✍ Scribed by Francisco J. Maldonado-Hodár; José Rivera-Utrilla; Ana M. Mastral; M.Teresa Izquierdo
No coin nor oath required. For personal study only.
Mo-catalysed hydrogenation processes of four coals, ranked between lignite B and high volatile bituminous coals, are studied. Ammonium heptamolybdate was used as a catalyst precursor. Hydrogenations were carried out at 300, 350 and 400 "C at a hydrogen pressure of 10 MPa, with reaction times ranging from 5 to 30 min. The maximum rate of the process, related to the textural characteristics of the coal, was calculated from the relationship between the conversion time and the reaction time. The results indicate that at 300 "C the catalyst is not active and the reaction mainly depends on the efficiency of the mass transfer process and thus on the coal macropore volume. At higher temperatures, however, the process takes place catalytically and in this case the catalytic activity is influenced by the coal surface.
📜 SIMILAR VOLUMES
The hydrogenation of 24 coals (LV bituminous to lignite) in the presence of Mo was studied. The hydrogenation temperatures were 300, 350 and 400°C, the hydrogen pressures 5 and 10 MPa, and the reaction time 30 min. At 300°C the Mo salts deposited on the coals do not decompose to the active MoS2 stat