Is gold actor or spectator in the reaction of small AunPdm+ clusters with O2?
Is gold actor or spectator in the reaction of small AunPdm+ clusters with O2?
复制标题
小型 AunPdm 星团与 O2 的反应中,黄金演员还是观众?
DOI:
10.1140/epjd/e2012-30623-1
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
T. M. Bernhardt
中科院分区:
文献类型:
--
作者:
S. M. Lang;A. Frank;I. Fleischer;T. M. Bernhardt
The reactivity of free binary gold-palladium clusters (AuPd\hbox{}+2, Au2Pd+, Au2Pd\hbox{}+2, and Au2Pd\hbox{}+3) toward molecular oxygen was investigated in an ion trap experiment under multi-collision conditions and compared to the reactivities of bare Au\hbox{}+n and Pd\hbox{}+m (n,m= 2 − 5) clusters. Reaction kinetics measurements revealed that the reaction rate is mainly determined by the number of palladium atoms in the clusters and only weakly influenced by additional gold atoms. The same holds true for the observed reaction product distributions. Most interestingly, the most reactive cluster ions Pd\hbox{}+3, Au2Pd\hbox{}+3, and Pd\hbox{}+5 exhibit a strong preference to form tetroxide products, AunPdmO\hbox{}+4. In addition, employing temperature dependent mass spectrometry, a second adsorption species consisting of several weakly bound oxygen molecules was identified for all investigated palladium containing clusters which is, however, only formed at cryogenic temperatures. All these observations suggest that the gold atoms largely act upon a spectator role in the reaction of the binary clusters. Nevertheless, a rough estimation of the relative O2binding energies via statistical rate theory indicates that the addition of gold to the Pd\hbox{}+n clusters decreases the O2-cluster interaction strength, although the reaction rate stays constant. This effect in the binary clusters may be of importance to a potential activation and dissociation of the adsorbed O2molecules.
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DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
Zhixiong Wu;Shuqin Zhou;Jia;S. Zhang
通讯作者:
S. Zhang
DOI:
--
发表时间:
2006
期刊:
影响因子:
--
作者:
Guo Jian;Yang Ji;Die Dong
通讯作者:
Die Dong
DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
M. L. Campbell;J. Plane
通讯作者:
J. Plane
影响因子:
4.4
作者:
B. A. Wells;A. Chaffee
通讯作者:
A. Chaffee
影响因子:
4
作者:
R. Keller;F. Nöhmayer;P. Spädtke;M
通讯作者:
M