Novel synthetic approaches and TWC catalytic performance of flower-like Pt/CeO₂

Abstract

A novel Ultrasonic Assisted Membrane Reduction (UAMR)-hydrothermal method was used to prepare flower-like Pt/CeO₂ catalysts. The texture, physical/chemical properties, and reducibility of the flower-like Pt/CeO₂ catalysts were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), N₂ adsorption, and hydrogen temperature programmed reduction (H₂-TPR) techniques. The catalytic performance of the catalysts for treating automobile emission was studied relative to samples prepared by the conventional wetness impregnation method. The Pt/CeO₂ catalysts fabricated by this novel method showed high specific surface area and metal dispersion, excellent three-way catalytic activity, and good thermal stability. The strong interaction between the Pt nanoparticles and CeO₂ improved the thermal stability. The Ce⁴⁺ ions were incorporated into the surfactant chains and the Pt nanoparticles were stabilized through an exchange reaction of the surface hydroxyl groups. The SEM results demonstrated that the Pt/CeO₂ catalysts had a typical three-dimensional (3D) hierarchical porous structure, which was favorable for surface reaction and enhanced the exposure degree of the Pt nanoparticles. In brief, the flower-like Pt/CeO₂ catalysts prepared by UAMR-hydrothermal method exhibited a higher Pt metal dispersion, smaller particle size, better three-way catalytic activity, and improved thermal stability versus conventional materials.

Keywords

Ultrasonic Assisted Membrane Reduction (UAMR) / Pt nanoparticles / three-way catalyst / flower-like

References

[1] HeH, DaiH X, NgL H, WongK W, AuC T. Pd-, Pt-, and Rh-Loaded Ce0.6Zr0.35Y0.05O2 three-way catalysts: an investigate on performance and redox properties. Journal of Catalysis, 2002, 206(1): 1-13

[2] IkryannikovaL N, AksenovA A, MarkaryanG L, MuravévaG P, KostyukB G, KharlanovA N, LuninaE V. The redox treatments influence on the structure and properties of M₂O₃-CeO₂-ZrO₂ (M=Y, La) solid solutions. Applied Catalysis A, General, 2001, 210(1-2): 225-235

[3] HeoI, ChoungJ W, KimP S, NamI S, SongY I, InC B, YeoG K. The alteration of the performance of field-aged Pd-based TWCs towards CO and C₃H₆ oxidation. Applied Catalysis B: Environmental, 2009, 92(1-2): 114-125

[4] PapavasiliouA, TsetsekouA, MatsoukaV, KonsolakisM, YentekakisI V. An investigation of the role of Zr and La dopants into Ce₁-_x-_yZr_xLa_yO_δ enriched γ-Al₂O₃ TWC washcoats. Applied Catalysis A: General, 2010, 382 (1, 30): 73-84

[5] PapavasiliouA, TsetsekouA, MatsoukaV, KonsolakisM, YentekakisI V, BoukosN. Development of a Ce-Zr-La modified Pt/γ-Al₂O₃ TWCs washcoat: effect of synthesis procedure on catalytic behavior and thermal durability. Applied Catalysis B: Environmental, 2009, 90(1-2): 162-174

[6] PapavasiliouA, TsetsekouA, MatsoukaV, KonsolakisM, YentekakisbI V, BoukosN. Synergistic structural and surface promotion of monometallic (Pt) TWCs: effectiveness and thermal aging tolerance. Applied Catalysis B: Environmental, 2011, 106(1-2): 228-241

[7] CourtoisX, PerrichonV. Distinct roles of copper in bimetallic copper-rhodium three-way catalysts deposited on redox supports. Applied Catalysis B: Environmental, 2005, 57(1-15): 63-72

[8] JooS H, ParkJ Y, TsungC K, YamadaY, YangP D, SomorjaiG A. Thermally stable Pt/mesoporous silica core-shell nanocatalysts for high-temperature reactions. Nature Materials, 2009, 8(2): 126-131

[9] LimB, JiangM J, CamargoP H C, ChoE C, TaoJ, LuX M, ZhuY M, XiaY N. Pd-Pt bimetallic nanodendrites with high activity for oxygen reduction. Science, 2009, 324(5932): 1302-1305

[10] QiaoB T, WangA Q, YangX F, AllardL F, JiangZ, CuiY T, LiuJ Y, LiJ, ZhangT. Single-atom catalysis of CO oxidation using Pt₁/FeO_x. Nature Chemistry, 2011, 3(8): 634-641

[11] LiuL C, GuanX, LiZ M, ZiX H, DaiH X, HeH. Supported bimetallic AuRh/γ-Al₂O₃ nanocatalyst for the selective catalytic reduction of NO by propylene. Applied Catalysis B: Environmental, 2009, 90(1-2): 1-9

[12] LiuL C, WeiT, ZiX H, HeH, DaiH X. Research on assembly of nano-Pd colloid and fabrication of supported Pd catalysts from the metal colloid. Catalysis Today, 2010, 153(3-4): 162-169

[13] ChenG Z, XuC X, SongX Y, XuS L, DingY, SunS X. Template-free synthesis of single crystallinelike CeO₂ hollow nanocubes. Crystal Growth & Design, 2008, 8(12): 4449-4453

[14] PanC S, ZhangD S, ShiL Y, FangJ H. Template-free synthesis, controlled conversion, and CO oxidation properties of CeO₂ nanorods, nanotubes, nanowires, and nanocubes. European Journal of Inorganic Chemistry, 2008, 2008(15): 2429-2436

[15] YuR B, YanL, ZhengP, ChenJ, XingX R. Controlled synthesis of CeO₂ flower-like and well-aligned nanorod hierarchical architectures by a phosphate-assisted hydrothermal route. Journal of Physical Chemistry C, 2008, 112(50): 19896-19900

