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- W1604165763 abstract "The effect of chlorine using precursors like H 2 PtCl 6 (0.55,2 and 10 wt.% Pt) and Pt(NH 3 ) 4 (NO 3 ) 2 (2 wt.% Pt) and of the Nb 2 O 5 loading on the structure of Pt/Al 2 O 3 and its catalytic activity in methanol/deuterium exchange has been investigated. In presence of niobia the BET surface of the support increases but niobia itself remains amorphous and its presence in increasing quantities results in the easier reduction of both chlorine-containing and chlorine-free Pt samples measured by TPR. XPS provides evidence for the effect of chlorine and niobia on the reduction of Pt. After reduction Nb 2 O 5 is converted into NbO x species which may migrate on top of the Pt particles measured by XRD, CO chemisorption and O/H titration. The increased perimeter of the Pt/NbO x /Al 2 O 3 interface raises the deuterium availability across this interface, which in turn, gives rise to the interaction of methyl groups in the anchored species with Pt for multiple exchange as was assumed in Part I." @default.
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- W1604165763 date "1994-08-01" @default.
- W1604165763 modified "2023-09-27" @default.
- W1604165763 title "Promoter effect of niobia on Pt/Al 2 O 3 catalysts." @default.
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- W1604165763 doi "https://doi.org/10.1016/0304-5102(94)00073-5" @default.
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