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Comparative synthesis and physicochemical characterization of CeO 2 nanopowder via redox reaction, precipitation and sol–gel methods used for total oxidation of toluene
Author(s) -
Abbasi Zahra,
Haghighi Mohammad,
Fatehifar Esmaeil,
Rahemi Nader
Publication year - 2011
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.652
Subject(s) - catalysis , redox , toluene , cerium oxide , bet theory , precipitation , specific surface area , coprecipitation , fourier transform infrared spectroscopy , nanoparticle , mixed oxide , particle size , nuclear chemistry , materials science , sol gel , oxide , chemistry , inorganic chemistry , chemical engineering , nanotechnology , organic chemistry , physics , meteorology , engineering
Nanostructured CeO 2 was successfully prepared using three different methods of redox reaction, precipitation and sol–gel methods. Their catalytic activities were studied toward total catalytic oxidation of toluene. The nanostructured CeO 2 physicochemical properties were assessed by XRD, FESEM, BET, TPR‐H 2 , TPD‐CO 2 and FTIR analyses. The XRD patterns showed that the synthesized catalysts had small crystalite size between 8.7 and 15.8 nm. The FESEM images reflected that the synthesized samples had nanoparticles less than 100 nm. BET analysis revealed that the synthesized CeO 2 had large surface area in the order of redox reaction > precipitation > sol–gel. TPR patterns indicated that nano CeO 2 had high reducibility. TPD‐CO 2 showed the presence of weak and medium basic sites. Among synthesized samples, cerium oxide prepared from redox reaction was the most active in total oxidation of toluene. This feature was due to the smallest particle size, largest BET surface area and high reducibility of the nanocatalyst.The synthesized nano CeO 2 had high activity and stability, which presents it as a suitable catalyst in catalytic applications. © 2011 Curtin University of Technology and John Wiley & Sons, Ltd.