Abstract
Although cobalt is an important Fischer-Tropsch catalyst, there is only limited fundamental knowledge about the factors determining the elementary steps, such as the dissociation of CO, the influence of adsorbed oxygen and the formation of oxygenates as by-products. To contribute to a deeper understanding in that respect, a well-defined model consisting of Co nanoparticles supported on an epitaxial alumina film has been studied under UHV conditions. The adsorption properties of these particles have been characterized by temperature-programmed desorption (TPD) spectroscopy and photoelectron spectro-scopy. The results show that a significant part of adsorbed CO dissociates on the particles and that oxygen has a drastic influence on the CO adsorption by weakening the adsorbate-particle interaction. In case of large oxygen amounts, CoO forms which could not be reduced in our experiments, neither by CO nor by hydrogen. Additionally, the decomposition of methanol (as a possible by-product in the Fischer-Tropsch reaction) has been studied. Here, complete dehydrogenation to carbon monoxide and hydrogen was observed. Therefore, according to the principle of microscopic reversibility, there must be a possible pathway of methanol formation on Co, i.e., a CO hydrogenation route without C-O bond scission.
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Nowitzki, T., Zielasek, V., Bäumer, M. (2009). UHV Studies on CO and Methanol Adsorption and Decomposition on Pristine and Oxidized Alumina-Supported Co Nanoparticles. In: Cat, D.T., Pucci, A., Wandelt, K. (eds) Physics and Engineering of New Materials. Springer Proceedings in Physics, vol 127. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-88201-5_12
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