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

Huang, Wenyu and Kuhn, John N. and Tsung, Chia-Kuang and Zhang, Yawen and Habas, Susan E. and Yang, Peidong and Somorjai, Gabor A. (2008) Dendrimer templated synthesis of one nanometer Rh and Pt particles supported on mesoporous silica: Catalytic activity for ethylene and pyrrole hydrogenation. NANO LETTERS, 8 (7). pp. 2027-2034.

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Official URL: http://dx.doi.org/10.1021/nl801325m

Abstract

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.

Item Type:Article
Subjects:Material Science > Nanofabrication processes and tools
Material Science > Nanochemistry
ID Code:1325
Deposited By:Anuj Seth
Deposited On:09 Dec 2008 17:05
Last Modified:09 Dec 2008 17:05

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