Effects of Ga doping on Pt/CeO2-Al2O3 catalysts for propane dehydrogenation

This paper describes catalytic consequencesThis paper describes catalytic consequences of Pt/CeO2‐Al2O3 catalysts promoted with Ga species for propane dehydrogenation. A series of PtGa/CeO2‐Al2O3 catalysts were prepared by a sequential impregnation method. The as‐prepared catalysts were characterize...

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Bibliographic Details
Published in:AIChE journal 2016-12, Vol.62 (12), p.4365-4376
Main Authors: Wang, Tuo, Jiang, Feng, Liu, Gang, Zeng, Liang, Zhao, Zhi-jian, Gong, Jinlong
Format: Article
Language:English
Subjects:
Accumulation
Adsorption
Aluminum oxide
Catalysts
Cations
CeO2-Al2O3
Chemisorption
Coke
Cubic lattice
Dehydrogenation
Density
Density functional theory
Deposition
Desorption
Electron microscopy
Functional anatomy
Mathematical analysis
Mobility
Optimization
Oxygen
oxygen mobility
oxygen storage capacity
Propane
propane dehydrogenation
PtGa alloy
Selectivity
Series (mathematics)
Stability
Storage
Storage capacity
Temperature effects
Titration
Transmission electron microscopy
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Summary:This paper describes catalytic consequencesThis paper describes catalytic consequences of Pt/CeO2‐Al2O3 catalysts promoted with Ga species for propane dehydrogenation. A series of PtGa/CeO2‐Al2O3 catalysts were prepared by a sequential impregnation method. The as‐prepared catalysts were characterized employing N2 adsorption‐desorption, X‐ray diffrtaction, temperature programmed reduction, O2 volumetric chemisorption, H2‐O2 titration, and transmission electron microscopy. We have shown that Ga3+ cations are incorporated into the cubic fluorite structure of CeO2, enhancing both lattice oxygen storage capacity and surface oxygen mobility. The enhanced reducibility of CeO2 is indicative of higher capability to eliminate the coke deposition and thus is beneficial to the improvement of catalytic stability. Density functional theory calculations confirm that the addition of Ga is prone to improve propylene desorption and greatly suppress deep dehydrogenation and the following coke formation. The catalytic performance shows a strong dependence on the content of Ga addition. The optimal loading content of Ga is 3 wt %, which results in the maximal propylene selectivity together with the best catalytic stability against coke accumulation. © 2016 American Institute of Chemical Engineers AIChE J, 62: 4365–4376, 2016
ISSN:0001-1541
1547-5905
DOI:10.1002/aic.15339