Abstract

The modification of platinum-alumina catalysts by 0.1 wt% lithium does not affect to a large extent the dehydrogenating properties of platinum. However, when lithium is added to platinum through impregnation by nitrate salt in a higher content, residual nitrate species can remain on the catalyst surface, even after calcination at 773 K. These nitrate species can be coreduced with the platinum precursor and be associated to a significant sintering of the platinum particles.

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