H. Vidal et al., Catalytic behavior of lanthana promoted Rh/SiO2 catalysts: influence of the preparation procedure, APP CATAL A, 208(1-2), 2001, pp. 111-123
Benzene hydrogenation and n-butane hydrogenolysis reactions have been teste
d on a series of Rh/La2O3/SiO2 catalysts, their catalytic properties bring
compared with those of a Rh/SiO2 sample studied as reference. This investig
ation has revealed that both activity and selectivity can be controlled by
the procedure followed to prepare the catalysts. In particular, the influen
ce of preparative conditions such as the lanthana loading, method of introd
uction of the metal and promoter (either consecutive or by co-impregnation)
and temperature of calcination (873 or 1173 K) of the intermediate La2O3/S
iO2 phase onto which the noble metal is later deposited, have been analyzed
. The differences in the catalytic behavior have been correlated with the L
a2O3/SiO2 interactions. leading to a different degree of surface hydroxylat
ion and different Rh particle crystallinity. (C) 2001 Elsevier Science B.V.
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