Abstract
The activation of Ni-TiO2 catalysts prepared via both impregnation on commercial TiO2 and by ion exchange on hydrous titanium oxide (HTO) supports was investigated. The reactivity of these catalysts for a structure-sensitive reaction (n-butane hydrogenolysis) was investigated as a function of different activation treatments (temperature, time) in a H2 atmosphere. Complete activation of the ion exchanged Ni/HTO catalyst in H2 required temperatures > 623 K and times > 18 h. Low temperature (573 K) activation of the ion exchanged Ni/HTO catalyst in H2 was not possible without performing a mild (573 K) reduction/oxidation/reduction cycle. Observations of the ion exchanged Ni/HTO catalyst microstructures by transmission electron microscopy revealed that inactive samples contained a distinct film which covered Ni particle surfaces. The exact nature of this film has not yet been determined; experimental evidence is consistent with the film being composed of either carbonaceous residue or TiO x which has migrated to the Ni particle surfaces from the bulk support phase.
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Gardner, T.J., Peden, C.H.F. & Datye, A.K. Activation behavior of Ni/hydrous titanium oxide (HTO) catalysts. Catal Lett 15, 111–122 (1992). https://doi.org/10.1007/BF00770904
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DOI: https://doi.org/10.1007/BF00770904