Effects of synthesis conditions on structure and surface properties of SmMn2O5 mullite-type oxide

Effects of synthesis conditions on structure and surface properties of SmMn2O5 mullite-type oxide

[Display omitted] •Investigate the effects of calcination temperature and precipitation pH on crystallinity, phase purity, particle size, surface composition, and NO adsorption capacity of SmMn2O5.•High calcination temperature increases mullite phase purity but decreases specific surface area (SSA)....

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Published in:Applied surface science Vol. 385; pp. 490 - 497
Main Authors: Thampy, Sampreetha, Ibarra, Venessa, Lee, Yun-Ju, McCool, Geoffrey, Cho, Kyeongjae, Hsu, Julia W.P.
Format: Journal Article
Language:English
Published: Elsevier B.V 01-11-2016
Subjects:
Calcination
Chemisorption
Coprecipitation
Mullite
NO Chemisorption
Oxides
Samarium
Specific surface area
Surface chemistry
Surface properties
Transition metal oxides
X-ray diffraction
NO Chemisorption
X-ray diffraction
Transition metal oxides
Mullite
Specific surface area
Coprecipitation
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Summary:[Display omitted] •Investigate the effects of calcination temperature and precipitation pH on crystallinity, phase purity, particle size, surface composition, and NO adsorption capacity of SmMn2O5.•High calcination temperature increases mullite phase purity but decreases specific surface area (SSA).•Mullite phase purity is independent of pH while SSA monotonically increases.•SSA and surface Mn/Sm ratio determine NO uptake. A mixed-phase compound that contains SmMn2O5 mullite-type oxides has been reported to display excellent catalytic activity for nitric oxide (NO) oxidation. Here we investigate the effects of calcination temperature and precipitation pH on structural, physical, chemical, and surface properties of SmMn2O5. As the calcination temperature increases from 750°C to 1000°C, mullite phase purity increases from 74% to 100%, while specific surface area (SSA) decreases from 23.6m2/g to 5.1m2/g with particle size increases correspondingly. Mullite phase purity (87%) is independent of pH between 8.5–10.4, whereas SSA monotonically increases from 12.5m2/g at pH 8.1 to 27.4m2/g at pH 13. X-ray photoelectron spectroscopy (XPS) studies reveal that the surface Mn/Sm ratio is similar to the bulk value and is unaffected by calcination temperature and pH values up to 10.4, whereas sample precipitated at pH 13 is surface-rich in Sm. NO chemisorption studies show that the SSA and surface Mn/Sm ratio determine NO uptake by SmMn2O5 mullite oxides.
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ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2016.05.151