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Thermodynamics of Water–Cationic Species–Framework Guest–Host Interactions within Transition Metal Ion-Exchanged Mordenite Relevant to Selective Anaerobic Oxidation of Methane to Methanol
journal contribution
posted on 2020-06-04, 22:05 authored by Xianghui Zhang, Cody B. Cockreham, Zhiyang Huang, Hui Sun, Chen Yang, Oscar G. Marin-Flores, Baodong Wang, Xiaofeng Guo, Su Ha, Hongwu Xu, Di WuLow-temperature
anaerobic methane conversion to methanol (MTM)
using copper ion-exchanged mordenite (Cu-MOR) as the catalyst and
water as the sole source of oxygen is promising for sustainable utilization
of methane. Integrating in situ calorimetric, spectroscopic,
and structural methodologies, we report a systematic study on energetics
of water–cationic species–framework guest–host
interactions as a function of water loading for several mordenites
relevant to low-temperature MTM. Notably, the near-zero coverage hydration
enthalpy on Cu-MOR is −133.1 ± 6.0 kJ/mol water, which
is related to Cu-MOR regeneration using water as oxidant. The copper
oxo sites are thermally stable up to 915 °C and remain chemically
intact as an oxygen source after complete hydration and dehydration.
This study underscores the importance of manipulating the oxidation
state and coordination chemistry of transition metal guest species
in zeolites by fine-tuning the partial pressure of water as a strategy
for rational design, synthesis, and modification of catalysts.
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Keywords
methane conversionSelective Anaerobic Oxidationcoordination chemistrycopper ion-exchanged mordeniteMethanol Low-temperaturetransition metal guest speciesTransition Metal Ion-Exchanged Mordenitecopper oxo sitesnear-zero coverage hydration enthalpyoxygen sourceMTMoxidation stateCu-MOR regenerationwater loading
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