Citation: HUANG Xue-Hui, SHANG Xiao-Hui, NIU Peng-Ju. Surface Modification of SBA-15 and Its Effect on the Structure and Properties of Mesoporous La_0.8Sr_0.2CoO₃[J]. Acta Physico-Chimica Sinica, ;2017, 33(7): 1462-1473. doi: 10.3866/PKU.WHXB201704103 shu

Surface Modification of SBA-15 and Its Effect on the Structure and Properties of Mesoporous La_0.8Sr_0.2CoO₃

School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, P. R. China

Received Date: 22 December 2016
Revised Date: 21 March 2017

Mesoporous SBA-15 with mesopore diameter up to 10.1 nm was prepared by a hydrothermal method, and was further functionalized to obtain different surface properties. Thus-prepared SBA-15 was employed as a template to synthesize rhombohedrally crystallized mesoporous La_0.8Sr_0.2CoO₃ perovskite via a nanocasting method. The surface properties of the SBA-15 were adjusted by treatment with concentrated hydrochloric acid, trimethylchlorosilane (TMCS), and 3-aminopropyltriethoxysilane (APTES). A series of characterization techniques verified that all the synthesized templates possessed ordered two-dimensional hexagonal mesoporous structure, and the surface was successfully modified with methyl and amino groups. The mesoporous perovskite structure was formed in the samples and the surface properties of SBA-15 significantly influenced the structure and properties of La_0.8Sr_0.2CoO₃ perovskite oxides. Wide-angle X-ray diffraction patterns suggested that the modified silica templates were conducive to the formation of pure perovskite frameworks with good crystallinity. The catalysts also possessed mesoporous structure, as confirmed by small-angle XRD patterns, high-resolution transmission electron microscopy images, and nitrogen adsorption analysis. Moreover, the La_0.8Sr_0.2CoO₃ materials synthesized using surface-functionalized templates exhibited relatively higher catalytic activity and stability in CO oxidation. Complete CO conversion could be achieved at 140℃ using the thus-prepared La_0.8Sr_0.2CoO₃ materials, and no significant loss in catalytic activity was observed after 100 h of on-stream reaction experiments. X-ray photoelectron spectroscopy, H₂ temperature-programmed reduction, and O₂ temperature-programmed desorption experiments revealed that the existence of Co⁴⁺, Sr enrichment in the perovskite structure, and high content of adsorbed oxygen species play a critical role in the enhanced catalytic activity of the catalysts. We also proposed the possible reasons for the effect of surface properties of the silica templates on the structure and properties of the La_0.8Sr_0.2CoO₃ nanomaterials.
- SBA-15,
- Surface modification,
- Template,
- Mesoporous La_0.8Sr_0.2CoO₃,
- Low-temperature CO oxidation
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Surface Modification of SBA-15 and Its Effect on the Structure and Properties of Mesoporous La0.8Sr0.2CoO3

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通讯作者: 陈斌, bchen63@163.com

Surface Modification of SBA-15 and Its Effect on the Structure and Properties of Mesoporous La_0.8Sr_0.2CoO₃