Preparation of platinum compositions supported on reduced graphite oxide and their catalytic properties in liquid-phase hydrogenation

Preparation of platinum-containing hydrogenation catalysts supported on thermally reduced graphite oxide

“…Plati num supported on TEGO is still less active (~80 mol Н 2 (mol Pt) -1 min -1 ). The activity of the platinum cat alysts supported on chemically reduced GO that were prepared in our earlier study [8] does not exceed 35 mol Н 2 (mol Pt) -1 min -1 , and the catalysts prepared by the simultaneous reduction of GO and platinum [7] show a lower activity of 10 mol Н 2 (mol Pt) -1 min -1 . Compare these data with the activities of related platinum catalysts: platinum parti cles supported on carbon materials with a graphene structure, namely, carbon nanofibers [25,26] and acti vated carbon ARV 5 (6-8 nm) show activities of 52 and 61.5 mol Н 2 (mol Pt) -1 min -1 , respectively.…”

“…The size of the platinum particles supported via reduction is mainly determined by the nature of the reductant. Irrespective of whether the support is GO [7] or the products of its chemical reduction [8] or thermal reduction (this work), the size of the platinum particles deposited on the surface via reduction with sodium tetrahydridoborate is the same and does not exceed 2 nm.…”

“…Note that the size of the deposited platinum particles is determined in this case by the nature of the reductant rather than the degree of reduction of the support. Indeed, the size of the parti cles deposited by simultaneous reduction [7] or pre reduction [8] with sodium tetrahydridoborate did not exceed 2 nm, while the size of the particles obtained using hydrazine hydrate as the reductant [7] was over 10 nm.…”

“…Platinum supported on TEG 1, like platinum on GO reduced by hydrazine hydrate [8], catalyzes the hydrogenation of 20 portions of nitrobenzene with the formation and accumulation of aniline, without completely losing its activity (Fig. 7, inset).…”

“…The material prepared by GO reduction is by no means similar to graphene in oxygen content (degree of reduction) or conductivity. In a previous study [8], we supported platinum nanoparticles on the surface of GO pre reduced by sodium tetrahydridoborate or hydrazine hydrate. It was demonstrated that GO pre reduction markedly enhances the catalytic activity of platinum systems in the liquid phase hydrogenation of the NO 2 group in nitrobenzene and C= C bonds.…”