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Poster Presentations
Day 3, June 24（Tue.）
Room P (Maesato East, Foyer, Ocean Wing)
- 3P-PM-14
Capture the fleeting intermediates during thermal/photo catalytic reactions by photoionization mass spectrometry
(USTC)
oChengyuan Liu, Yang Pan
Heterogeneous catalysis plays a central role in the modern chemical industry, accounting for over 80% of catalytic transformation processes. Among the various types of heterogeneous catalysis, gas-solid two phase catalytic reactions have attracted great attention. The development and designation of advanced catalysts need the understanding of reaction mechanism, which demands more in situ characterization techniques. Great efforts have been paid on the operando characterization of catalysts during reaction. However, the capture of fleeting gas phase intermediates was a big challenge. Here, molecular beam/photoionization mass spectrometry was developed to in situ capture the reactive intermediates during thermal and/or photo catalytic reactions. These unstable intermediates were desorbed from catalyst surface, saved during molecular beam sampling and then detected by photoionization mass spectrometry. In addition, synchrotron radiation light with the advantages of high brightness, good collimation and wavelength tenability was used as the light source. By using this method, we captured a series of intermediates and radicals, such as methyl radicals, carbine radicals, ketene and HCHO in photocatalytic oxidation of methane, methanol-to-hydrocarbons, propane oxidative dehydrogenation, methane dehydroaromatization, which are of great significance for understanding the catalytic reactions and catalyst deactivation.