Characterization of Pt/SiO2 Model Catalysts at UHV and Near Atmospheric Pressures

被引：27
作者：
McClure, Sean M. [1 ]
Lundwall, M. [1 ]
Zhou, Z. [1 ]
Yang, F. [1 ]
Goodman, D. W. [1 ]
机构：
[1] Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA
来源：
CATALYSIS LETTERS | 2009年 / 133卷 / 3-4期
关键词：
Pt/SiO2 model catalyst; Pt particles; CO oxidation; CARBON-MONOXIDE OXIDATION; PT-GROUP METALS; CO OXIDATION; ULTRAHIGH-VACUUM; SINGLE-CRYSTAL; STRUCTURE SENSITIVITY; SIZE; PARTICLES; PLATINUM; KINETICS;
D O I：
10.1007/s10562-009-0180-z
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Pt/SiO2 model catalyst samples, prepared under UHV conditions in a contiguous high pressure reactor cell surface analysis chamber, have been characterized via CO oxidation reaction kinetics under elevated pressure conditions (approaching 1 atm). Reaction kinetics are studied as a function of Pt coverage (theta (Pt) = 1-10 mL), along with measurements on a Pt(110) single crystal for direct comparison. CO desorption measurements and STM measurements on Pt/SiO2 films at T = 300 K have been obtained at various theta (Pt). Kinetic results show agreement between observations on single crystal and catalyst samples, and general agreement and correlation is obtained for site calculations across the various methods. Results demonstrate the utility of well characterized model catalyst samples in obtaining qualitative and quantitative reactivity data at elevated pressures.
引用
收藏
页码：298 / 306
页数：9
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