ISSN:
1572-879X
Keywords:
CH x species
;
carbide
;
methanation
;
hydrogenation
;
nickel
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract The CH x species formed on Ni(100) by hydrogenation of carbidic carbon have been detected using high resolution electron energy-loss spectroscopy (HREELS). Exposures of carbidic carbon to 1×10−7 Torr H2 and D2 at 313 K for 20 min produce CH x and CD x species, respectively. These species are identified by two energy-loss peaks for CH x at 2970 and 1380 cm−1 and only one peak for CD x at 1980 cm−1. Because of the existence of the intense peak at 1380 cm−1, in the range of a scissors mode for CH2 and a symmetric deformation mode for CH3, the CH x species are tentatively ascribed to CH2 and/or CH3. The CD x species undergo decomposition at 330–370 K in UHV as well as in hydrogen below 10−7 Torr. No stable CH x species are observed above 400 K, which is lower than the normal reaction temperature of the methanation reaction (500 K).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00764898
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