活化废FCC催化剂用于模拟烟气中汞的脱除  

Removal of Hg0 from simulated coal-fired flue gas by using activated spent FCC catalysts

作　　者：王华生[1,2,3] 任岩军 邓双[1,4] 黄家玉[1] 郭凤艳[1] 田刚 WANG Hua-sheng;REN Yan-jun;DENG Shuang;HUANG Jia-yu;GUO Feng-yan;TIAN Gang(Chinese Research Academy of Environmental Sciences,Beijing100012,China;Institute of Process Engineering,Chinese Academy of Sciences,Beijing100190,China;University of Chinese Academy of Sciences,Beijing100049,China;State Key Laboratory of Environmental Criteria and Risk Assessment,Beijing100012,China)

机构地区：[1]中国环境科学研究院,北京100012 [2]中国科学院过程工程研究所,北京100190 [3]中国科学院大学,北京100049 [4]中国环境科学研究院环境基准与风险评估国家重点实验室,北京100012

出　　处：《燃料化学学报》2020年第12期1466-1475,I0005,共11页Journal of Fuel Chemistry and Technology

基　　金：The project was supported by the National Key Research and Development Program of China(2018YFB0605101);the Ministry of Science and Technology of China。

摘　　要：采用有机溶剂内部瞬间沸腾法活化废流体催化裂化(SFCC)催化剂,通过固定床反应器考察了吸附温度、烟气成分及活化条件等多种变量对SFCC催化剂脱汞性能的影响。结果表明,SFCC催化剂经甲醇和乙醇活化后脱汞(Hg0)效果良好,焙烧温度也会影响催化剂活性。烟气中O2的存在有利于汞的脱除。含O2气氛下,NO在FCC-E催化剂表面形成含N活性位点,促进汞的脱除。SO2因浓度差异对Hg0的脱除表现出吸附催化和竞争吸附。在6%O2、12%CO2、0.06%NO烟气组分,120℃吸附温度,120℃活化温度,乙醇活化条件下,SFCC催化剂的脱汞效率接近100%。采用X射线荧光光谱(XRF)、扫描电镜(SEM)、X射线衍射(XRD)、热重(TG)和X射线光电子能谱(XPS)表征活化和未活化SFCC催化剂,探究与其脱汞性能关联。The spent fluid catalytic cracking(SFCC)catalysts were activated by an“internal instant vaporization(IIV)”method and used in the removal of Hg0 from a simulated flue gas in a fixed bed reactor;the effect of various operation parameters such as the SFCC activation conditions,adsorption temperature,and flue gas components on the Hg0 removal efficiency was investigated.The results indicate that the SFCC catalyst activated with methanol or ethanol performs adequately in terms of Hg0 removal,whilst the calcination temperature also has a great influence on the activation of the SFCC catalyst.O2 in the flue gas favors the Hg0 removal,whilst NO facilitates the oxidation of mercury and displays a positive effect on the mercury removal in the presence of O2,accompanying with the formation of N-containing active species on the activated SFCC catalyst surface.SO2 in the flue gas,depending on its concentration,may exert the effect of catalytic adsorption or competitive adsorption on the Hg 0 removal.Approximately 100%Hg0 can be removed in the stream of 6%O2,12%CO2 and 0.06%NO at 120℃by using the activated SFCC catalyst with ethanol as an organic solvent and calcined at 120℃,suggesting that the spent FCC catalysts after activation can be a potential adsorbent for the removal of Hg0 from the coal-fired flue gas.

关 键 词：废FCC催化剂 活化 气态单质汞 燃煤烟气 

分 类 号：X701[环境科学与工程—环境工程]