RSC Advances
Paper
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Conclusions
A catalytic AgCh complex for conversion of CH4 to its oxygenates
was prepared and fully characterized. The complex contained
Ag(I), which provides the redox properties necessary to undergo
the inorganic nucleophilic reactions involved in the conversion
of CH4 to methanol. The suitability of Ag for this conversion was
demonstrated by comparing AgCh with catalysts prepared using
various metal atoms (Fe & Cu). Efforts to identify the best
oxidant revealed that H2O2 alone led to a higher CH4 conversion
percentage than a combination of O2 and H2O2. This result was
suggested to occur because of the shiing of O utilization
source from H2O2 to O2, which renders rate of reaction. We
determined the best environment to maximize methanol
selectivity in our study of ionic liquids with halide anions as
promoters. We found that a combination of AgCh with
[BMIM]+Clꢀ and H2O2 increased the CH4 conversion 11-fold,
but only over oxidized products were observed. The increased
conversion conrmed the utility of our strategy to establish an
interaction between the catalysts and the promoter. Finally,
a system using a combination of H2O2, O2, AgCh and
[BMIM]+Clꢀ showed the best selectivity for methanol and a 13-
fold improvement in the yield of methanol compared to the
system with H2O2 alone, producing 3166 mmol of methanol. As
an extended work, experiments are ongoing in our laboratory to
establish a cyclic radicle mechanism among the added halide
anions and CH4 in order to invent a new green feasible method
for this oxidation reaction.
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Acknowledgements
This work was supported by the Energy Efficiency & Resources
(No. 20163010092210) of the Korea Institute of Energy Tech-
nology Evaluation and Planning (KETEP) grant funded by the
Korea government Ministry of Trade, Industry & Energy and this
work was supported by Nano-Material Fundamental Technology
Development (2016M3A7B4909370) through National Research
Foundation of Korea (NRF) funded by the Ministry of Science,
ICT and Future Planning.
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