HYDROGEN CHEMISORPTION ON PT-80 FE-20(111) STUDIED BY TDS AND UPS

被引：16

作者：

ATLI, A ^{[1
]}

ALNOT, M ^{[1
]}

EHRHARDT, JJ ^{[1
]}

BERTOLINI, JC ^{[1
]}

ABON, M ^{[1
]}

机构：

[1] CNRS, MAURICE LETORT LAB, F-54600 VILLERS LES NANCY, FRANCE

来源：

SURFACE SCIENCE | 1992年 / 269卷

关键词：

D O I：

10.1016/0039-6028(92)91276-H

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Hydrogen adsorption on Pt80Fe20(111) has been investigated mainly by TDS and UPS. It has been compared to hydrogen adsorption on Pt(111) as the composition of the first layer of this alloy is almost pure platinum due to a strong surface segregation. It appears that the valence band of both clean surfaces is different and that the work function is lowered by 0.2 eV on the alloy compared to Pt(111). The work function changes induced by hydrogen adsorption are of the same sign and the same order of magnitude on both surfaces. Finally the activation energy for desorption of hydrogen is lower by about 2 kcal/mol on the alloy. Results are discussed in relation with the catalytic properties of this alloy in hydrogenation reactions.

引用

页码：365 / 371

页数：7

共 28 条

[1] ELECTRON-SPECTROSCOPY, SECONDARY ION EMISSION AND CHEMICAL-REACTIVITY OF ADSORPTION BEHAVIOR OF NITROGEN MONOXIDE AND WATER-VAPOR ON RHENIUM [J].

ALNOT, M ;

WEBER, B ;

EHRHARDT, JJ ;

CASSUTO, A .

APPLIED SURFACE SCIENCE, 1979, 2 (04) :578-613

[2] A CHARACTERIZATION OF HETEROGENEOUS PT SURFACES BY WORK FUNCTION MEASUREMENTS AND PHOTOEMISSION OF ADSORBED XENON [J].

ALNOT, M ;

EHRHARDT, JJ ;

BARNARD, JA .

SURFACE SCIENCE, 1989, 208 (03) :285-305

[3]

[Anonymous], 1962, VACUUM

[4]

BARRETT N, 1992, SURF SCI LETT, V260, P11

[5] MONOTONOUS CONCENTRATION PROFILE AND RECONSTRUCTION AT PT80FE20(111) - LEED STUDY OF A CATALYST [J].

BECCAT, P ;

GAUTHIER, Y ;

BAUDOINGSAVOIS, R ;

BERTOLINI, JC .

SURFACE SCIENCE, 1990, 238 (1-3) :105-118

[6] CROTONALDEHYDE AND METHYLCROTONALDEHYDE HYDROGENATION OVER PT(111) AND PT80FE20(111) SINGLE-CRYSTALS [J].

BECCAT, P ;

BERTOLINI, JC ;

GAUTHIER, Y ;

MASSARDIER, J ;

RUIZ, P .

JOURNAL OF CATALYSIS, 1990, 126 (02) :451-456

[7] ON THE SPECIFIC REACTIVITY OF PLATINUM SEGREGATED LAYERS ON PT80X20 (111) (X = NI, CO, FE) ALLOYS [J].

BERTOLINI, JC ;

MASSARDIER, J .

CATALYSIS LETTERS, 1991, 9 (3-4) :183-188

[8]

BOZSO F, 1977, APPL SURF SCI, V1, P130

[9] ANGLE-RESOLVED PHOTOEMISSION OF XENON ADSORBED ON PT(111) - THE (SQUARE-ROOT-3 X SQUARE-ROOT-3)R30-DEGREES COMMENSURATE LAYER [J].

CASSUTO, A ;

EHRHARDT, JJ ;

COUSTY, J ;

RIWAN, R .

SURFACE SCIENCE, 1988, 194 (03) :579-596

[10]

CHRISTMAN K, 1988, SURF SCI REP, V9, P18

← 1 2 3 →