Selective PdZn Alloy Formation in the Reduction of Pd/ZnO Catalysts

Temperature programmed reduction (TPR) experiments were carried out over Pd/ZnO with different Pd loadings. Combined results with an X-ray diffraction method and X-ray photoelectron spectroscopy showed that a Pd–Zn alloy with a structure of PdZn was selectively produced in the course of TPR of Pd/ZnO. It was suggested that hydrogen retained in Pd spilled over to ZnO. The ZnO was reduced to metallic Zn, being converted to PdZn. The molar amounts of the ZnO reduced were practically the same as the those of Pd loaded. Hence, all the Pd loaded was completely transformed to the PdZn alloys upon reduction.

[1]  K. Tomooka,et al.  1,2-Carbamoyl Migration on Enantio-enriched α-Lithioalkyl Carbamates Generated with s-Butyllithium/Sparteine: Steric Course and Mechanism , 1999 .

[2]  N. Iwasa,et al.  Dehydrogenation of methanol to methyl formate over supported Ni, Pd and Pt catalysts. Anomalous catalytic functions of PdZn and PtZn alloys , 1995 .

[3]  N. Iwasa,et al.  Steam reforming of methanol over Ni, Co, Pd and Pt supported on ZnO , 1995 .

[4]  Satoshi Masuda,et al.  Highly selective supported Pd catalysts for steam reforming of methanol , 1993 .

[5]  L. Guczi,et al.  Hydrogenation of 1-Butene and 1,3-Butadiene Mixtures over Pd/ZnO Catalysts , 1993 .

[6]  C. Leighton,et al.  Further characterisation of Pd deposited on an extensively oxidised Zn(001) support , 1991 .

[7]  T. Nevell,et al.  Oxidation state of the surface of palladium in the catalytic combustion of hydrogen , 1991 .

[8]  O. Yamamoto,et al.  Dehydrogenation of methanol to methyl formate over palladium/zinc oxide catalysts , 1991 .

[9]  H. Praliaud,et al.  X-ray photoelectron spectroscopic study of the electronic state of palladium in alkali metal doped Pd/SiO2 solids , 1990 .

[10]  C. Yeh,et al.  Effect of Reduction and Oxidation Treatments on Pd/ZnO Catalysts , 1989 .

[11]  M. Laborde,et al.  Copper catalysts for the steam reforming of methanol : Analysis of the Preparation Variables , 1988 .

[12]  A. Watanabe,et al.  Production of synthesis gas with various compositions of H2, CO, and CO2 from methanol and water on a Ni-K/Al2O3 catalyst. , 1986 .

[13]  P. Wehner,et al.  XPS study of the reduction and reoxidation of ZnO-supported palladium , 1984 .

[14]  N. Takezawa,et al.  Methanol-reforming reaction over copper-containing catalysts—The effects of anions and copper loading in the preparation of the catalysts by kneading method , 1981 .

[15]  N. Takezawa,et al.  METHANOL REFORMING REACTION OVER COPPER-CONTAINING MIXED OXIDES , 1976 .

[16]  N. Winograd,et al.  X-ray photoelectron spectroscopic studies of palladium oxides and the palladium-oxygen electrode , 1974 .

[17]  E. Miyazaki,et al.  Decomposition of Methanol on Nickel and Copper Surfaces , 1971 .