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Effect of the introduction of Co and Ce‐doping on NO oxidation over Cr‐based composite oxides
Author(s) -
Cao Yan,
Cai Wei
Publication year - 2016
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.1967
Subject(s) - x ray photoelectron spectroscopy , catalysis , desorption , activation energy , temperature programmed reduction , materials science , doping , thermal desorption spectroscopy , transmission electron microscopy , redox , scanning electron microscope , high resolution transmission electron microscopy , analytical chemistry (journal) , chemistry , nuclear chemistry , chemical engineering , inorganic chemistry , nanotechnology , adsorption , organic chemistry , composite material , optoelectronics , engineering
NO oxidation reaction was studied over a series of Ce–Co–Cr–O catalysts with different Co/Cr and various Ce doped prepared by sol–gel method to evaluate the correlation of their structural with catalytic performance. These catalysts were investigated in detail by means of X‐ray diffraction (XRD), Brunauer–Emmett–Teller surface area analysis (BET), high‐resolution transmission electron microscope (HR‐TEM), X‐ray photoelectron spectroscopy (XPS), H 2 ‐temperature‐programmed reduction (H 2 ‐TPR) and temperature‐programmed desorption (TPD). The results demonstrate that the concentration of Co 3+ is the key factor that influences the activity, and high Ce‐doped amount could well disperse the Co species. Hence Ce(3)–Co(3)–Cr(1) catalyst exhibits the higher activity for NO oxidation among all catalysts. The activation energy ( Ea ) are also calculated, and the results explain that the pre‐exponential factor value is important when Ea are close. © 2016 Curtin University of Technology and John Wiley & Sons, Ltd.