Journal
ACS OMEGA
Volume 6, Issue 8, Pages 5176-5182Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.0c05059
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Funding
- Core Research for Evolutional Science and Technology of the Japan Science and Technology Agency (JST CREST) [JPMJCR16P3]
- China Scholarship Council (CSC) [201906460114]
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MOR-type zeolites with a Si/Al ratio of up to 13 and crystallite sizes of around 60 nm were successfully synthesized from Al-rich aluminosilicates with additional SiO2 under seed-assisted hydrothermal conditions. The presence of pentacoordinated Al species in the Al-rich aluminosilicates played a decisive role in the OSDA-free synthesis of MOR-type zeolites, while control experiments using other starting reagents failed to yield the desired product.
Mordenite (MOR)-type zeolites with a Si/AI molar ratio of up to 13 with crystallite sizes of ca. 60 nm were successfully synthesized from Al-rich aluminosilicates with a Si/Al ratio of 2 and additional SiO2 under seed-assisted hydrothermal conditions for 6 h or longer without any organic structure-directing agents (OSDAs). In stark contrast, under the same hydrothermal conditions for 6 h, control experiments using starting reagent(s), such as Al-poor aluminosilicate, pure SiO2, tetraethyl orthosilicate, and Al(NO3)(3), all of which are typically employed for zeolite synthesis, failed to yield MOR-type zeolites. The pentacoordinated Al species, which are present in Al-rich aluminosilicates and are more reactive than the tetra- and hexa-coordinated Al species typically found in alumina and Al-poor aluminosilicates, played a decisive role in the OSDA-free synthesis of MOR-type zeolites.
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