<P><B>Abstract</B></P> <P>Historically, Pt/LTA (<I>e.g</I>., Pt/NaA) has often been used as a model catalyst for studying the catalytic functions of hydrogen spillover (H spillover). Notably, none of the work...
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https://www.riss.kr/link?id=A107520832
2015
-
SCI,SCIE,SCOPUS
학술저널
26-34(9쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P><B>Abstract</B></P> <P>Historically, Pt/LTA (<I>e.g</I>., Pt/NaA) has often been used as a model catalyst for studying the catalytic functions of hydrogen spillover (H spillover). Notably, none of the work...
<P><B>Abstract</B></P> <P>Historically, Pt/LTA (<I>e.g</I>., Pt/NaA) has often been used as a model catalyst for studying the catalytic functions of hydrogen spillover (H spillover). Notably, none of the works reported appreciable catalytic activities for Pt/LTA alone, while markedly enhanced activities were reported after physical dilution with some acidic oxides. It was often speculated without experimental evidence that activated hydrogen generated from Pt/LTA can migrate to the diluents surface (“inter-particular” H spillover) where organic reactants can react with spilt-over hydrogen. In this work, we carefully studied benzene hydrogenation activities of Pt/NaA and its decationized form (Pt/HA), before and after the physical dilution with various metal oxides possessing different Lewis and Brønsted acidity. The originally negligible activity of Pt/NaA increased significantly after mixing with various acidic oxides. The physical dilutions, however, resulted in a significant alteration of Pt/NaA structure due to solid-state H<SUP>+</SUP> exchange, which made the catalytic interpretation vague. In contrast, Pt/HA structure did not change after the dilutions, and thus could be used as an ideal catalytic model system for studying inter-particular H spillover. The catalytic results showed that Al-rich metal oxides with abundant Lewis acid sites are effective for enhancing the catalytic activity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Catalytic effects of physically diluting Pt/NaA and Pt/HA with various acidic metal oxides were studied. </LI> <LI> Physical dilution altered the original structure of Pt/NaA due to solid-state H<SUP>+</SUP>-exchange. </LI> <LI> Physical dilution did not change the structure of decationized form of Pt/NaA (Pt/HA). </LI> <LI> Dilution with Al-rich metal oxides can markedly enhance the catalytic activity of Pt/HA. </LI> <LI> Lewis acid sites may play a significant role in the catalytic use of hydrogen spillover. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>