Olefins, such as ethylene and propylene, are undoubtedly among the most important and fastest growing in demand petrochemicals. Although fluid catalytic cracking as well as steam cracking processes are still widely utilized, research efforts aim in new technologies that maximize propylene production while addressing the big gap between supply and demand. Vast availability of low molecular weight alkanes due to the recent shale gas revolution is considered as a game-changing opportunity towards the potential development of ‘on-purpose’ production processes. Among the different approaches, the oxidative dehydrogenation of low molecular weight alkanes using carbon dioxide as oxidant is a quite attractive alternative since it has the potential to i) avoid deep oxidation of alkanes/alkenes, ii) reduce coke formation and iii) favor propane conversion due to participation of hydrogen in the reverse water-gas shift reaction (RWGS). Even though many catalytic materials have been reported for the ODH of propane with CO2 as soft oxidant, severe and rapid deactivation of metal oxide catalysts within a short time is usually observed. In this work, we will discuss a series of doped TiO2 and CeO2 as potential supports that show enhanced stability as well as promising catalytic performance. Various transition metal oxides are also deposited on the surface of these supports to investigate their effect on the overall propylene yield as well as propane conversion. In addition, since water is an unavoidable product from the oxidative dehydrogenation of lower alkanes, its interaction with potential surface metal oxide active species can lead to partial hydrolysis of those species thus affecting their activity. Towards this, we will discuss our approach on utilizing Raman and FTIR spectroscopy coupled with in-line mass spectrometry measurements towards understanding how anchored metal oxide species are affected by water. Finally, results will be presented on the actual rates of reoxidation of the metal oxide species using either O2 or CO2.

Propane oxidative dehydrogenation using CO2 as oxidant over doped and mixed metal oxides: Spectroscopic and kinetic approach

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.