Synthesis of stable hollow spheres of Si/Al composite oxide with controlled pore size in the shell wall

Jiang, Yanqiu; Zhao, Jingzhe; Bala, Hari; Xu, Huifang; Tao, Nannan; Ding, Xuefeng; Wang, Zichen

doi:10.1016/j.matlet.2004.02.046

Cited by 13 publications

(3 citation statements)

References 21 publications

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“…Hollow microspheres can be successfully prepared by reactions at the interface between nonmiscible liquids, for example around droplets in emulsions. The technique has been widely used to prepare amorphous hollow microspheres of single and mixed oxides such as SiO 2 − or Al 2 O 3 –SiO 2 by a sol–gel process. The sol gel process can thus be combined with a recrystallization technique such as vapor-phase transport to convert (alumino)silicate shells into crystalline hollow zeolites (Figure ).…”

Section: Synthesis Strategiesmentioning

confidence: 99%

Hollow Zeolite Structures: An Overview of Synthesis Methods

et al. 2016

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SSCI-VIDE+ING+CPG:DFA:ATUInternational audienceHollow capsules with dimensions below 1 mu m have recently attracted much attention due to their potential applications as catalysts as well as biomedical and pharmaceutical vectors for controlled drug delivery. Among them, hollow zeolites are particularly interesting because they possess (0 a crystalline structure, which greatly improves their hydrothermal and chemical stability as compared to amorphous silica analogs and (ii) a microporous network that acts as a shape-selective membrane. Moreover, their properties can be continuously tuned by changing their composition, in particular the framework aluminum content. In this perspective review, we examine the recent progress in the development of synthetic methods for the preparation of hollow zeolite and zeotype structures, from templating routes providing large polycrystalline capsules to controlled dissolution methods leading to nanometer-sized hollow single crystals. The applications of these materials will be illustrated and discussed, namely their main potential as catalytic nanoreactors, these being materials particularly adapted for the encapsulation and the confinement of metal nanoparticles. Critical perspectives on future materials with specific properties are also addressed, particularly those with less common zeolite structures and/or compositions

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Section: Synthesis Strategiesmentioning

confidence: 99%

Hollow Zeolite Structures: An Overview of Synthesis Methods

et al. 2016

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“…A wide range of methods have been presented in the literature, in order to prepare spherical materials, homogeneous hydrolysis, colloidal reactions, as well as the precipitation in the gel form, are the main ones [15][16][17][18][19][20]. Dilsiz et al prepared microspheres of aluminum oxide for the sol-gel process, with a diameter between 500 and 1500 nm [15].…”

Section: Introductionmentioning

confidence: 99%

“…Dilsiz et al prepared microspheres of aluminum oxide for the sol-gel process, with a diameter between 500 and 1500 nm [15]. In other studies, Jiang et al showed an easy route for obtaining mesoporous hollow spheres of silicon and aluminum oxide [16,17].…”

Section: Introductionmentioning

confidence: 99%