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Evidence for cyclohexyl as a reactive surface intermediate during high-pressure cyclohexane catalytic reactions on
Minchul Yang1, Gabor A Somorjai
1Department of Chemistry, University of California, and the Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Abstract:
Sum frequency generation (SFG) surface vibrational spectroscopy has been used to identify reactive surface intermediates in situ during catalytic dehydrogenation reactions of high-pressure cyclohexane (C(6)H(12)) on the Pt(111) crystal surface in the presence and absence of high-pressure hydrogen. These experiments provide the first spectroscopic evidence of cyclohexyl (C(6)H(11)) as a reactive surface intermediate during the cyclohexane catalytic conversion to benzene at high pressure in the presence of excess hydrogen. In addition, it was proposed from temperature-dependent SFG experiments that dehydrogenation of cyclohexyl is a rate-limiting step in the cyclohexane catalytic conversion to benzene.
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