[16] HanW Q, WuL J, ZhuY M. Formation and oxidation state of CeO(_2-x) nanotubes. Journal of the American Chemical Society, 2005, 127(37): 12814-12815

[17] WangS R, ZhangJ, JiangJ Q, LiuR, ZhuB L, XuM, WangY, CaoJ, LiM, YuanZ, ZhangS, HuangW, WuS. Porous ceria hollow microspheres: synthesis and characterization. Microporous and Mesoporous Materials, 2009, 123(1-3): 349-353

[18] ZhongL S, HuJ S, CaoA M, SongW G, WanL J. 3D flowerlike ceria micro/nanocomposite structure and its application for water treatment and CO removal. Chemistry of Materials, 2007, 19(7): 1648-1655

[19] SunC W, SunJ, XiaoG L, ZhangH R, QiuX P, LiH, ChenL Q. Mesoscale organization of nearly monodisperse flower like ceria microspheres. Journal of Physical Chemistry B, 2006, 110(27): 13445-13452

[20] LiH F, LuG Z, DaiQ G, WangY Q, GuoY, GuoY L. Hierarchical organization and catalytic activity of high-surface-area mesoporous ceria microspheres prepared via hydrothermal routes. Appied Materials and Interfaces, 2010, 2(3): 838-846

[21] ZhouH P, WuH S, ShenJ, YinA X, SunL D, YanC H. Thermally stable Pt/CeO₂ hetero-nanocomposites with high catalytic activity. Journal of the American Chemical Society, 2010, 132(14): 4998-4999

[22] RiouxR M, HsuB B, GrassM E, SongH, SomorjaiG A. Influence of particle size on reaction selectivity in cyclohexene hydrogenation and dehydrogenation over silica-supported mono-disperse Pt particles. Catalysis Letters, 2008, 126(1-2): 10-19

[23] WeiY C, LiuJ, ZhaoZ, ChenY S, XuC M, DuanA J, JiangG Y, HeH. Highly active catalysts of gold nanoparticles supported on three-dimensionally ordered macroporous LaFeO₃ for soot oxidation. Angewandte Chemie International Edition, 2011, 50(10): 2326-2329

[24] WeiY C, LiuJ, ZhaoZ, DuanA J, JiangG Y, XuC M, GaoJ S, HeH, WangX P. Three-dimensionally ordered macroporous Ce₀.₈Zr₀.₂O₂-supported gold nanoparticles: synthesis with controllable size and super-catalytic performance for soot oxidation. Energy and Environmental Science, 2011, 4(8): 2959-2970

[25] KangS B, KwonH J, NamI S, SongY I, OhS H. Activity function for describing alteration of three way catalyst performance over palladium only three way catalysts by catalyst mileage. Industrial & Engineering Chemistry Research, 2011, 50(9): 5499-5509

[26] ConcepcionP, CormaA, SilvestreA. Chemoselective hydrogenation catalysts: Pt on meso-structured CeO₂ nanoparticles embedded within ultrathin layers of SiO₂ binder. Journal of American ChemistrySociety, 2004, 126(17): 5523-5532

[27] EllisA V, WilsonM A. Carbon exchange in hot alkaline degradation of glucose. Journal of Organic Chemistry, 2002, 67(24): 8469-8474

[28] SunC W, LiH, ZhangH R, WangZ X, ChenL Q. Controlled synthesis of CeO₂ nanorods by a solvothermal method. Nanotechnology, 2005, 16(9): 1454-1463

[29] TerribileD, TrovarelliA, LlorcaJ, LeitenburgC D, DolcettiG. The synthesis and characterization of mesoporous high-surface area ceria prepared using a hybrid organic/inorganic route. Journal of Catalysis, 1998, 178(1): 299-308

[30] YangB Y, MontgomeryR. Alkaline degradation of glucose: effect of initial concentration of reactants. Carbohydrate Research, 1996, 280(1): 27-45

[31] HinokumaS, FujiiH, OkamotoM, IkeueK, MachidaM. Metallic Pd nanoparticles formed by Pd-O-Ce interaction: a reason for sintering induced activation for CO oxidation. Chemistry of Materials, 2010, 22(22): 6183-6190

[32] ShinjohH, HatanakaM, NagaiY, TanabeT, TakahashiN, YoshidaT, MiyakeY. Suppression of noble metal sintering based on the support anchoring effect and its application in automotive three way catalysis. Topics in Catalysis, 2009, 52(13-20): 1967-1971

[33] NagaiY, HirabayashiT, DohmaeK, TakagiN, MinamiT, ShinjohH, MatsumotoS. Sintering inhibition mechanism of platinum supported on ceria-based oxideand Pt-oxide-support interaction. Journal of Catalysis, 2006, 242(1): 103-109

[34] ZimmerP, TschöpeA, BirringerR. Temperature programmed reaction spectroscopy of ceria and Cu/Ceria supported oxide catalyst. Journal of Catalysis, 2002, 205(2): 339-345

[35] Silvestre-AlberoJ, Rodrı́guez-ReinosoF, Sepúlveda-EscribanoA. Improved metal-support interaction in Pt/CeO₂-SiO₂ catalysts after zinc addition. Journal of Catalysis, 2002, 210(1): 127-136

Acknowledgements

The authors are grateful for the National Natural Science Foundation of China (Grant Nos. 20877006 and 20833011), National Industrial Project of Rare Earth and Rare Metal New Materials and the Project funding for Academic Human Resources Development in Institutions of Higher Learning unpder the Jurisdiction of Beijing Municipality (Nos. PHR201107104 and PHR200907105). We also thank Mining and Metallurgy Research Institute of Beijing for the TEM access.

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg