Template-free synthesis of mesoporous gamma-alumina with tunable structural properties

ISL OpenIR > 青海盐湖研究所知识仓储

	Template-free synthesis of mesoporous gamma-alumina with tunable structural properties
	Xu, Naicai 1,2,3; Liu, Zhong1 ; Bian, Shaoju1 ; Dong, Yaping1 ; Li, Wu1
	2016-02-15
发表期刊	CERAMICS INTERNATIONAL
卷号	42 期号:3 页码:4072-4079
关键词	Calcination Al2o3 Gamma-alooh Mesoporous Structure Structural Properties
摘要	Mesoporous 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.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/6291
专题	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
作者单位	1.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
推荐引用方式 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.