Minerals 2017, 7(3), 34; https://doi.org/10.3390/min7030034
Temperature-Induced Desorption of Methyl tert-Butyl Ether Confined on ZSM-5: An In Situ Synchrotron XRD Powder Diffraction Study
1
Department of Physics and Earth Sciences, University of Ferrara, Via Saragat 1, 44122 Ferrara (FE), Italy
2
Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Via Fossato di Mortara 17, 44121 Ferrara (FE), Italy
3
Research Centre for Non-Conventional Energy–Istituto Eni Donegani Environmental Technologies, Via Felice Maritano, 26, 20097 San Donato Milanese (MI), Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Peng Yuan
Received: 29 December 2016 / Revised: 6 February 2017 / Accepted: 16 February 2017 / Published: 28 February 2017
(This article belongs to the Special Issue New Insights in Stability, Structure and Properties of Porous Materials)
Abstract
The temperature-induced desorption of methyl tert-butyl ether (MTBE) from aqueous solutions onto hydrophobic ZSM-5 was studied by in situ synchrotron powder diffraction and chromatographic techniques. This kind of information is crucial for designing and optimizing the regeneration treatment of such zeolite. The evolution of the structural features monitored by full profile Rietveld refinements revealed that a monoclinic (P21/n) to orthorhombic (Pnma) phase transition occurred at about 100 °C. The MTBE desorption process caused a remarkable change in the unit-cell parameters. Complete MTBE desorption was achieved upon heating at about 250 °C. Rietveld analysis demonstrated that the desorption process occurred without any significant zeolite crystallinity loss, but with slight deformations in the channel apertures. View Full-TextKeywords:
MTBE; ZSM-5; desorption; in situ synchrotron powder diffraction
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Rodeghero, E.; Pasti, L.; Sarti, E.; Cruciani, G.; Bagatin, R.; Martucci, A. Temperature-Induced Desorption of Methyl tert-Butyl Ether Confined on ZSM-5: An In Situ Synchrotron XRD Powder Diffraction Study. Minerals 2017, 7, 34.
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