Fig. 1
Schematic diagram of cationic species detection. The micro catalytic reactor with a reaction chamber (1 mm i.d. × 8 mm) packed with γ-Al2O3 or acidic zeolites (H-Beta or H-ZSM5) was integrated onto the inlet of ion transfer capillary of an Orbitrap XL MS (Thermo) and kept at an appropriate reaction temperature (373–723 K). The injected alcohol was heated, gasified, and passed through the solid-phase catalyst as the inside of MS was maintained in high vacuum. Finally, all of the gas-phase cationic species generated in the catalytic reaction were simultaneously transferred into the MS detector without any perturbation steps. The system pressure was about 100 Pa during the catalytic reaction. No ionization voltage (0 V) was applied to the MS during the whole process
