The roles of chlorine and sulfur in bimetallic Pt-Re/Al2O3 reforming catalyst

Colloidal and microemulsion synthesis of rhenium nanoparticles in aqueous medium

“…500 • C and 15 atm [11]. The Re catalysts have been found to be resistant to poisoning by sulfur and carbon monoxide [12,13]. Important expectations have been laid on Re and Pt-Re catalysts in the aqueous phase reforming of biomass materials [14,15].…”

Catalytic Reforming

“…1.10. Michel et al [44] have observed that after sui phi ding and hydrogen stripping only 10% of the Pt and all of the Re was covered with irreversibly adsorbed S. This has been attributed to the much lower electron affinity of Re [45], and the increases in the electron affinity of Pt by the Re-S bond. It has been demonstrated that sulphur is preferentially bound to the Re atom.…”

Rhenium-containing catalysts in reactions of organic compounds

“…It has been confirmed by the TPR and XANES methods that the chloride present on the Al 2 O 3 surface plays the main role in the formation of an alloy between Pt and Re during the reduction process. 166 The rhenium on the Al 2 O 3 surface (tentatively in the form of an oxide) is mobile. In the presence of sulfur, the activity of the Pt, Re catalyst in the hydrogenation ± dehydrogenation reactions falls, The irreversibly adsorbed sulfur binds the entire rhenium in the form of Re 2 S and * 10% of platinum in the form of Pt 2 S. With increase in the fraction of rhenium, the undesirable sensitivity of the catalyst to sulfur increases.…”