ISSN:
1572-879X
Keywords:
Catalyst activation
;
ion exchange
;
Ni
;
hydrous titanium oxide
;
n-butane hydrogenolysis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00770904
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