TY - JOUR
T1 - The effect of composition and gel treatment conditions on the textural properties, reducibility, and catalytic activity of sol-gel-prepared Fe(III)-Cr(III) bulk mixed oxides
AU - Khaleel, Abbas
AU - Nawaz, Muhammad
N1 - Funding Information:
This work was financially supported by UAEU/ECEER research center , grant No. 31R039 , 2014. The authors thank Dr. Tareq Saeed, College of Health Sciences and Medicine, UAEU, for providing the TEM images.
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2016/1/5
Y1 - 2016/1/5
N2 - Highly porous aerogels and xerogels of Cr(III)-Fe(III) bulk mixed oxides with high surface areas were prepared from their nitrate precursors using propylene oxide as a gelation promoter. Products obtained upon treating the gels under supercritical conditions of the employed solvent were compared with their counterparts obtained from gels treated with supercritical CO2 to remove the solvent. Solvent supercritical conditions resulted in amorphous or weakly crystalline nanopowders, after calcination at 500°C, with significantly higher surface areas and larger pore volumes. Furthermore, the mixed oxides showed enhanced reducibility than their parent single metal oxides which was reflected in an enhanced catalytic activity in the oxidation of benzene. Besides their dependence on the preparative conditions, physicochemical properties and catalytic activity of the composites were significantly dependent on the Fe/Cr ratio.
AB - Highly porous aerogels and xerogels of Cr(III)-Fe(III) bulk mixed oxides with high surface areas were prepared from their nitrate precursors using propylene oxide as a gelation promoter. Products obtained upon treating the gels under supercritical conditions of the employed solvent were compared with their counterparts obtained from gels treated with supercritical CO2 to remove the solvent. Solvent supercritical conditions resulted in amorphous or weakly crystalline nanopowders, after calcination at 500°C, with significantly higher surface areas and larger pore volumes. Furthermore, the mixed oxides showed enhanced reducibility than their parent single metal oxides which was reflected in an enhanced catalytic activity in the oxidation of benzene. Besides their dependence on the preparative conditions, physicochemical properties and catalytic activity of the composites were significantly dependent on the Fe/Cr ratio.
KW - Mesoporous materials
KW - Metal oxides
KW - Nanostructured materials
KW - Oxidation
KW - Sol-gel processes
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U2 - 10.1016/j.colsurfa.2015.10.019
DO - 10.1016/j.colsurfa.2015.10.019
M3 - Article
AN - SCOPUS:84945162255
SN - 0927-7757
VL - 488
SP - 52
EP - 57
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
ER -