Structural characterization of pumice-supported silver-palladium metal clusters by means of XAFS and AWAXS

被引:16
作者
Balerna, A
Liotta, L
Longo, A
Martorana, A
Meneghini, C
Mobilio, S
Pipitone, G
机构
[1] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy
[2] CNR, Ist Chim & Tecnol Prod Nat, I-90146 Palermo, Italy
[3] Univ Palermo, Dipartimento Chim Inorgan, I-90123 Palermo, Italy
[4] Univ Roma Tre, Dipartimento Fis, I-00146 Rome, Italy
关键词
D O I
10.1007/s100530050352
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Silver-palladium bimetallic clusters were synthesized on pumice by the reduction of aqueous solution of metal salts with different Pd:.Ag ratios. Used as bimetallic catalysts, in hydrogenation reactions, in situations where molecules can undergo several different reactions; they eliminate undesired reactions and maximize the desired ones. To characterize the structure of these bimetallic catalysts and control if the two metallic elements do mix or not to each other to form an alloy, the structure of the Ag-Pd bimetallic clusters was investigated by means of X-ray-absorption fine-structure spectroscopy (XAFS) and anomalous wide angle X-ray scattering (AWAXS) experiments performed at the European Synchrotron Radiation Facility (ESRF) using the GILDA and the BM16 beamlines. A correlation between Ag and Pd was found but not a clear evidence of alloying.
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页码:89 / 97
页数:9
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