Pd/γ-Al_2O_3催化剂对烟气中多环芳烃的氧化性能研究  

Oxidation characteristics of polycyclic aromatic hydrocarbons in flue gas over Pd/γ-Al_2O_3 catalyst

作　　者：张云峰[1,2] 何炽[1] 徐琪[1] 崔星[1] 陈进生[1] 

机构地区：[1]中国科学院城市环境研究所,福建厦门361021 [2]泉州师范学院,福建泉州362000

出　　处：《燃料化学学报》2011年第7期543-549,共7页Journal of Fuel Chemistry and Technology

基　　金：国家科技支撑计划项目(2008BAC32B03);厦门市科技计划项目(3502Z20102015)

摘　　要：实验采用等体积浸渍法制备了系列Pd/γ-Al2O3催化剂。采用模拟实验装置并结合XRD、N2吸/脱附、TEM、H2-TPR和SEM-MAPS等手段对催化剂的组成及结构进行了表征,系统地考察了各催化剂对燃煤烟气中PAHs的催化氧化性能。结果表明,催化剂对烟气中PAHs排放总量的氧化效率为67.3%-93.5%,且烟气中PAHs的转化率随着Pd负载量的增加而提高;而催化剂的氧化性能随着PAHs环数（3-6）的增加而提高,对烟气中各PAHs排放毒性当量去除率超过90%。其中,Pd负载量为0.2%、催化剂焙烧温度为600℃条件下制备的催化剂具有最佳的PAHs消除性能,PAHs的氧化效率可达93.5%。A series of Pd/γ-Al2O3 catalysts with various Pd loadings was prepared via incipient-wetness impregnation method under different synthesis conditions.The structural and textural properties of the synthesized catalysts were characterized by XRD,N2 adsorption/desorption,TEM,H2-TPR,and SEM-MAPS;their catalytic performance in the elimination of polycyclic aromatic hydrocarbons（PAHs） in coal-fired flue gas by oxidation was investigated.The results revealed that the PAHs removal efficiency over various Pd-loaded catalysts fluctuates between 67.3% and 93.5%;the conversion of PAHs increases with the Pd loading in the catalyst.Moreover,a better oxidation activity of these catalysts is observed for the PAHs with higher ring-cycles;nevertheless,the removal rates based on the toxicity equivalence quantity（TEQ） for all PAHs are higher than 90%.The Pd/γ-Al2O3 with a Pd loading of 0.2% and calcined at 600℃ exhibits the best catalytic performance for PAHs oxidation,with a removal rate of 93.5% at 300℃.

关 键 词：钯 氧化铝 烟气 PAHS 催化氧化 

分 类 号：X511[环境科学与工程—环境工程]