NDLI: Insights into the effects of steam on propane dehydrogenation over a Pt/Al<sub>2</sub>O<sub>3</sub> catalyst

Content Provider	Royal Society of Chemistry (RSC)
Author	Chen, De Zhu, Yi-An Shan, Yu-Ling Zhou, Xing-Gui Sui, Zhi-Jun
Copyright Year	2015
Abstract	Catalytic propane dehydrogenation over an alumina supported Pt catalyst in the presence of steam is carried out and it is found that the catalyst activity is increased and the apparent activation energy is lowered due to the presence of steam. Three possible mechanisms, i.e. co-adsorption, Langmuir–Hinshelwood and Eley–Rideal, of changes in energetics and pathways for propane dehydrogenation due to the presence of steam are explored by DFT calculation. The results show that co-adsorption of C3 species with surface oxygenated species would elevate dehydrogenation energy barriers due to repulsive interactions between them. Surface –OH is more active than surface –O in activating the C–H bond in propane and propyl species through either the Langmuir–Hinshelwood or Eley–Rideal mechanism and plays an important role in propane dehydrogenation with steam. The Langmuir–Hinshelwood mechanism is kinetically favorable, in which the activations of the first H in propane by surface −OH are the rate determining steps, but the activation energies are higher than that on a clean Pt(111) surface. The observed enhanced catalyst's activity is ascribed to the lowered coking rates as well as the changes in surface coverage due to the co-adsorption of water and the surface oxygenated species.
Starting Page	3991
Ending Page	4000
Page Count	10
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	5
Issue Number	8
Journal	Catalysis Science & Technology
DOI	10.1039/c5cy00230c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Aluminium oxide Energetics Dehydrogenation Chemical bond Langmuir Reactions on surfaces Eley Hinshelwood Activation energy Propane
Content Type	Text
Resource Type	Article
Subject	Catalysis

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