TIN PLATINUM ON ALUMINA AS CATALYST FOR DEHYDROGENATION OF ISOBUTANE - INFLUENCE OF THE PREPARATION PROCEDURE AND OF THE ADDITION OF LITHIUM ON THE CATALYTIC PROPERTIES/
Gj. Siri et al., TIN PLATINUM ON ALUMINA AS CATALYST FOR DEHYDROGENATION OF ISOBUTANE - INFLUENCE OF THE PREPARATION PROCEDURE AND OF THE ADDITION OF LITHIUM ON THE CATALYTIC PROPERTIES/, Industrial & engineering chemistry research, 36(11), 1997, pp. 4821-4826
A series of monometallic and bimetallic Pt and PtSn catalysts, modifie
d or not by the addition of Li, was studied in the dehydrogenation of
isobutane to isobutene reaction. Special emphasis was devoted to the b
ehavior of catalysts obtained following different preparation procedur
es. In relation to the addition of lithium, a strong dependence of the
catalytic properties on the order in which Li was added was observed.
Two alternatives were analyzed: (a) the support was modified by addin
g lithium onto it, and then it was impregnated with the metallic precu
rsors; (b) the support was impregnated with the metallic precursors an
d afterward lithium was added. The application of surface organometall
ic chemistry on metals (SOMC/M) techniques for the preparation of PtSn
bimetallic catalysts led to solids having a better performance than w
hen conventional techniques (successive impregnations with inorganic p
recursors) were used. Selectivities close to 100% at a high level of a
ctivity were obtained when lithium was added on PtSn catalyst (alterna
tive b) prepared from SOMC/M techniques. These systems also showed a g
ood performance in deactivation-regeneration cycles.