Journal
ACS CATALYSIS
Volume 3, Issue 12, Pages 3026-3030Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cs400566y
Keywords
heterogenous catalysis; selectivity; propene dehydrogenation; density functional theory; Pt; Pt3Sn alloy; atomistic thermodynamics
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Funding
- Finnish Cultural Foundation
- Academy of Finland [118532]
- Academy of Finland (AKA) [118532, 118532] Funding Source: Academy of Finland (AKA)
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Propene can be produced via dehydrogenation of propane on Pt-based catalysts; however, the catalysts are plagued by low selectivity toward propene and high coke formation. The selectivity can be improved and the coke formation reduced by alloying Pt with Sn. The alloying is known to weaken the binding of propene, which in part tu explains the improved performance. We conducted density functional theory calculations to study the dehydrogenation of propene on flat and stepped Pt and Pt3Sn surfaces. The steps on Pt dehydrogenate propene readily, whereas, on Pt3Sn, the steps are inert because they are decorated with Sn. Our results indicate that the high selectivity and low coking on the Pt-Sn catalyst can result from a lack of active Pt step sites.
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