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Site occupation of CO adsorbed on Ni(100) at high CO pressures
Affiliation:1. Jerzy Haber Institute of Catalysis and Surface Chemistry, Niezapominajek 8, 30-239 Krakow, Poland;2. AGH University of Science and Technology, Faculty of Geology, Geophysics and Environmental Protection, al. Mickiewicza 30, 30-059 Krakow, Poland;1. Interdisciplinary Graduate Program in Advanced and Sustainable Environmental Engineering, Kasetsart University, Bangkok 10900, Thailand;2. National Center of Excellence for Petroleum, Petrochemicals and Advanced Materials, Department of Chemical Engineering, Faculty of Engineering, Kasetsart University, 50 Ngamwongwan Road, Ladyao, Jatujak, Bangkok, 10900, Thailand;3. Center for Advanced Studies in Nanotechnology and Its Applications in Chemical Food and Agricultural Industries, Kasetsart University, 50 Ngamwongwan Road, Ladyao, Jatujak, Bangkok, 10900, Thailand;4. Department of Chemistry and NANOTEC Center for Nanoscale Materials Design for Green Nanotechnology, Kasetsart University, 50 Ngamwongwan Road, Ladyao, Jatujak, Bangkok, 10900, Thailand;5. National Metal and Materials Technology Center, 114 Thailand Science Park, Thanon Phahonyothin, Tambon Khlong Nueng, Amphoe Khlong Luang, Pathum Thani, 12120, Thailand
Abstract:The adsorption of CO on Ni(100) has been investigated by infrared reflection-absorption spectroscopy in the temperature range of 85 to 300 K. At 300 K we achieved CO coverages up to 0.8 ML by applying CO pressures up to 1 mbar. The fraction of CO molecules adsorbed at terminal and bridge sites on Ni(100) at a fixed temperature depends strongly on the total CO coverage. The variation of the adsorption site occupancy with coverage is well reproduced by a lattice-gas model which takes into account the lateral interaction of the adsorbed molecules.
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