title: The Pt-enriched PtNi alloy surface and its excellent catalytic performance in hydrolytic hydrogenation of cellulose.
abstract: Ni-based catalysts are currently a subject of intense research in the hydrolytic hydrogenation of cellulose. We previously reported that Ni/ZSM-5 catalyst gave high yield of hexitols. However, Ni-based catalysts suffered fast deactivation in hot-compressed water. In this follow-up study we designed highly active Ni-based bimetallic catalysts with excellent hydrothermal stability for the hydrolytic hydrogenation of microcrystalline cellulose. PtNi/ZSM-5 shows a 76.9 % yield of hexitols, which is the best obtained so far in the hydrolytic hydrogenation of microcrystalline cellulose over Ni-based catalysts. Furthermore, the yield of hexitols remained greater than 55 % after the catalyst was reused for 4 times. The results showed that PtNi nanoparticles were formed with a Pt-enriched alloy surface as confirmed by XRD, H2-TPR (temperature-programmed H2 reduction), XPS (X-ray photoelectron spectroscopy), and H2-TPD (temperature-programmed H2 desorption). The surface features of these nano-particles were characterized by CO-TPD (temperature-programmed CO desorption), CO-FTIR (CO adsorption FTIR spectroscopy), HRTEM (high resolution TEM), and O2-TPO (temperature programmed oxidation) and this special surface structure may be responsible for the high activity, selectivity, and stability in the hydrolytic hydrogenation of cellulose in hot-compressed water.
authors.affiliation: State Key Laboratory of Electroanalytical Chemistry, Laboratory of Green Chemistry and Process, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences Changchun 130022 (PR China), Fax: (+86) 431-85262410.
authors.forename: Guanfeng
authors.initials: G
authors.lastname: Liang
authors.forename: Limin
authors.initials: L
authors.lastname: He
authors.forename: Masahiko
authors.initials: M
authors.lastname: Arai
authors.forename: Fengyu
authors.initials: F
authors.lastname: Zhao
mesh_terms: D000497:Alloys / Q000737:chemistry*; D056804:Biofuels; D002384:Catalysis; D002482:Cellulose / Q000737:chemistry*; D006865:Hydrogenation; D006868:Hydrolysis; D053758:Nanoparticles / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010084:Oxidation-Reduction; D056951:Photoelectron Spectroscopy; D010984:Platinum / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D014961:X-Ray Diffraction
chemical_list: D000497:Alloys; D056804:Biofuels; D010984:Platinum; D009532:Nickel; D002482:Cellulose
keywords: bimetallic catalyst; cellulose; hexitols; hydrogenation; ptni