Year-end Sale % OFF 
Abstract
A combined system of Raman spectroscopy and ellipsometry is developed for the study of catalyst surfaces on which a chemical reaction is taking place. The dielectric function and the thickness of a surface layer or a surface compound produced in the reaction are analyzed by ellipsometry; vibrational modes of the compound and surface species are analyzed by Raman spectroscopy, and the products in the gas phase by mass spectrometry. The system is applied to the study of the Boudouard and dissociation reactions of CO molecules on Fe and Fe 3O 4 catalysts. A surface layer produced by diffused C and O atoms, a thin oxide layer produced on the Fe by the CO dissociation reaction, and graphite layers produced by the Boudouard reaction are analyzed. Raman spectra reveal the existence of several kinds of carbon species such as defective graphite and an Fe carbide formed on the Fe and Fe 3O 4 surfaces. Specific Raman bands at 1121 and 1147 cm -1 are tentatively concluded to be produced from microscopic clusters of surface graphite. The reaction of the defective graphite with H 2 gas is found to be stepwise on a time scale of seconds.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
