Study on methane conversion to syngas over nano Pt-CeO 2-ZrO 2/MgO catalysts: Structure and catalytic behavior of catalysts prepared by using ion exchange resin method

Abstract

Nano Pt-Ce0 2-Zr0 2/MgO catalysts with 0.8 wt.% Pt, 3.0 wt.% Ce0 2 and 3.0 wt.% Zr0 2 were prepared by wet impregnation mothod. Support MgO was obtained using ion exchange resin method or using commercial MgO. S BET, XRD, TEM and C0 2-TPD were used to characterize the supports and catalysts. CH 4-C0 2 reforming to synthesis gas was performed to test the catalytic behavior of the catalysts. The catalysts prepared using ion exchange resin exhibited more regular structure, more basic sites and higher stability of Pt and MgO than prepared from commercial MgO. At 1073 K, atmospheric pressure, and at high gas hourly space velocity of 36,000 mL/(g-hr) with a stoichiometric feed of CH 4 and C0 2, the catalyst supported on the MOH(GD)-IE showed a higher and more stable activity for CH 4-C0 2 reforming reaction than the catalyst prepared using commercial MgO. The characterisation results demonstrated that the high activity and stability of the catalyst stem from the high dispersion of Pt, the stable structure and the high resistance to carbon deposition on the catalyst.