Tuning Pt dispersion and oxygen mobility of Pt/γ-Al2O3 by Si addition for CO oxidation

被引：8
作者：
Chotigkrai, Nutchapon [1 ]
Hochin, Yuthana [1 ]
Panpranot, Joongjai [1 ]
Praserthdam, Piyasan [1 ]
机构：
[1] Chulalongkorn Univ, Dept Chem Engn, Ctr Excellence Catalysis & Catalyt React Engn, Fac Engn, Bangkok 10330, Thailand
来源：
REACTION KINETICS MECHANISMS AND CATALYSIS | 2016年 / 117卷 / 02期
关键词：
Pt/Al2O3; nanocatalyst; SiO2; addition; Pt dispersion; Oxygen mobility; CO oxidation; CARBON-MONOXIDE; REDUCTION TREATMENTS; CATALYTIC-OXIDATION; SUPPORTED CATALYSTS; PLATINUM; PT/AL2O3; ALUMINA; HYDROGEN; GAMMA-AL2O3; DESORPTION;
D O I：
10.1007/s11144-015-0969-2
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：
gamma-Al2O3 was doped with TEOS solution to obtain SiO2 content in the range of 0.6-12.4 wt%. Pt dispersion was effectively enhanced by 82 and 45 % by doping 0.6 and 1.2 wt% SiO2, and was slightly declined afterward. However, oxygen mobility as described by the reduction of basicity was monotonically decreased with increasing SiO2 content. The results from CO oxidation tests reveal a linear relationship between TOFs and desorbed-CO2. It is suggested that oxygen mobility plays a distinct role in controlling the surface reaction between CO and O surface species, which were activated by different adjacent Pt clusters. The highly dispersed Pt catalysts obtained by this technique can also be applied to other structure-insensitive reactions such as propane dehydrogenation.
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收藏
页码：565 / 581
页数：17
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