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• W4313257082 abstract "Abstract Direct conversion of methane to methanol (MTM) over Cu-zeolites is a so-called “dream reaction” for the chemical industry. There is still a lot that can be done in order to optimize the reaction by e.g. achieving a deeper understanding of the reaction mechanism and the nature of the Cu-sites. In this study, we investigated a solid-state ion exchange method to incorporate Cu I ions into zeolites (MOR, BEA, ZSM-5 and FAU), as a more scalable technique. The solid-state ion exchange led to a Cu/Al ration of about 0.8, however with a heterogeneous distribution of Cu. Regardless, Fourier transform-infrared spectroscopy still revealed that most Brønsted acid sites were exchanged in all four samples. Further, CH 4 -temperature programmed reaction experiments showed that some Cu-sites formed were reactive towards CH 4 , with Cu I -MOR and Cu I -FAU having the largest CH 4 consumption. Ultimately, the Cu I -zeolites were tested in the MTM reaction and proved capable of producing methanol, even without the presence of Brønsted sites. A MOR with lower Cu/Al ratio (0.30) was also tested for comparison, and as this sample obtained a much higher productivity than the Cu I -MOR with high Cu-loading (0.10 vs. 0.03 mol MeOH /mol Cu ), it was demonstrated that some fine-tuning is necessary to obtain the active Cu sites for methane activation." @default.
• W4313257082 created "2023-01-06" @default.
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• W4313257082 date "2022-12-27" @default.
• W4313257082 modified "2023-09-30" @default.
• W4313257082 title "Copper-zeolites Prepared by Solid-state Ion Exchange - Characterization and Evaluation for the Direct Conversion of Methane to Methanol" @default.
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• W4313257082 doi "https://doi.org/10.1007/s11244-022-01763-7" @default.
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