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- W3203299747 endingPage "12556" @default.
- W3203299747 startingPage "12543" @default.
- W3203299747 abstract "Direct methane conversion to methanol via chemical looping using copper-exchanged zeolites has attracted considerable attention during the last decades and is one of the most-actively studied processes. Despite the significant progress that has been made in the design of active systems and the elucidation of active sites, the effects of zeolite topology and the structure of copper species on the nature of the reaction products are yet unclear. Herein, we show that oxygen-activated copper-exchanged zeolites of different framework types, namely, MOR, MFI, BEA, and FAU, yield different products, as detected by in situ Fourier-transform infrared and nuclear magnetic resonance spectroscopy. Molecular methanol, methoxy species, and dimethyl ether prevail at lower reaction temperatures (<473–523 K), and CuI carbonyls and gaseous carbon oxides were detected above 573 K. Methane coupling to C2 and C3 hydrocarbons was shown for the first time over CuMOR, CuBEA, and CuFAU. The nature and relative fraction of formed products strongly depend on the structure of the copper active sites, which is governed by the topology of the zeolite host. Several pathways of methane transformation over copper-exchanged zeolites are identified, opening opportunities for tuning the properties of the materials to achieve the best performance." @default.
- W3203299747 created "2021-10-11" @default.
- W3203299747 creator A5008597064 @default.
- W3203299747 creator A5010083603 @default.
- W3203299747 creator A5054120563 @default.
- W3203299747 creator A5086705545 @default.
- W3203299747 date "2021-09-28" @default.
- W3203299747 modified "2023-10-14" @default.
- W3203299747 title "Methane Transformation over Copper-Exchanged Zeolites: From Partial Oxidation to C–C Coupling and Formation of Hydrocarbons" @default.
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