Abstract
Oxygen Chemisorption on unsupported MoS 2 and commercial hydrotreating catalysts was studied as a function of adsorption pressure and temperature and as a function of measurement technique. Chemisorption measurements were made using conventional static adsorption and pulse-flow Chromatographic methods. Oxygen uptakes measured by either technique were found to be highly temperature dependent, while only slightly dependent on pressure. Static adsorption measurements at −78 °C and pulse-flow measurements at 25 °C were found to be reproducible, well correlated and the most suitable for avoiding bulk oxidation effects. The effects of preadsorbed H 2S on oxygen uptake were investigated and found to be significant. In the case of the commercial HDS/HDN catalysts, the order of hydrodesulfurization (HDS) activity was predicted by the measured oxygen uptake while hydrodenitrogenation (HDN) activity was not.
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