NDLI: Synthesis of porous Al pillared montmorillonite after pre-intercalation with dodecylamine: textural and thermal properties

Content Provider	Springer Nature Link
Author	Wang, Guifang Zhang, Shuai Wang, Jing Ma, Shaojian Lu, Xianjun Komarneni, Sridhar
Copyright Year	2016
Abstract	Al pillared montmorillonites (Al-PILM) were synthesized by the reaction of Na$^{+}$-montmorillonite (Na$^{+}$-Mt) and hydroxy-Al cation after pre-intercalation with dodecylamine (DA) under different drying methods and calcination temperatures. The results showed that Al-PILM dried at room temperature was more crystalline and had larger c-axis spacing, d$_{(001)}$, BET specific surface area (S$_{BET}$) and microporous volume, compared to those by common air-blast drying or vacuum drying and the superiority in the above properties of the drying methods is as follows: air drying > air-blast drying > vacuum drying. This suggests that natural air drying at room temperature favored the formation of more ordered pillar formation. It was also found that the pre-intercalation of DA had important influence on the physicochemical properties of Al-PILM. When the amount of pre-intercalated DA was 1/2 CEC of Na$^{+}$-Mt, c-axis spacing, d$_{(001)}$, S$_{BET}$ and microporous volume of Al-PILM were increased and larger than those prepared without pre-intercalation of DA and the former sample had a more regularly ordered pillar distribution due probably to the reduced pillar density in the montmorillonite interlayers. The DA pre-intercalated PILMs were stable at a larger range of temperatures. With the increase of calcination temperature, the interlayer spacing d$_{(001)}$ value decreased, and the S$_{BET}$ and microporous volume increased firstly and then decreased. During calcination, the pre-intercalated DA was removed and the hydroxyl-Al cation was converted into the rigid Al$_{2}$O$_{3}$ pillars, which resulted in decreased pillar size between Mt layers followed by porosity improvement of Al-PILM.
Starting Page	1687
Ending Page	1694
Page Count	8
File Format	PDF
ISSN	13802224
Journal	Journal of Porous Materials
Volume Number	23
Issue Number	6
e-ISSN	15734854
Language	English
Publisher	Springer US
Publisher Date	2016-09-03
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Al-pillared montmorillonite Structure Dodecylamine Drying Catalysis Characterization and Evaluation of Materials Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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