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xiejf

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[交流] 赵东元院士新作:具有核壳结构的介孔/微孔分子筛 已有13人参与

A series of core–shell-structured composite molecular sieves comprising zeolite single crystals (i.e., ZSM-5) as a core and ordered mesoporous silica as a shell were synthesized by means of a surfactant-directed sol–gel process in basic medium by using cetyltrimethylammonium bromide (CTAB) as a template and tetraethylorthosilicate (TEOS) as silica precursor. Through this coating method, uniform mesoporous silica shells closely grow around the anisotropic zeolite single crystals, the shell thickness of which can easily be tuned in the range of 15–100 nm by changing the ratio of TEOS/zeolite. The obtained composite molecular sieves have compact meso-/micropore junctions that form a hierarchical pore structure from ordered mesopore channels (2.4–3.0 nm in diameter) to zeolite micropores (≈0.51 nm). The short-time kinetic diffusion efficiency of benzene molecules within pristine ZSM-5 (≈7.88×10−19 m2 s−1) is almost retainable after covering with 75 nm-thick mesoporous silica shells (≈7.25×10−19 m2 s−1), which reflects the greatly opened junctions between closely connected mesopores (shell) and micropores (core). The core–shell composite shows greatly enhanced adsorption capacity (≈1.35 mmol g−1) for large molecules such as 1,3,5-triisopropylbenzene relative to that of pristine ZSM-5 (≈0.4 mmol g−1) owing to the mesoporous silica shells. When Al species are introduced during the coating process, the core–shell composite molecular sieves demonstrate a graded acidity distribution from weak acidity of mesopores (predominant Lewis acid sites) to accessible strong acidity of zeolite cores (Lewis and Brønsted acid sites). The probe catalytic cracking reaction of n-dodecane shows the superiority of the unique core–shell structure over pristine ZSM-5. Insight into the core–shell composite structure with hierarchical pore and graded acidity distribution show great potential for petroleum catalytic processes.



[ 来自科研家族 材料家族 ][ Last edited by xiejf on 2011-12-22 at 14:07 ]
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麦麦爸爸爱小牛
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linjun_you

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送鲜花一朵
谢谢分享~~~~
2楼2011-12-15 11:27:47
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thx
3楼2011-12-15 12:09:49
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4楼2011-12-15 12:51:51
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5楼2011-12-15 18:34:08
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Q.Tan

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家里产切糕

给个论文全名吧.
至虚极.守静笃
6楼2011-12-16 11:01:53
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benqi2007

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小木虫(金币+0.5):给个红包,谢谢回帖
送鲜花一朵
呵呵,是发在哪里的啊???给个链接啊~~~
7楼2011-12-16 11:48:31
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xiejf

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引用回帖:
7楼: Originally posted by benqi2007 at 2011-12-16 11:48:31:
呵呵,是发在哪里的啊???给个链接啊~~~

发在欧化,最新一期
麦麦爸爸爱小牛
8楼2011-12-17 10:58:09
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xhtangxh

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引用回帖:
8楼: Originally posted by xiejf at 2011-12-17 10:58:09:
发在欧化,最新一期

没看到,倒是Chem.-Euro. J.最近两期有相近工作报道,见帖子:
http://muchong.com/bbs/viewthread.php?tid=3953520&fpage=1
9楼2011-12-18 10:48:37
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wsqhao

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题目    Exploring Meso-/Microporous Composite Molecular Sieves with Core–Shell Structures

Chemistry A  European Journal   2011

DOI: 10.1002/chem.201102505
10楼2011-12-22 13:59:32
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