吸附
介孔材料
沸石
材料科学
化学工程
介孔二氧化硅
复合数
比表面积
微型多孔材料
催化作用
煅烧
分子筛
壳体(结构)
解吸
作者
Haijun Yu,Yingying Lv,Kuoyan Ma,Changguo Wang,Zhaoteng Xue,Yujuan Zhao,Yonghui Deng,Ya Dai,Dongyuan Zhao
标识
DOI:10.1016/j.jcis.2014.04.060
摘要
Abstract 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@SiO2 and nano-zeolite A@SiO2 respectively). 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@SiO2 composites 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).
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