Surface Chemistry of Tribochemical Reactions: Molecular Beam Experiments

Lara-Romero, J., Maya-Yescas, R., Rico-Cerda, J. L., Rivera-Rojas, J. L., Chinas Castillo, F., Kaltchev, M. and Tysoe, W. T. Surface Chemistry of Tribochemical Reactions: Molecular Beam Experiments Chemical Papers, Vol.59, No. 6b, 2005, 481-486

Document type: Článok z časopisu / Journal Article
Collection: Chemical papers  
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Author(s) Lara-Romero, J.
Maya-Yescas, R.
Rico-Cerda, J. L.
Rivera-Rojas, J. L.
Chinas Castillo, F.
Kaltchev, M.
Tysoe, W. T.
Title Surface Chemistry of Tribochemical Reactions: Molecular Beam Experiments
Journal name Chemical Papers
Publication date 2005
Year available 2005
Volume number 59
Issue number 6b
ISSN 0366-6352
Start page 481
End page 486
Place of publication Poland
Publisher Versita
Collection year 2005
Language english
Subject 290000 Engineering and Technology
290600 Chemical Engineering
Abstract/Summary The thermal decomposition of model chlorine- and sulfur-containing extreme-pressure lubricant additives on clean iron was studied in ultrahigh vacuum conditions using molecular beam strategies. Methylene chloride and chloroform react to deposit a solid film consisting of FeCl2 and carbon, and evolve only hydrogen into the gas phase. No gas-phase products and less carbon on the surface are detected in the case of carbon tetrachloride. Dimethyl and diethyl disulfide react on clean iron to deposit a saturated sulfur plus carbon layer at low temperatures (∼ 600 K) and an iron sulfide film onto an Fe + C underlayer at higher temperatures (∼ 950 K). Methane is the only gas-phase product when dimethyl disulfide reacts with iron. Ethylene and hydrogen are detected when diethyl disulfide is used.
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