Keywords
Catalysis, Materials, Alkane transformation, Energy, Shale gas
Presentation Type
Poster
Research Abstract
Platinum alloy catalysts have a multitude of industrial applications due to their superior selectivity compared to pure platinum catalysts. The two properties believed to be responsible for high alloy selectivity in dehydrogenation are the electronic effect and the geometric effect. Currently, both effects are cited as the predominant effect leading to alloy selectivity. Our research seeks to quantify how the electronic effect of alloying changes the kinetics of hydrogenation, and to relate these changes to the observed olefin selectivity in dehydrogenation by alloys. We measured and compared apparent kinetics of ethylene hydrogenation on platinum and a Pt3V alloy catalyst of the same particle size. X-Ray Absorption Spectroscopy (XAS) was used to characterize the electronic changes that occur upon alloy formation. The similarity in reaction orders and activation energies between platinum and the alloy suggests that the electronic effect influences the kinetics of ethylene hydrogenation. The implications of this result on dehydrogenation selectivity are discussed.
Session Track
Medical Science and Engineering
Recommended Citation
Keoni E. Baty, Stephen Purdy, and Jeffrey Miller,
"Insights into the dehydrogenation selectivity of alloys through hydrogenation kinetics"
(August 2, 2018).
The Summer Undergraduate Research Fellowship (SURF) Symposium.
Paper 6.
https://docs.lib.purdue.edu/surf/2018/Presentations/6
Insights into the dehydrogenation selectivity of alloys through hydrogenation kinetics
Platinum alloy catalysts have a multitude of industrial applications due to their superior selectivity compared to pure platinum catalysts. The two properties believed to be responsible for high alloy selectivity in dehydrogenation are the electronic effect and the geometric effect. Currently, both effects are cited as the predominant effect leading to alloy selectivity. Our research seeks to quantify how the electronic effect of alloying changes the kinetics of hydrogenation, and to relate these changes to the observed olefin selectivity in dehydrogenation by alloys. We measured and compared apparent kinetics of ethylene hydrogenation on platinum and a Pt3V alloy catalyst of the same particle size. X-Ray Absorption Spectroscopy (XAS) was used to characterize the electronic changes that occur upon alloy formation. The similarity in reaction orders and activation energies between platinum and the alloy suggests that the electronic effect influences the kinetics of ethylene hydrogenation. The implications of this result on dehydrogenation selectivity are discussed.