کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5425942 | 1395870 | 2011 | 7 صفحه PDF | دانلود رایگان |
Methanethiol adsorbed on Ru(0Â 0Â 0Â 1)-p(2Â ÃÂ 2)O has been studied by TPD and XPS. The dissociation of methanethiol to methylthiolate and hydrogen at 90Â K is evidenced by the observation of hydroxyl and water. The saturation coverage of methylthiolate is â¼0.15Â ML, measured by both XPS and TPD. A detailed analysis suggests that only the hcp-hollow sites have been occupied. Upon annealing the surface, water and hydroxyl desorb from the surface at â¼210Â K. Methylthiolate decomposes to methyl radical and atomic sulphur via C-S cleavage between 350 and 450Â K. Some methyl radicals (0.05Â ML) have been transferred to Ru atoms before they decompose to carbon and hydrogen. The rest of methyl radicals desorb as gaseous phase. No evidence for the transfer of methyl radical to surface oxygen has been found.
Journal: Surface Science - Volume 601, Issue 9, 1 May 2007, Pages 2005-2011