Abstract
PtPd and Li–PtPd catalysts were prepared by incipient wetness impregnation of the sol–gel prepared mixed γ-Zr phosphate–SiO 2 carrier. The catalytic behavior of the Li-modified and its Li-free PtPd/ZPS systems was compared in the simultaneous hydrogenation (HYD) of toluene and naphthalene (NP) in the presence of dibenzothiophene (DBT). Irrespective of the reacting molecule, the Li-modified sample showed higher activity at zero time than its Li-free counterpart. The binding energies of Pt4f 7/2 and Pd3d 5/2 levels for the Li–PtPd sample were lower than for the PtPd counterpart. This observation suggests that the enhancement in activity at short times on-stream of the Li–PtPd catalyst might be due to the interaction of Li with the support surface that then weakens the metal–support interaction. At times on-stream operation longer than 1 h, the H 2S produced in the hydrodesulfurization of dibenzothiophene tends to eliminate the beneficial effect of Li.
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