Size-Dependent Sulfur Poisoning of Silica-Supported Monodisperse Pt Nanoparticle Hydrogenation Catalysts

被引：32

作者：

Baldyga, Lyndsey M. ^{[1
]}

Blavo, Selasi O. ^{[1
]}

Kuo, Chun-Hong ^{[2
]}

Tsung, Chia-Kuang ^{[2
]}

Kuhn, John N. ^{[1
]}

机构：

[1] Univ S Florida, Dept Chem & Biomed Engn, Tampa, FL 33620 USA

[2] Boston Coll, Dept Chem, Chestnut Hill, MA 02467 USA

来源：

ACS CATALYSIS | 2012年 / 2卷 / 12期

关键词：

platinum; sulfur poisoning; colloidal synthesis with size control; structure sensitivity; ELECTRON-BEAM LITHOGRAPHY; ETHYLENE HYDROGENATION; PARTICLE-SIZE; PLATINUM NANOPARTICLES; BENZENE HYDROGENATION; STRUCTURE SENSITIVITY; HYDRODESULFURIZATION; 4,6-DIMETHYLDIBENZOTHIOPHENE; SBA-15; PD;

D O I：

10.1021/cs300625m

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：

Colloidal techniques were used to synthesize monodisperse Pt nanoparticles of four distinct sizes between 2 and 7 nm before immobilization onto silica. Ethylene hydrogenation demonstrated structure-insensitive behavior with TOFs of similar to 12 s(-1) before poisoning. With thiophene being a strong binding adsorbate, TOFs decreased by orders of magnitude, and the poisoning-induced antipathetic structure sensitivity because thiophene adsorbed more strongly to the coordinatively unsaturated, as compared with coordinatively saturated, surfaces, and the degree of saturation increased with decreasing Pt size. This effort is part of a broader study in which structure sensitivity is analyzed for adsorbates in complex reaction networks.

引用

页码：2626 / 2629

页数：4

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