纳米Au/NaZSM-5催化剂的控制制备及催化性能  

Controlled Preparation of Nano-Au/NaZSM-5 Catalyst and Its Catalytic Performance

作　　者：毕玉水[1] 吕功煊[2] 

机构地区：[1]泰山医学院化学与化学工程学院,泰安271016 [2]中国科学院兰州化学物理研究所,羰基合成与选择氧化国家重点实验室,兰州730000

出　　处：《高等学校化学学报》2009年第1期129-134,共6页Chemical Journal of Chinese Universities

基　　金：泰山医学院博士基金(批准号:939);泰山医学院自然科学科研计划(批准号:2007zk068);泰山医学院青年科学基金(批准号:972)资助

摘　　要：采用硝基甲烷还原-胶体负载法制备了粒径可控的系列高分散纳米Au/NaZSM-5催化剂.以多相CO催化氧化为模型反应,考察了Au微粒尺寸、pH值、反应温度、反应时间、焙烧活化温度以及Au含量等条件对催化剂性能的影响,并利用透射电子显微镜(TEM)、X射线粉末衍射(XRD)、X射线光电子能谱(XPS)和氢气程序升温还原(H2-TPR)等技术对催化剂表面化学状态和体相结构进行了表征.实验结果表明,制备条件和反应条件对Au粒子尺寸及所得催化剂活性有较大影响,催化剂性能与Au微粒粒径之间存在明显的尺寸依赖关系.Series of highly dispersed size-controlled nano-Au/NaZSM-5 catalysts were prepared by nitromethane reduction-colloid gold immobilization method. Taking heterogeneous CO oxidation as a model reaction, the influences of Au particle size, pH value, reaction temperature, reaction time, activation temperature and Au loading amount on the activities of the catalysts were investigated. These catalysts were characterized by means of transmission electron microscopy （ TEM）, powder X-ray diffraction （ XRD）, X-ray photoelectron spectroscopy（XPS） and H2 temperature programmed reduction（ H2-TPR） to verify the surface chemical states and the structures of the catalysts. The results show that both the preparation procedure and the reaction conditions have great influences on the sizes of gold particles and the activities of Au/NaZSM-5 catalysts. The performances of the catalysts are obviously dependent on the sizes of gold nanoparticles.

关 键 词：纳米Au/NaZSM-5催化剂 粒径可控 CO氧化 

分 类 号：O643[理学—物理化学]