Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/75856
Title: Decomposition of ammonia on O- and S-covered Ru(001) surfaces
Authors: Huang, H.H. 
Seet, C.S.
Xu, G.Q. 
Issue Date: 1-Oct-1994
Source: Huang, H.H.,Seet, C.S.,Xu, G.Q. (1994-10-01). Decomposition of ammonia on O- and S-covered Ru(001) surfaces. Surface Science 317 (3) : 353-360. ScholarBank@NUS Repository.
Abstract: The decomposition of ammonia on oxygen- and sulfur-modified Ru(001) surfaces was investigated at a surface temperature of 480 K using the thermal desorption technique. On an O-covered Ru(001) surface, two thermal desorption peaks of nitrogen were observed. In addition to the broad feature centered around 750 K, a sharp peak was observed at 640 K, growing in intensity with oxygen coverage. These results can be qualitatively explained by the repulsive interactions between the adsorbed nitrogen and oxygen atoms. Our work further revealed that sulfur adatoms significantly inhibit the decomposition of ammonia. At a sulfur coverage of 0.6, no nitrogen desorption could be detected. In contrast, the presence of oxygen adatoms on Ru(001) only slightly affected the amount of ammonia decomposed. The coverage of N(ads) from ammonia decomposition on an O-saturated surface was similar to that on clean Ru(001). © 1994.
Source Title: Surface Science
URI: http://scholarbank.nus.edu.sg/handle/10635/75856
ISSN: 00396028
Appears in Collections:Staff Publications

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