Synthesis of core-shell structured zeolite-A@mesoporous silica composites for butyraldehyde adsorption.
Synthesis of core-shell structured zeolite-A@mesoporous silica composites for butyraldehyde adsorption.
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DOI：
10.1016/j.jcis.2014.04.060
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发表时间：
2014-08
影响因子：
9.9
通讯作者：
Haijun Yu;Yingying Lv;Kuo-yan Ma;Changguo Wang;Zhaoteng Xue;Yujuan Zhao;Yonghui Deng;Ya Dai;Dongyuan Zhao
中科院分区：
文献类型：
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作者：
Haijun Yu;Yingying Lv;Kuo-yan Ma;Changguo Wang;Zhaoteng Xue;Yujuan Zhao;Yonghui Deng;Ya Dai;Dongyuan Zhao
采用简单的溶胶-凝胶法在微米级和纳米级A型分子筛（分别为微米级A@SiO2和纳米级A@SiO2）上制备了介孔硅壳核-壳结构薄层。二氧化硅壳的进一步厚度已经从20 nm调整到50 nm，而沸石A的粒度从纳米变化到微米。硅壳的孔在A型沸石核的晶面上有序排列。典型地，丁醛对这些核-壳复合材料的吸附量被很好地研究，并且被证实几乎是原始沸石A的两倍。有趣的是，与微米沸石A（266 mg/g）相比，含有纳米沸石A核的核-壳复合物吸收最大的丁醛（314 mg/g），即使纳米沸石A@SiO2复合物的中孔壳厚度（20 nm）小于微米沸石A@SiO2的中孔壳厚度（50 nm）。这两个值都显著大于原始沸石A（纳米沸石A; 151 mg/g和微米沸石A; 146 mg/g）。
A simple sol–gel process is followed to construct a thin layer of mesoporous silica shell core–shell structure on micrometer sized and nanometer sized zeolite A (micro-zeolite A@SiO2and nano-zeolite A@SiO2respectively). Further thickness of the silica shells has been tuned from 20 to 50 nm while the zeolite A particle size changes from nanometer to micrometer. Pores of the silica shells arranged orderly on the crystal-faces of zeolite-A cores. Typically, adsorption amount of the butyraldehyde towards these core–shell composite materials is investigated well and is verified to be almost double than that of the pristine zeolite A. Interestingly the nano-zeolite A core containing core–shell composite absorbs maximum butyraldehyde (314 mg/g) compared to the micro-zeolite A (266 mg/g), even if the mesoporous shell thickness of the nano-zeolite A@SiO2composites is less (20 nm) than that of micro-zeolite A@SiO2(50 nm). Both of these values are significantly larger than the pristine zeolite A (nano-zeolite A; 151 mg/g and micro-zeolite A; 146 mg/g).