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SYNTHESIS OF HIGH SILICA CHA ZEOLITES WITH CONTROLLED Si/Al RATIO

Eilertsen, Einar Andre; Nilsen, Merete Hellner; Wendelbo, Rune; Olsbye, Unni; Lillerud, Karl Petter
Journal article; AcceptedVersion; Peer reviewed
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SYNTHESIS-HIGH-SILICA-article.pdf (128.8Kb)
Year
2008
Permanent link
http://urn.nb.no/URN:NBN:no-25846

CRIStin
341893

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  • Kjemisk institutt [843]
Original version
Studies in Surface Science and Catalysis. 2008, 174, 265-268, DOI: http://dx.doi.org/10.1016/S0167-2991(08)80193-0
Abstract
Zeolites with the CHA topology have been synthesized with Si/Al ratios ranging from 15 to 133. ICP-AES analysis shows that the Si/Al ratio in the material is close to linearly related to the Si/Al ratio in the reaction mixture, while powder XRD shows that the unit cell parameters decrease with increasing Si/Al ratio. The difference between the unit cell parameters for the as-synthesized and the calcined samples show that the structure directing agent sterically hinders the contraction in the c-axis direction for the as-synthesized samples. A relationship between the Si/Al ratio in the material and the a-axis has been established. The particle size of the material also shows a dependency on the Si/Al ratio of the material.
 
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