摘要
为了研究载体对铂(Pt)基疏水催化剂活性的影响,分别选取了炭黑、SiC纳米粉、铈锆复合氧化物(Ce0.4Zr0.6O2-γ-Al2O3)等三种物质,在氯铂酸的乙二醇溶液中,用高压微波加热法制备了Pt基催化剂,然后将其与聚四氟乙烯一起负载于泡沫镍上,制成疏水催化剂.用X射线衍射、透射电子显微镜、X光电子能谱、扫描电子显微镜等方法分析了催化剂的结构与组成,并研究了疏水催化剂对氢-氧复合反应及氢-水交换反应的催化活性.结果表明:Pt在载体表面分布均匀,在Pt/C、Pt/SiC、Pt/Ce0.4Zr0.6O2-γ-Al2O3中Pt的平均粒径分别为4.46、1.67和1.77nm;Pt/C、Pt/SiC催化剂中Pt存在Pt(0)、Pt(Ⅱ)和Pt(Ⅳ)三种价态;Pt/C、Pt/SiC在泡沫镍表面的分布均匀,而Pt/Ce0.4Zr0.6O2-γ-Al2O3分布不均匀.Pt/C/FN对氢-氧复合反应和氢-水交换反应的催化活性都较高;Pt/SiC/FN和Pt/Ce0.4Zr0.6O2-γ-Al2O3/FN对氢-氧复合反应的催化活性高,但是对氢-水交换反应的催化活性很低.
In order to study the influence of carriers on platinum（Pt） based hydrophobic catalysts＇ activity,and explore the practicability of applying silicon carbide and cerium-zirconium composite oxides as carriers of hydrophobic catalysts,Pt based catalysts were prepared by microwave heating method,with carbon black,nanometer SiC and Ce0.4Zr0.6O2-γ-Al2O3 as carriers,respectively.Then Pt based catalysts were loaded on foam nickel（FN） with polytetrafluoroethylene latex,and hydrophobic catalysts were obtained.Structure of catalysts was analyzed by XRD,TEM,XPS,SEM,etc,moreover,their catalytic activity for recombination of H2-O2 and hydrogen-water liquid catalytic exchange was tested.Results show that Pt particles are evenly distributed on carriers＇ surface,and average size of Pt particles in Pt/C,Pt/SiC and Pt/Ce0.4Zr0.6O2-γ-Al2O3 are 4.46,1.67 and 1.77nm,respectively.Three valences,Pt（0）,Pt（Ⅱ） and Pt（Ⅳ） exist in Pt/C and Pt/SiC catalysts.Pt/C and Pt/SiC catalyst particles are evenly distributed on the surface of foam nickel,but it is not the case for Pt/Ce0.4Zr0.6O2-γ-Al2O3.The catalytic activity of Pt/C/FN is quite high for both recombination of H2-O2 and hydrogen-water liquid catalytic exchange.The catalytic activities of Pt/SiC/FN and Pt/Ce0.4Zr0.6O2-γ-Al2O3/FN are high for recombination of H2-O2,however,they are quite low for hydrogen-water liquid catalytic exchange.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2010年第3期279-284,共6页
Journal of Inorganic Materials
基金
中国工程物理研究院发展基金(2007B02007)
国家自然科学基金(20901071)
关键词
铂基催化剂
疏水催化剂
炭黑
纳米碳化硅
铈锆复合氧化物-γ-氧化铝
platinum based catalyst
hydrophobic catalyst
carbon black
nanometer silicon carbide
cerium-zirconium composite oxide-γ-alumina
