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Template-free synthesis of mesoporous gamma-alumina with tunable structural properties
Xu, Naicai1,2,3; Liu, Zhong1; Bian, Shaoju1; Dong, Yaping1; Li, Wu1
2016-02-15
Source PublicationCERAMICS INTERNATIONAL
Volume42Issue:3Pages:4072-4079
SubtypeArticle
AbstractMesoporous gamma-Al2O3 (MA) with agglomerated nanoparticles was successfully synthesized by using aluminum sulfate as inorganic Al resource, and hexamethylene tetramine (HMTA) as precipitant without using any surfactants, via a hydrothermal method. All the experimental processes experienced the hydrolysis, precipitation and calcination steps. The structural and morphological properties of uncalcined and calcined samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetry differential thermal gravity (TG-DTG) and N-2 adsorption-desorption. The bulk density of the sample is 0.682 cm(3) g(-1), and the specific surface area is 273.302 m(2) g(-1). The pore diameters (7.1 nm and 9.7 nm) indicate that a typical bimodal mesoporous structure was formed within MA. In order to tune the structural properties of MA, various kinds of inorganic aluminum sources and precipitating agents were employed to carry out contrast experiments, which leaded to regular variations in the specific surface area (200.898-273.302 m(2) g(-1)), pore volume (0.121-1.327 cm(3) g(-1)) and pore size (3.7-35.9 nm). At the same time, the experimental results also demonstrated that the various kinds of Al resources and precipitants had no effects on the crystal structure of MA. However, the morphologies of samples, such as nanoparticles, short fibers, flower-like and block -shaped, can be controlled effectively. The present study provides a simple and effective approach for preparing MA, and the structural properties of MA can be controlled precisely by carefully choosing aluminum sources and precipitants. The approach of this work not only allows us to investigate the growth mechanism of the final product, but also reduces cost and the environmental pollution effectively than other template methods. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
KeywordCalcination Al2o3 Gamma-alooh Mesoporous Structure Structural Properties
WOS HeadingsScience & Technology ; Technology
WOS KeywordFREE SOLVOTHERMAL SYNTHESIS ; HYDROTHERMAL SYNTHESIS ; IMPROVED PRECIPITATION ; BOEHMITE NANOFIBERS ; HOLLOW MICROSPHERES ; FACILE SYNTHESIS ; SURFACE-AREA ; GAMMA-AL2O3 ; PRECURSOR ; CATALYSTS
Indexed BySCI
Language英语
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Ceramics
WOS IDWOS:000369190900042
Citation statistics
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/6291
Collection青海盐湖研究所知识仓储
盐湖资源综合利用工程技术中心
盐湖资源与化学实验室
Affiliation1.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China
2.Qinghai Normal Univ, Dept Chem, Xining 810008, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Xu, Naicai,Liu, Zhong,Bian, Shaoju,et al. Template-free synthesis of mesoporous gamma-alumina with tunable structural properties[J]. CERAMICS INTERNATIONAL,2016,42(3):4072-4079.
APA Xu, Naicai,Liu, Zhong,Bian, Shaoju,Dong, Yaping,&Li, Wu.(2016).Template-free synthesis of mesoporous gamma-alumina with tunable structural properties.CERAMICS INTERNATIONAL,42(3),4072-4079.
MLA Xu, Naicai,et al."Template-free synthesis of mesoporous gamma-alumina with tunable structural properties".CERAMICS INTERNATIONAL 42.3(2016):4072-4079.
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