193Ir Mössbauer study of bimetallic platinum-iridium catalysts |
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| Authors: | F E Wagner J A Sawicki J H Rolston |
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| Institution: | (1) Physics Department, Technical University of Munich, D-8046 Garching, Germany;(2) Chalk River Nuclear Laboratories, K0J1J0 Chalk River, Ontario, Canada |
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| Abstract: | Using the 73.0 keV Mössbauer resonance in193Ir, the chemical form of iridium in bimetallic Pt?Ir catalysts supported on amorphous silica has been determined after ionic co-exchange, calcination and reduction in hydrogen. The compositions of the highly dispersed bimetallic Pt1?xIrx clusters as determined from the measured isomer shifts reveal a strong tendency for segregation of iridium and platinum. |
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