NDLI: Development of a post-synthetic method for tuning the Al content of OSDA-free Beta as a catalyst for conversion of methanol to olefins

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Development of a post-synthetic method for tuning the Al content of OSDA-free Beta as a catalyst for conversion of methanol to olefins

Content Provider	Royal Society of Chemistry (RSC)
Author	Bao, Xinhe Xiao, Feng-Shou Yokoi, Toshiyuki Feyen, Mathias Meng, Xiangju Vos, Dirk De Otomo, Ryoichi Müller, Ulrich Yilmaz, Bilge Gies, Hermann Zhang, Weiping
Copyright Year	2016
Abstract	Zeolites synthesized without any organic structure-directing agent (OSDA) have several advantages over conventional zeolites synthesized with OSDAs. Their Al-rich compositions, however, are sometimes not suitable for applications as catalysts. In the present study, post-synthetic modification was performed using an Al-rich Beta zeolite synthesized without any OSDAs (designated as “Beta(OF)”) to obtain high-silica Beta zeolites. We have successfully developed a facile post-synthetic method for tuning the Al content of Beta(OF) with the *BEA-type structure retained by calcination at >750 °C followed by acid treatment. Solid-state 29Si and 27Al MAS NMR analyses revealed that during calcination, framework Al atoms were isomorphously substituted with Si atoms to form high-silica frameworks and concomitant extra-framework Al species. The stability of the obtained frameworks against acid treatment was evaluated in terms of the framework Al content, finding that the framework with the Si/Al ratio higher than 12 is well stabilized enough for acid treatment. Thus, dealuminated Beta(OF) zeolites with high-silica compositions were found to be effective catalysts for the methanol-to-olefin (MTO) reaction; particularly, the Beta zeolite with the Si/Al ratio of 112 maintained the conversion of methanol over 90% with selectivity to C2–C4 olefins over 70% even at 40 hours on stream at WHSV = 3.2 h−1.
Starting Page	713
Ending Page	721
Page Count	9
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	6
Issue Number	3
Journal	Catalysis Science & Technology
DOI	10.1039/c5cy00944h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Acid OSDA Magic angle spinning Calcination Zeolite WHSV Methanol
Content Type	Text
Resource Type	Article
Subject	Catalysis

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Development of a post-synthetic method for tuning the Al content of OSDA-free Beta as a catalyst for conversion of methanol to olefins

Small-pore molecular sieves SAPO-57 and SAPO-59: synthesis, characterization, and catalytic properties in methanol-to-olefins conversion

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Catalytic activity and extra-large pores of germanosilicate UTL zeolite demonstrated with decane test reaction

Selective Production of Light Olefins from Catalytic Cracking of n-Hexane over OSDA-Free Beta Zeolites

*7ai solid-state nmr spectra of ultrastable zeolite y with fast magic-angle spinning and 1hd7ai cross-polarization.

27Al Magic-angle spinning nuclear magnetic resonance spectroscopic study of the conversion of basic dicarboxylate aluminium(III) complexes to alumina and aluminium nitride

Microwave rehydrated Mg–Al-LDH as base catalyst for the acetalization of glycerol

Development of a post-synthetic method for tuning the Al content of OSDA-free Beta as a catalyst for conversion of methanol to olefins

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