等离子体引入方式对强化制备二氧化碳重整甲烷反应的Ni/γ-Al_2O_3催化剂的影响  

Effects of Plasma Introduction Mode on Ni/γ-Al_2O_3 Catalysts for CH4 Reforming with CO2

作　　者：郭芳[1] 储伟[1] 石新雨[1] 张旭[1] 

机构地区：[1]四川大学化学工程学院,成都610065

出　　处：《高等学校化学学报》2009年第4期746-751,共6页Chemical Journal of Chinese Universities

基　　金：教育部新世纪人才计划(批准号:NCET-05-0783)资助

摘　　要：采用等离子体技术强化制备了Ni/γ-Al2O3催化剂,以CO2重整CH4为模型反应考察了等离子体引入方式对催化剂性能的影响,并采用H2-TPR,BET,CO2-TPD,XRD,CO2-TPSR,TGA及XPS技术对催化剂进行了表征.研究结果表明,与常规焙烧的催化剂相比,在氢气还原过程前引入氮气等离子体处理能有效提高催化剂的低温反应活性.N2气等离子体处理使前驱体中的硝酸盐能在温和条件下分解,并使催化剂具有较强的还原能力和较大的比表面积.先进行N2气等离子体处理再进行H2气还原的催化剂,其活性组分的分散度显著提高,对CO2的吸附量也明显增加,并且反应后催化剂上的积炭量比常规催化剂上的显著降低,形成比较单一的碳物种.For CH4 reforming with CO2 reaction, the effect of the plasma introduction mode in catalyst preparation processing on the catalytic performance of nickel-based catalysts was investigated. The catalysts were characterized by H2-TPR, BET, CO2-TPD, XRD, CO2-TPSR, TGA and XPS analyses. The catalyst treated by N2 plasma before reduction showed higher activity at low temperature than conventional calcination catalyst. The catalyst prepared by this way exhibited an improved dispersion of nickel and an increased amount of absorbed CO2. Furthermore, the formation of coke was inhibited and only one carbonaceous species presented on the used catalyst. Owing to the plasma treatment, the nitrate decomposition and catalyst reducibility were remarkably promoted, and a higher specific surface area was obtained.

关 键 词：镍基催化剂 等离子体 甲烷重整 积炭 

分 类 号：O643.3[理学—物理化学]