Actions for Dendrimer Templated Synthesis of One Nanometer Rh and Pt Particles Supported on Mesoporous Silica [electronic resource] : Catalytic Activity for Ethylene and Pyrrole Hydrogenation

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Dendrimer Templated Synthesis of One Nanometer Rh and Pt Particles Supported on Mesoporous Silica [electronic resource] : Catalytic Activity for Ethylene and Pyrrole Hydrogenation

Published
Berkeley, Calif. : Lawrence Berkeley National Laboratory, 2008.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators
Lawrence Berkeley National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Monodisperse rhodium (Rh) and platinum (Pt) nanoparticles as small as ≈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 H₂ after reduction (76 torr of H₂ 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.
Report Numbers
E 1.99:lbnl-1802e
lbnl-1802e
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Note
Published through SciTech Connect.
05/09/2008.
"lbnl-1802e"
Nano Letters 8 7 ISSN 1530-6984 FT
Somorjai, Gabor A.; Yang, Peidong; Habas, Susan E.; Kuhn, John N.; Zhang, Yawen; Huang, Wenyu; Tsung, Chia-Kuang.
Chemical Sciences Division
Materials Sciences Division
Funding Information
DE-AC02-05CH11231
View MARC record | catkey: 14392906