NDLI: Improving the catalytic performance of SAPO-18 for the methanol-to-olefins (MTO) reaction by controlling the Si distribution and crystal size

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Improving the catalytic performance of SAPO-18 for the methanol-to-olefins (MTO) reaction by controlling the Si distribution and crystal size

Content Provider	Royal Society of Chemistry (RSC)
Author	Li, Zhibin Corma, Avelino Martínez-Franco, Raquel Martínez-Triguero, Joaquín Moliner, Manuel
Copyright Year	2016
Abstract	The physico-chemical properties of the small pore SAPO-18 zeotype have been controlled by properly selecting the organic molecules acting as organic structure directing agents (OSDAs). The two organic molecules selected to attempt the synthesis of the SAPO-18 materials were N,N-diisopropylethylamine (DIPEA) and N,N-dimethyl-3,5-dimethylpiperidinium (DMDMP). On the one hand, DIPEA allows small crystal sizes (0.1–0.3 μm) to be attained with limited silicon distributions when the silicon content in the synthesis gel is high (Si/TO2 ∼0.8). On the other hand, the use of DMDMP directs the formation of larger crystallites (0.9–1.0 μm) with excellent silicon distributions, even when the silicon content in the synthesis media is high (Si/TO2 ∼0.8). It is worth noting that this is the first description of the use of DMDMP as OSDA for the synthesis of the SAPO-18 material, revealing not only the excellent directing role of this OSDA in stabilizing the large cavities present in the SAPO-18 structure, but also its role in selectively placing the silicon atoms in isolated framework positions. The synthesized SAPO-18 materials have been characterized by different techniques, such as powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), N2 adsorption, solid state NMR, and ammonia temperature programmed desorption (NH3-TPD). Finally, their catalytic activity has been evaluated for the methanol-to-olefin (MTO) process at different reaction temperatures (350 and 400 °C), revealing that the SAPO-18 catalysts with optimized silicon distributions and crystal sizes show excellent catalytic properties for the MTO reaction. These optimized SAPO-18 materials present improved catalyst lifetimes compared to standard SAPO-34 and SSZ-39 catalysts, even when tested at low reaction temperatures (i.e. 350 °C).
Starting Page	2796
Ending Page	2806
Page Count	11
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	6
Issue Number	8
Journal	Catalysis Science & Technology
DOI	10.1039/c5cy02298c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	X-ray crystallography Ammonia N,N-Diisopropylethylamine OSDA Adsorption Micrometre Nuclear magnetic resonance Scanning electron microscope
Content Type	Text
Resource Type	Article
Subject	Catalysis

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Improving the catalytic performance of SAPO-18 for Methanol-to-Olefins (MTO) by controlling the Si distribution and crystal size

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