN Dekui1,2   

  1. 1 State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, The Chinese Academy of Sciences, Taiyuan, 030001, Shanxi, China; 2 Graduate School of Chinese Academy of Sciences, Beijing, 100049, China; 3 State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
  • Received:2007-06-25 Online:2007-06-25 Published:2011-05-28

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摘要： 采用程序升温脱附、X射线光电子能谱、元素分析和原位漫反射傅里叶变换红外光谱等方法研究了V2O5/AC同时脱硫脱硝催化-吸附剂在5%NH3-95%Ar气氛下再生时的碳烧蚀行为和机理. 结果表明, NH3与V2O5/AC表面的含氧组分(羧基、羟基、酚羟基以及V2O5等)发生了作用,优先消耗了V2O5/AC表面上的氧,生成了H2O和多种表面含氮官能团((内)酰胺类和腈类等), 从而抑制了再生时碳的烧蚀.

关键词: 氨, 五氧化二矾, 活性炭, 含氧官能团, 烧碳, 催化剂再生, 二氧化硫, 一氧化氮

Abstract: The activated carbon (AC)-supported V2O5 catalyst-sorbent, V2O5/AC, was found to be very effective for the simultaneous removal of SO2 and NO from flue gas at 200 ℃. The catalyst-sorbent, however, may suffer from high carbon loss during periodical regeneration required by the SO2 removal process. The SO2-adsorbed V2O5/AC catalyst-sorbent could be regenerated in the presence of NH3 at low temperature (300 ℃), and the carbon burn-off is much less than that in an inert atmosphere. In this study, the behaviors and mechanism of carbon burn-off during the regeneration of V2O5/AC in 5%NH3-95%Ar were studied using temperature-programmed desorption, elemental analysis,X-rayphotoelectron spectroscopy, and Fourier transform infrared spectroscopy. The carbon consumption amount for the regeneration carried out in 5%NH3-95%Ar is much lower than that in Ar atmosphere. The presence of NH3 inhibits the carbon burn-off by reacting with the surface oxygen-containing groups in V2O5/AC,-COOH,-OH,and V2O5 etc, to produce H2O and nitrogen-containing groups such as-CONH2,C-N,andC≡N.

Key words: ammonia, vanadium pentoxide, activated carbon, oxygen-containing group, carbon burn-off, catalyst regeneration, sulfur dioxide, nitric oxide