Crystallization profile and morphological study of SAPO-5 templated by imidazolium cations of different functional groups
1-Propyl-2,3-dimethyl-1H-imidazole-3-ium (pmIm](+)), 3-(2,3-dihydroxypropyl)-1,2-dimethyl-1H-imidazole-3- ium (dhmIm](+)) and 1-benzyl-2,3-dimethyl-1H-imidazole-3-ium (bzmIm](+)) cations were used as organic templates for crystallizing SAPO-5 with AFI microporous framework. The physico-chemical infl...
محفوظ في:
المؤلفون الرئيسيون: | , , , , , |
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التنسيق: | مقال |
منشور في: |
ELSEVIER
2020
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الموضوعات: | |
الوصول للمادة أونلاين: | http://eprints.um.edu.my/36203/ |
الوسوم: |
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الملخص: | 1-Propyl-2,3-dimethyl-1H-imidazole-3-ium (pmIm](+)), 3-(2,3-dihydroxypropyl)-1,2-dimethyl-1H-imidazole-3- ium (dhmIm](+)) and 1-benzyl-2,3-dimethyl-1H-imidazole-3-ium (bzmIm](+)) cations were used as organic templates for crystallizing SAPO-5 with AFI microporous framework. The physico-chemical influences of the functional groups of the templates (e.g. polarity/hydrophilicity, molecular dimension and size) on SAPO-5 formation were investigated. The results revealed that the crystallization rate, crystallinity and solid yield could be enhanced by increasing the polarity/hydrophilicity of the templates. In addition, the isomorphous Si substitution, morphology and particle size of the resulted SAPO-5 were also affected by the substituted groups of the imidazolium templates. The thermogravimetry results further supported that the selection of organic template with proper polarity/hydrophilicity could be crucial to obtain SAPO-5 with high porosity (S-BET, S-mic, S-ext and V-total) as high polar/hydrophilic template exhibited stronger chemical interaction with the AFI framework during template removal process via calcination process. |
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