Title of article :
In situ surface characterization of the intermetallic compound PdGa – A highly selective hydrogenation catalyst
Author/Authors :
Kovnir، نويسنده , , K. and Armbrüster، نويسنده , , M. and Teschner، نويسنده , , D. and Venkov، نويسنده , , T.V. and Szentmiklَsi، نويسنده , , L. and Jentoft، نويسنده , , F.C. and Knop-Gericke، نويسنده , , A. and Grin، نويسنده , , Yu. and Schlِgl، نويسنده , , R.، نويسنده ,
Issue Information :
هفته نامه با شماره پیاپی سال 2009
Pages :
9
From page :
1784
To page :
1792
Abstract :
The structurally well-defined intermetallic compound PdGa – a highly selective catalyst for the semi-hydrogenation of acetylene – was characterized by Fourier transform infrared spectroscopy (FTIR) in situ X-ray photoelectron spectroscopy and in situ prompt gamma activation analysis. A strong modification of the electronic states in PdGa compared to elemental Pd was revealed as well as the complete isolation of the Pd atoms on the surface of PdGa. In situ investigations proved the high stability of the surface, thus excluding segregation phenomena (common for alloys) or sub-surface chemistry involving C and/or H atoms (known for elemental Pd). By suppressing the sub-surface chemistry, the electronic modification as well as the site isolation lead to the high selectivity and long-term stability of PdGa in the semi-hydrogenation of acetylene.
Keywords :
Site isolation , PdGa , Intermetallic compound , X-ray photoelectron spectroscopy , Fourier transform infrared spectroscopy , In situ characterization , Prompt gamma activation analysis , Acetylene hydrogenation
Journal title :
Surface Science
Serial Year :
2009
Journal title :
Surface Science
Record number :
1685609
Link To Document :
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