Time-of-flight studies on catalytic model reactions

被引：3
|
作者：
Winkler, A. [1 ]
Kratzer, M. [1 ]
Pauer, G. [1 ]
Eibl, C. [1 ]
Gleispach, D. [1 ]
机构：
[1] Graz Univ Technol, Inst Solid State Phys, A-8010 Graz, Austria
来源：
TOPICS IN CATALYSIS | 2007年 / 46卷 / 1-2期
关键词：
time-of-flight spectroscopy; REMPI-TOF; palladium; vanadium; hydrogen; deuterium; water; desorption; reaction;
D O I：
10.1007/s11244-007-0329-1
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
Time-of-flight spectroscopy (TOF) and REMPI-TOF (resonance enhanced multi-photon ionization-TOF) were applied to measure the angular and translational energy distribution, as well as the internal state resolved energy distribution of desorption and reaction products on some model systems. Desorption of hydrogen and deuterium from clean and modified Pd(111) surfaces was studied, where the palladium sample was part of a permeation source. Water formation by reaction of oxygen with hydrogen on palladium was investigated by using different types of hydrogen supply: molecular H-2 exposure and atomic H exposure from the gas phase, as well as H exposure by permeating hydrogen. Vanadium oxide nanostructures on Pd(111) were prepared and the influence on D-2 desorption and D2O production was investigated with the permeation technique. Additionally, deuterium desorption from sulfur and oxygen covered V(111) and V(100) surfaces was studied by TOF and REMPI-TOF spectroscopy. From the TOF spectra information concerning the reaction and desorption dynamics (activation barriers) could be gained.
引用
收藏
页码：189 / 199
页数：11
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