論文

査読有り
2015年7月

Adsorption and Desorption of Hydrogen by Gas-Phase Palladium Clusters Revealed by In Situ Thermal Desorption Spectroscopy

JOURNAL OF PHYSICAL CHEMISTRY A
  • Masato Takenouchi
  • ,
  • Satoshi Kudoh
  • ,
  • Ken Miyajima
  • ,
  • Fumitaka Mafune

119
26
開始ページ
6766
終了ページ
6772
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1021/acs.jpca.5b03926
出版者・発行元
AMER CHEMICAL SOC

Adsorption and desorption of hydrogen by gas-phase Pd clusters, Pd-n(+), were investigated by thermal desorption spectroscopy (TDS) experiments and density functional theory (DFT) calculations. The desorption processes were examined by heating the clusters that had adsorbed hydrogen at room temperature. The clusters remaining after heating were monitored by mass spectrometry as a function of temperature up to 1000 K, and the temperature-programmed desorption (TPD) curve was obtained for each Pd-n(+). It was found that hydrogen molecules were released from the clusters into the gas phase with increasing temperature until bare Pd-n(+) was formed. The threshold energy for desorption, estimated from the TPD curve, was compared to the desorption energy calculated by using DFT, indicating that smaller Pd-n(+) clusters (n <= 6) tended to have weakly adsorbed hydrogen molecules, whereas larger Pd-n(+) clusters (n >= 7) had dissociatively adsorbed hydrogen atoms on the surface. Highly likely, the nonmetallic nature of the small Pd clusters prevents hydrogen molecule from adsorbing dissociatively on the surface.

Web of Science ® 被引用回数 : 13

リンク情報
DOI
https://doi.org/10.1021/acs.jpca.5b03926
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000357623600002&DestApp=WOS_CPL