Study on sulfur-tolerant benzene hydrogenation catalyst based on Pt-encapsulated sodalite zeolite

The sulfur resistance, activity in benzene hydrogenation and hydrogen spillover of the Pt-encapsulated sodalite zeolite Pt/SOD-M have been investigated. The prepared of Pt/SOD-M zeolite catalyst by directly hydrothermal synthesis in the presence of Pt(NH3)4Cl2 metal precursor and subsequently performing ion exchange with aqueous nitrate solution. The characterization of framework structure, pore textural properties and the acidity of the obtained Pt/SOD-M by XRD, N2 adsorption–desorption and NH3-TPD, respectively. The hydrogen spillover of Pt/SOD-M before and after poisoning of H2S and its hybrid samples were examined by H2-TPD. Catalytic hydrogenation activity was measured by benzene hydrogenation. The results indicated that there is no catalytic hydrogenation activity for Pt/SOD-Na and Pt/SOD-K alone, whereas Pt/SOD-H and Pt/SOD ion exchanged with Mg2+, Ca2+ and Ba2+ show appreciable activity. Notably, alone Pt/SOD-H and Pt/SOD ion exchanged with Mg2+, Ca2+ and Ba2+ still show excellent catalytic benzene hydrogenation activity after poisoning of H2S. It was demonstrated that Pt/SOD-H, Pt/SOD-Mg, Pt/SOD-Ca and Pt/SOD-Ba not only can resist sulfur-poisoning, but also exhibit superior catalytic hydrogenation performance without mixing with spillover hydrogen receptor.