Rempi-tof Ms Detection Of The Catalytic Reaction Process

In this paper, REMPI-TOFMS is applied to investigate the methane dehydroaromatization reaction, which is the earlier stage work of " the application of combinatorial chemistry in material filed".It is the first time that REMPI-TOFMS is used to detect the methane dehydroaromatization reaction. We successfully linked TOFMS with catalytic reactor. Because REMPI-TOFMS can in real time detect the catalytic product of the methane dehydroaromtization reaction, it is possible for us to observe the formation process of benzene in reaction induction. By TPSR, we proved that there were two benzene peaks in the induction of methane dehydroaromatization over supported Mo catalyst on HZSM-5 zeolite. In order to attribute the first peak, we made the TPSR profile of HZSM-5 zeolite. It is the first time that HZSM-5 zeolite is observed to have some catalytic activity. The result is the same with the first peak over the supported Mo catalyst on HZSM-5 zeolite. We attribute the first peak to the weak and limited catalysis of HZSM-5. According to our experimental result and the other people's report, we attribute the second peak to the catalysis of reduced Mo2C from MoO3. We bring forward a new reaction mechanism of methane dehydroaromatization. From our experiment, we know that REMPI-TOFMS has high selectivity, high sensitivity and high time resolution. So it can be applied to in real time detect most of catalytic reaction process.