Oxidative dehydrogenation of ethane on diluted or promoted nickel oxide catalysts: Influence of the promoter/diluter
نویسندگان
چکیده
Ti- and Nb- containing NiO catalysts have been synthesized by two different preparation methods: i) precipitation (Me-Ni-O oxides, Me = Nb or Ti), in order to prepare promoted catalysts; ii) wet impregnation on TiO2 NbOx supports, diluted/supported catalysts. The also characterized tested the oxidative dehydrogenation of ethane. catalytic performance Nb-promoted strongly depends composition, although both cases optimal one is found at similar Ti loadings (ca. 90 wt% NiO), showing ethylene selectivity ODH ethane 90% 10–20% conversion). However, case diluted catalysts, behavior Nb-containing drastically different. Then, over TiO2-diluted catalyst, highest selectivity) achieved loading 20 wt.%. Nb2O5-diluted was lower than 70%. A discussion characteristics selective done. In this case, best must present a low concentration free Nb2O5 phases, maximizing Ni-O-Ti Ni-O-Nb interaction. Interestingly, takes place depending method nature promoted/diluter. with has related interaction surface Nb2O5, which hinders elimination unselective electrophilic O species.
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ژورنال
عنوان ژورنال: Catalysis Today
سال: 2021
ISSN: ['0920-5861', '1873-4308']
DOI: https://doi.org/10.1016/j.cattod.2019.06.063