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Effects of Ga doping on Pt/CeO 2 ‐Al 2 O 3 catalysts for propane dehydrogenation
Author(s) -
Wang Tuo,
Jiang Feng,
Liu Gang,
Zeng Liang,
Zhao Zhijian,
Gong Jinlong
Publication year - 2016
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15339
Subject(s) - dehydrogenation , catalysis , chemisorption , propane , desorption , titration , coke , inorganic chemistry , chemistry , adsorption , oxygen , selectivity , chemical engineering , materials science , organic chemistry , engineering
This paper describes catalytic consequencesThis paper describes catalytic consequences of Pt/CeO 2 ‐Al 2 O 3 catalysts promoted with Ga species for propane dehydrogenation. A series of PtGa/CeO 2 ‐Al 2 O 3 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 Ga 3+ cations are incorporated into the cubic fluorite structure of CeO 2 , enhancing both lattice oxygen storage capacity and surface oxygen mobility. The enhanced reducibility of CeO 2 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