Isomer-Selective Detection of Aromatic Molecules in Temperature-Programmed Desorption for Model Catalysis

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• 作者：Andreas Winbauer ; Sebastian L. Kollmannsberger ; Constantin A. Walenta ; Patrick Schreiber ; Josef Kiermaier ; Martin Tschurl ; Ueli Heiz
• 刊名：Analytical Chemistry
• 出版年：2016
• 出版时间：May 17, 2016
• 年：2016
• 卷：88
• 期：10
• 页码：5392-5397
• 全文大小：391K
• 年卷期：0
• ISSN：1520-6882

文摘

Based on three different molecules dosed on a Pt(111) single crystal the selectivity and sensitivity of REMPI-TPD in UHV is investigated for a potential application in heterogeneous catalysis. It is shown that the two structural isomers ethylbenzene and p-xylene can be discriminated by REMPI in a standard TPD experiment. The latter is not possible for the ionization with electrons in a Q-MS. It is further demonstrated by benzene TPD studies that the sensitivity of the REMPI-TOF-MS is comparable to commercial EI-Q-MS solutions and enables the detection of less than 0.6% molecules of a monolayer.