Abstract
A Mo/Al 2O 3 and a NiMo/Al 2O 3 catalyst were subjected to the gas-phase hydrodesulfurization (HDS) of thiophene. The mechanism of catalyst deactivation was investigated. Sintering or modification of the active phase and blocking of the active sites or the pore structure by coke deposition were considered as possible causes. The freshly sulfided and the spent catalysts were characterized by quasi in situ TEM, IR spectroscopy on adsorbed CO, total carbon analysis, N 2 chemisorption and Hg porosimetry. For the NiMo/Al 2O 3 catalyst the main cause for deactivation is loss of sulfur during the reaction. This process is fully reversible by H 2S/H 2 treatment. In contrast coke deposition on the active sites is a major cause for deactivation of the Mo/Al 2O 3 catalyst.
Published Version
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