Shale gas is a highly distributed resource which contains a much higher proportion of natural gas liquids (C2-C4) than traditional reserves. In order to fully exploit these resources as chemical feedstocks, new generations of alkane dehydrogenation catalysts are desired which are amenable to deployment close to a well-head. This will place additional constraints on catalyst performance, including high selectivity at extreme temperatures, increased lifetime between catalyst regenerations and regeneration protocols that could be performed using air as the oxidant. In this work we studied coke formation and its removal during alkane dehydrogenation on Pt-Ga catalysts, since they demonstrate very high selectivity towards propene formation from propane. The location of the carbon species was investigated, since the support may serve as a reservoir for the coke deposits. The particle size was varied to investigate the role of surface facets. The support was found to play a major role in slowing the rate of sintering and for achieving redispersion of Pt. On silica supports, these catalysts show high activity, but irreversible deactivation over time. The same intermetallics on ceria supports show slightly lower activity but are completely regenerable in air at moderate temperatures. This study provides insights to help the design of catalysts for distributed manufacturing of olefins from natural gas liquids derived from shale gas.

Achieving improved lifetimes in platinum-based catalysts used for alkane dehydrogenation

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.