CO Desorption Ability from Pt Enhanced by Al2O3: An in Situ Real-Time Attenuated Total Reflection Infrared Investigation

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• 作者：Gengshen Hu ; Hongsheng Gao ; Christopher T. Williams
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：March 15, 2012
• 年：2012
• 卷：116
• 期：10
• 页码：6247-6250
• 全文大小：290K
• 年卷期：v.116,no.10(March 15, 2012)
• ISSN：1932-7455

文摘

The influence of Al₂O₃ on CO desorption from Pt film was studied by means of in situ real-time attenuated total reflection infrared (ATR-IR) spectroscopy. When CO adsorbs on pure Pt film, the interaction between Pt and CO, especially the linear adsorbed CO, is very strong. Thus, the desorption rate of CO from Pt is very slow. However, the CO desorption rate can be significantly increased when Pt is covered by some amount of Al₂O₃, which may be due to the CO spillover effect from Pt to Al₂O₃. The CO desorption rates from pure Pt film and Pt films covered by Al₂O₃ follow the zero-order reaction kinetics; i.e., the desorption rates are coverage-independent. This study also shows that ATR-IR is a very powerful tool to investigate the gas鈥搒olid interface.