期刊
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
卷 60, 期 5, 页码 2079-2088出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.0c05386
关键词
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资金
- Core Research for Evolutional Science and Technology of the Japan Science and Technology Agency (JST CREST) [JPMJCR16P3]
- Japan Society for the Promotion of Science (JSPS KAKENHI) [15H04181]
- Grants-in-Aid for Scientific Research [15H04181] Funding Source: KAKEN
The zeolites with an MFI-type framework topology containing both Al and Fe atoms were prepared via a two-step mechanochemically assisted method. Compared to zeolites prepared via the conventional one-pot hydrothermal process using homogeneous reagents, the thus-prepared [Al, Fe]-MFI zeolites exhibited a longer catalyst lifetime in the catalytic conversion of dimethyl ether into light olefins due to better homogeneity of Fe atoms in the zeolite catalyst achieved by the mechanochemically assisted method.
Zeolites with an MFI-type framework topology containing both Al and Fe ([Al, Fe]-MFI) atoms were prepared via a two-step mechanochemically assisted method. In the first step, reactions between SiO2 and either alpha-Fe2O3 or gamma-AlO(OH), induced by mechanical force during planetary ball-milling, produced one of the two types of amorphous composites. A second hydrothermal treatment of a mixture of these composites yielded the [Al, Fe]-MFI zeolites. The thus-prepared [Al, Fe]-MFI zeolites exhibited a longer lifetime in the catalytic conversion of dimethyl ether into light olefins, compared to zeolites prepared via the conventional one-pot hydrothermal process using homogeneous reagents. Extraframework Fe species were absent and Fe atoms were well distributed throughout the MFI zeolite prepared via the two-step process, while the conventionally prepared zeolites contained extraframework Fe species. The better homogeneity of Fe atoms in the zeolite catalyst achieved by the mechanochemically assisted method led to a longer catalyst lifetime.
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