期刊
AICHE JOURNAL
卷 62, 期 12, 页码 4365-4376出版社
WILEY
DOI: 10.1002/aic.15339
关键词
propane dehydrogenation; CeO2-Al2O3; PtGa alloy; oxygen storage capacity; oxygen mobility
资金
- National Science Foundation of China [21222604, 21376169, 21406162, 21525626]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120032110024, 20130032120018]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars (MoE)
- Program of Introducing Talents of Discipline to Universities [B06006]
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 N-2 adsorption-desorption, X-ray diffrtaction, temperature programmed reduction, O-2 volumetric chemisorption, H-2-O-2 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. (c) 2016 American Institute of Chemical Engineers AIChE J, 62: 4365-4376, 2016
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