Title: Facile synthesis of the DD3R zeolite: performance in the adsorptive separation of buta-1,3-diene and but-2-ene isomers
Authors: Gucuyener, Canan
van den Bergh, Johan
Joaristi, Alberto Martinez
Magusin, Pieter
Hensen, Emiel J. M
Gascon, Jorge ×
Kapteijn, Freek #
Issue Date: 2011
Publisher: Royal Society of Chemistry
Series Title: Journal of Materials Chemistry vol:21 issue:45 pages:18386-18397
Abstract: Small pore size and hydrophobic nature of DD3R make this material a unique zeolite with high potential in industrial separation applications. However, the reproducible rapid synthesis of this zeolite is still a problem. In this work, a thorough assessment of different synthetic methods revealed that synthesis reproducibility relies on two main pillars: the use of properly cleaned autoclave liners and the synthesis composition. High quality DD3R crystals are obtained when KOH is used as a cleaning agent, eliminating memory effects, and when KF is used in the synthesis as a mineralizing agent. The effect of fluoride addition is investigated by use of several characterization techniques (13C, 19F and 29Si MAS-NMR and (2D) 29Si–1H correlation spectra), while monitoring the temporal crystallization of DDR. 29Si–1H NMR reveals that template molecules accommodated within the cages are sticking to these 8-ring windows through their amine group. High quality DD3R crystals are applied in the adsorptive separation of buta-1,3-diene and but-2-ene isomers, one of the most energy intensive separations in chemical industry. Mixture separation experiments revealed that the 8-ring apertures of the DD3R cages are only accessible to trans-but-2-ene and buta-1,3-diene, while excluding but-1-ene and cis-but-2-ene molecules, resulting in shape-selective separation in the presence of C4 mixtures.
ISSN: 0959-9428
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Non-KU Leuven Association publications
× corresponding author
# (joint) last author

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