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oa The State of the Metal Phase in Supported Platinum-Containing Bimetallic Catalysts
Evidence Provided by Hydrogen-Oxygen Titration
- Source: Platinum Metals Review, Volume 23, Issue 1, Jan 1979, p. 18 - 21
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- 01 Jan 1979
Abstract
The catalytic reforming of crude oils has been considerably improved during the last ten years by the addition of a second metal, generally rhenium or iridium, to the small amounts of platinum present in alumina supported catalysts. A most important question, from a scientific point of view, is to differentiate between the various possible states of the metal phase, which may range from a mixture of platinum and the second metal particles to homogeneous bimetallic aggregates. This differentiation is extremely difficult because of the very small size of the metallic particles. It is reported that hydrogen-oxygen titration provides evidence of the presence of small particles of pure rhenium, iridium or ruthenium in platinum bimetallic alumina supported catalysts.