Carbon Dissolution and Segregation in Pd(110)

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• 作者：Michael Bowker ; Jonathan Counsell ; Kareem El-Abiary ; Lee Gilbert ; Chris Morgan ; Sankaranarayanan Nagarajan ; Chinnakonda S. Gopinath
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：March 25, 2010
• 年：2010
• 卷：114
• 期：11
• 页码：5060-5067
• 全文大小：242K
• 年卷期：v.114,no.11(March 25, 2010)
• ISSN：1932-7455

文摘

The bulk-surface diffusion of carbon in Pd(110) has been investigated using molecular beams to examine the clean-off of carbon with gas-phase oxygen. The dominant product of the reaction above 600 K is CO; CO₂ is only produced at much lower temperatures where the lifetime of adsorbed CO is significant. The segregation from the bulk only occurs at a measurable rate at >750 K, while loss of carbon into the bulk can occur at much lower temperatures. The reaction of carbon at high temperatures shows two regimes: (i) a non steady-state evolution of CO due to the clean-off of surface carbon already present on the surface, followed by (ii) a near steady-state reaction due to the continuous diffusion of carbon to the surface.