The well-studied methanol to hydrocarbons reaction over a ZSM-5 zeolite catalyst has been used to develop a spectro-kinetic approach to obtain an overall reaction mechanism involving both retained species and gas-phase products. We combined two in situ spectroscopic techniques (ultraviolet–visible and Fourier-transform infrared spectroscopies) with online product analysis to obtain the time- and space time-resolved evolution of the entire reaction media. A ZSM-5 zeolite catalyst was tested in two commercial spectroscopic cells at 400 °C using different space times (different inlet flow rates). Specifically, our work focusses on the effect of the space time (key parameter in any kinetic study) and how to tune other parameters such as partial pressure of methanol to resolve, from the spectroscopic and gas-phase points of view, the mechanisms of reaction and deactivation. Our approach reinforces the previous interpretation of these two combined networks in the selected reaction, thus, proving that the spectro-kinetic approach is a robust methodology to simultaneously build overall reaction and deactivation mechanisms.
Bibliographical noteKAUST Repository Item: Exported on 2022-04-21
Acknowledgements: This work was possible due to the financial support of the Ministry of Economy, Industry, and Competitiveness of the Spanish Government (Project CTQ2016-79646-P, cofounded with ERDF funds), the Basque Government (Project IT748-13, IT912-16), and the King Abdullah University of Science and Technology (KAUST). J.V. is thankful for his fellowship granted by the Ministry of Economy, Industry, and Competitiveness of the Spanish Government (BES-2014-069980). The authors are thankful for the technical and human support provided by IZO-SGI SGIker of UPV/EHU and European funding (ERDF and ESF).
ASJC Scopus subject areas
- Physical and Theoretical Chemistry