Surface Structure Modulating Of Ni-Pt Bimetallic Catalysts Boosts N-Dodecane Steam Reforming

Surface structure of bimetallic catalysts plays a vital role in converting liquid hydrocarbon fuels to on-site H-2 for fuel cell application via steam reforming process. Herein, Pt-outer (Pt-Ni/Al2O3), Pt-outer & inner (NiPt/Al2O3) and Pt-inner (Ni-Pt/Al2O3) catalysts prepared through sequential impregnation and co-impregnation method were employed in n-dodecane steam reforming. Performance results showed that the activity was as followed: NiPt/Al2O3 > NiPt/Al2O3 > Pt-Ni/Al2O3. Characterization results from XRD, H-2-TPR, XPS, STEM-EDX, in situ CO DRIFT and EXAFS suggest that Ni-Pt/Al2O3 catalyst was more preferable to form Nix+ species and NiPt alloy compared with Pt-Ni/Al2O3 and NiPt/Al2O3 catalysts. C2H6-TPSR and H2O-TPSR experimental indicated that NiPt/Al2O3 catalyst and Nix+ species mostly contributed to C-C, C-H bond and H2O activation. The superior activity of Ni-Pt/Al2O3 bimetallic catalyst in n-dodecane steam reforming linked with the synergistic effect between Ni-enriched surface, Nix+ species and NiPt alloy which facilitated CHx group formation, H2O activation and CHx group oxidation.