ZSM-5型分子筛上H_2选择还原NO  

NO Selective Reduction by H_2 over ZSM-5 Zeolites

作　　者：于青[1] 刘正先[1] 王忠卫[1] 黄小文[1] 田秀娟[1] 刘蕾[1] 

机构地区：[1]山东科技大学材料科学与工程学院,山东青岛266590

出　　处：《山东科技大学学报（自然科学版）》2014年第1期59-63,共5页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(21103099);青岛市科技计划基础研究项目(13-1-4-242-jch)

摘　　要：采用水热法合成了微米HZSM-5分子筛(HZSM-5)和纳米HZSM-5分子筛(nano-HZSM-5),通过XRD和SEM对样品进行了表征。结果表明:所得样品为纯态的HZSM-5和nano-HZSM-5分子筛。以上述样品为载体,制备了Pd基催化剂,并用于H2选择还原NO研究。在整个测试温度范围内,Pd/HZSM-5表现出良好的催化性能,优于Pd/nano-HZSM-5。当温度高于100℃时,Pd/HZSM-5上的NO可达到完全转化。此外,Pd含量仅影响低温时(<100℃)Pd/HZSM-5的催化活性。上述结果说明所制备的Pd/HZSM-5是H2选择还原NO的优良催化剂。HZSM-5 and nano-HZSM-5 zeolites were successfully synthesized by hydrothermal method. XRD and SEM were used to characterize the samples. The results indicate that these samples are pure HZSM-5 and nano-HZSM-5 zeolites. With the above result, the Pd based catalysts were made and used in selective reduction of NO by H：. In the whole temperature range,Pd/HZSM-5 exhibited perfect activity,which was better than that of Pd/nano-HZSM-5. At temperatures above 100 ℃, the NO over Pd/HZSM-5 could be fully converted. Moreover, Pd content affected the catalytic activity only at temperatures below 100 ℃. All the results prove that Pd/HZSM-5 is an excellent catalyst for selective reduction of NO by H2.

关 键 词：氢气 选择还原 一氧化氮 ZSM-5 分子筛 

分 类 号：O643[理学—物理化学]