期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 277, 期 -, 页码 10-16出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2018.10.013
关键词
Ceria; SBA-15; Citric acid addition; Small particles; Redox properties of ceria
类别
资金
- Grant of the President of the Russian Federation [MK 2015.2017.3]
- Tomsk State University competitiveness improvement programme
The influence of porous structure and addition of citric acid on the formation of ceria particles inside the SBA-15 pores is studied using nitrogen adsorption-desorption at -196 degrees C, XRD, UV-visible spectroscopy, TEM and TPR-H-2 methods. The use of pores of SBA-15 as nanoreactors provides the formation of CeO2 nanoparticles with sizes below 6 nm. According to XRD and TEM results, the addition of citric acid during the impregnation allows obtaining the CeO2 particles with sizes about 3 nm, while the agglomerates of large CeO2 particles are formed on the surface of the SBA-15, when citric acid is not added. Small sizes of ceria particles (3 nm) cause an enhanced reducibility (TPR-H-2), high defectiveness of the particles and red shift in the UV-vis adsorption spectra. These properties may improve the catalytic and photocatalytic activity of the CeO2/SBA-15-based catalysts in deep and selective oxidation of organic compounds.
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