Dendrimer templated synthesis of one nanometer Rh and Pt particles supported on mesoporous silica: Catalytic activity for ethylene and pyrrole hydrogenation

被引：243

作者：

Huang, Wenyu ^{[1
,2
]}

Kuhn, John N. ^{[1
,2
]}

Tsung, Chia-Kuang ^{[1
,2
]}

Zhang, Yawen ^{[1
,2
,3
,4
]}

Habas, Susan E. ^{[1
,2
]}

Yang, Peidong ^{[1
,2
]}

Somorjai, Gabor A. ^{[1
,2
]}

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Div Chem & Mat Sci, Berkeley, CA 94720 USA

[3] Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, Beijing 100871, Peoples R China

[4] Peking Univ, PKU HKU Joint Lab Rare Earth Mat & Bioinorgan Che, Beijing 100871, Peoples R China

来源：

NANO LETTERS | 2008年 / 8卷 / 07期

关键词：

D O I：

10.1021/nl801325m

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Monodisperse rhodium (Rh) and platinum (Pt) nanoparticles as small as similar to 1 nm were synthesized within a fourth generation polyaminoamide (PAMAM) dendrimer, a hyperbranched polymer, in aqueous solution and immobilized by depositing onto a high-surface-area SBA-15 mesoporous support. X-ray photoelectron spectroscopy indicated that the as-synthesized Rh and Pt nanoparticles were mostly oxidized. Catalytic activity of the SBA-15 supported Rh and Pt nanoparticles was studied with ethylene hydrogenation at 273 and 293 K in 10 torr of ethylene and 100 torr of H-2 after reduction (76 torr of H-2 mixed with 690 torr of He) at different temperatures. Catalysts were active without removing the dendrimer capping but reached their highest activity after hydrogen reduction at a moderate temperature (423 K). When treated at a higher temperature (473, 573, and 673 K) in hydrogen, catalytic activity decreased. By using the same treatment that led to maximum ethylene hydrogenation activity, catalytic activity was also evaluated for pyrrole hydrogenation.

引用

页码：2027 / 2034

页数：8

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