Facile Synthesis of Mesoporous Alumina with Tunable Morphology using Template Free Method,ChemistrySelect

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Facile Synthesis of Mesoporous Alumina with Tunable Morphology using Template Free Method
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-08-04 , DOI: 10.1002/slct.202002596
Narasimharao Kanna ₁ , Srikanth Dama ₁ , G. Valavarasu ₁

Affiliation

Mesoporous alumina (MA) with interesting morphologies of flower or three‐dimensional hierarchical spheres like nanostructures were synthesized in the absence of any template. Hydrothermal synthesis strategy was applied for synthesis of mesoporous γ‐ alumina with tunable properties like BET surface area, pore volume, pore size and superior acidic property. Over all experiments were conducted systematically using aluminum sulfate hydrolysis, precipitation, growth/nucleation. The formation of flower like structures of γ‐Al₂O₃ were characterized by X‐ray powder diffraction (XRD), N₂physisorption, scanning electron microscope (SEM), Temperature programmed ammonia desorption (TPD) for acidity, Nuclear magnetic resonance (NMR) spectroscopy. In order to study the effect of chelating agents like urea and role of complexing agents, a series of contrast experiments were carried out. The novel synthesis methodology yielded MAs with exceptionally high surface areas, pore volumes, uniform pore size distributions and versatile acidic strengths. This present investigation provided a simple and effective approach for preparing mesoporous alumina and the different kinds of morphologies structures of alumina can be controlled precisely by choosing appropriate complexing agents and optimum quantity of precipitating agents. This approach of 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.

中文翻译：

使用无模板方法可容易地合成形态可调的介孔氧化铝

在没有任何模板的情况下，合成了具有有趣花形或三维分层球体（如纳米结构）形态的中孔氧化铝（MA）。水热合成策略被用于合成具有可调性质的介孔γ-氧化铝，例如BET表面积，孔体积，孔径和优异的酸性。使用硫酸铝水解，沉淀，生长/成核系统地进行了全部实验。像的结构花的形成的γ-Al ₂ ö ₃用X射线粉末衍射（XRD），N ₂物理吸附，扫描电子显微镜（SEM），用于酸度的程序升温氨解吸（TPD），核磁共振（NMR）光谱。为了研究尿素等螯合剂的作用和络合剂的作用，进行了一系列对比实验。新颖的合成方法产生了具有异常高的表面积，孔体积，均匀的孔径分布和多种酸强度的MA。本研究为制备介孔氧化铝提供了一种简单有效的方法，可以通过选择合适的络合剂和最佳沉淀剂量来精确控制氧化铝的各种形态结构。这种工作方式不仅使我们能够研究最终产品的增长机制，

更新日期：2020-08-04

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