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Molecules 2018, 23(1), 1; doi:10.3390/molecules23010001

Comparative Study between Direct and Pseudomorphic Transformation of Rice Husk Ash into MFI-Type Zeolite

1
Institute of Chemical Technology, Universität Leipzig, Linnéstr. 3, 04103 Leipzig, Germany
2
Institute of Physics, Martin-Luther-University Halle-Wittenberg, 06120 Halle (Saale), Germany
3
Institute of Chemical Reaction Engineering, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstr. 3, 91058 Erlangen, Germany
4
Institute of Mineralogy, Crystallography and Materials Science, Universität Leipzig, Scharnhorststrasse 20, 04275 Leipzig, Germany
5
Central Metallurgical Research & Development Institute (CMRDI), P.O. Box 87, Helwan 11421, Egypt
*
Author to whom correspondence should be addressed.
Received: 3 November 2017 / Revised: 13 December 2017 / Accepted: 16 December 2017 / Published: 21 December 2017
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Abstract

Pre-shaped mesoporous amorphous rice husk ash (RHA) and MCM-41 derived from RHA as a silica source were transformed into MFI-type zeolites using two different structure-directing agents. Tetrapropylammonium hydroxide (TPAOH) was utilized as an alkali source for silica dissolution and structure control during the direct transformation of RHA into zeolite. A monopropylamine (PA)-containing alkaline solution (NaOH) was used for the pseudomorphic transformation of RHA or MCM-41 into zeolite. The hydrothermal conversion of RHA or MCM-41 into MFI-type zeolites was investigated as a function of reaction time at 175 °C. With PA as template, the crystallization took place inside and on the outer surface of RHA or MCM-41 without losing the original shape of the initial silica sources, while TPAOH led to the formation of conventional MFI-type zeolite crystals due to the complete dissolution of RHA. The final products were characterized by X-ray diffraction, nitrogen adsorption, scanning electron microscopy, and optical emission spectroscopy. View Full-Text
Keywords: hydrothermal treatment; amorphous; rice husk ash; MCM-41; MFI-type zeolite; pseudomorphic transformation hydrothermal treatment; amorphous; rice husk ash; MCM-41; MFI-type zeolite; pseudomorphic transformation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Alyosef, H.A.; Roggendorf, H.; Schneider, D.; Inayat, A.; Welscher, J.; Schwieger, W.; Münster, T.; Kloess, G.; Ibrahim, S.; Enke, D. Comparative Study between Direct and Pseudomorphic Transformation of Rice Husk Ash into MFI-Type Zeolite. Molecules 2018, 23, 1.

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