Based on the propensity of surface atomic oxygen O(a) to react fiercely with H(a) on Pt(111) to form water that desorbs at low temperature, we have developed a thermal reaction and desorption technique—predosed oxygen temperature programmed desorption (POTPD)—which is useful for probing the kinetics of dehydrogenation on Pt(111). The method relies on very low coverages of O(a) which react with available adsorbed atomic H to form water, which desorbs promptly. Thus, the H2O temperature programmed desorption reflects the dehydrogenation process. We have successfully utilized POTPD to determine the dehydrogenation temperatures of methylene (CD2), methyl (CD3), vinyl (CHCH2), ethylene (C2D4), ethyl (C2D5), thioethoxy (SC2H5), and diethyl sulfide [S(C2H5)2] on Pt(111). From the data, a mechanism and kinetic parameters for vinyl to ethylidyne conversion are presented.
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July 1993
39th National Symposium of the American Vacuum Society
9−13 Nov 1992
Chicago, Illinois (USA)
Research Article|
July 01 1993
Predosed oxygen temperature programmed desorption as a kinetic probe of dehydrogenation on Pt(111)
X.‐L. Zhou;
X.‐L. Zhou
Department of Chemistry and Biochemistry, University of Texas, Austin, Texas 78712
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J. M. White
J. M. White
Department of Chemistry and Biochemistry, University of Texas, Austin, Texas 78712
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J. Vac. Sci. Technol. A 11, 2210–2216 (1993)
Article history
Received:
September 25 1992
Accepted:
March 22 1993
Citation
X.‐L. Zhou, J. M. White; Predosed oxygen temperature programmed desorption as a kinetic probe of dehydrogenation on Pt(111). J. Vac. Sci. Technol. A 1 July 1993; 11 (4): 2210–2216. https://doi.org/10.1116/1.578394
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