Single photon ionization time-of-flight mass spectrometry with a windowless RF-discharge lamp for high temporal resolution monitoring of the initial stage of methanol-to-olefins reaction.

摘要: Methanol-to-olefins (MTO) is a very important industrial catalysis technique for the production of light olefins, which great economic value and strategic significance. However, it challenge traditional analytical methods to obtain real-time information product variation during MTO reaction process, vital conversion process research mechanism explanation. In this study, single photon ionization time-of-flight mass spectrometry (SPI-TOFMS) based on windowless RF-discharge (WLRF) lamp was developed measurement catalytic initial stage reaction. The vacuum ultraviolet (VUV) energy easily adjusted by changing discharge gas. Argon (Ar) gas eventually adopted as gas, since produces photons with appropriate 11.6 eV 11.8 olefin molecules. detection sensitivities ethylene propylene were largely improved substantially similar level limits (LODs) down 16.98 9.64 ppbv, respectively. monitored high temporal resolution 0.5 s, revealing that first followed propylene. successful application WLRF-SPI-TOFMS in monitoring indicated broad prospects instrument monitoring.