Infrared Reflection Absorption Spectroscopy Study of CO Adsorption and Reaction on Oxidized Pd(100)

The adsorption, desorption, and reaction of CO on the (√5×√5)R27° surface oxide on Pd(100) grown by two methods was investigated with infrared reflection absorption spectroscopy. CO multilayer desorbs at ∼40 K, whereas monolayer desorption is complete at ∼210 K. The surface oxide formed at 575 K with a 600 Langmuir (L) exposure of O2 exhibits a stronger interaction with CO compared with a surface oxide formed at 575 K with a 4500 L O2 exposure, presumably due to defects in the former. The surface oxide formed with a lower exposure of O2 exhibits enhanced reactivity with CO at 400 K. Below 60 K, O2 blocks CO adsorption on the monolayer oxide.

[1]  D. Goodman,et al.  Highly active surfaces for CO oxidation on Rh, Pd, and Pt , 2007 .

[2]  Georg Kresse,et al.  The Pd (100)-(root 5 x root 5)R27 degrees-O surface oxide: A LEED, DFT and STM study , 2007 .

[3]  M. Scheffler,et al.  CO oxidation at Pd"100…: A first-principles constrained thermodynamics study , 2007, cond-mat/0701777.

[4]  D. Goodman,et al.  CO-NO and CO-O(2) interactions on Cu(100) between 25 and 200 K studied with infrared reflection absorption spectroscopy. , 2005, The journal of physical chemistry. B.

[5]  D. Goodman,et al.  Ag Adsorption on Various Silica Thin Films , 2003 .

[6]  J. Gustafson,et al.  The Pd(100)-(√5 x √5)R27º-O surface oxide revisited , 2003, cond-mat/0304107.

[7]  E. Mccash,et al.  Low-temperature adsorption of CO on Cu(1 1 1) studied by RAIRS , 2002 .

[8]  E. Altman,et al.  The Reactivity of Surface Oxygen Phases on Pd(100) Toward Reduction by CO , 2002 .

[9]  H. Freund,et al.  Thermodesorption of CO and NO from Vacuum-Cleaved NiO(100) and MgO(100) , 1999 .

[10]  P. Thiel,et al.  Tensor LEED analysis of the Pd(100)-(√5×√5)R27°-O surface structure , 1994 .

[11]  G. Herzberg,et al.  Molecular Spectra and Molecular Structure , 1992 .

[12]  P. Thiel,et al.  Oxygen-stabilized reconstructions of Pd(100): Phase transitions during oxygen desorption , 1988 .

[13]  C. Peden,et al.  Kinetics of CO oxidation on single-crystal Pd, Pt, and Ir , 1988 .

[14]  M. Grunze,et al.  Chemical cleaning of metal surfaces in vacuum systems by exposure to reactive gases , 1988 .

[15]  P. Thiel,et al.  Oxygen on Pd(100): Order, reconstruction, and desorption , 1988 .

[16]  D. M. Stupin.  X‐ray gauge measures areal density variations as small as 0.1% , 1985 .

[17]  J. Yates,et al.  Infrared spectroscopic observations of surface bonding in physical adsorption: The physical adsorption of CO on SiO2 surfaces , 1984 .

[18]  C. R. Brundle,et al.  CO oxidation on Pd(100): A study of the coadsorption of oxygen and carbon monoxide , 1984 .

[19]  A. Ortega,et al.  The adsorption of CO on Pd(100) studied by IR reflection absorption spectroscopy , 1982 .

[20]  G. Ertl,et al.  A molecular beam study of the catalytic oxidation of CO on a Pt(111) surface , 1980 .

[21]  P. D. Reed,et al.  Oxygen chemisorption and the carbon monoxide-oxygen interaction on Ru(101) , 1977 .

[22]  T. Madey,et al.  Adsorption of oxygen and oxidation of CO on the ruthenium (001) surface , 1975 .

[23]  J. C. Cook,et al.  Reflection absorption IR studies of vibrational energy transfer processes and adsorption energetics , 1997 .

[24]  Theodore E. Madey,et al.  Vibrational spectroscopy of molecules on surfaces , 1987 .