Journal
FARADAY DISCUSSIONS
Volume 229, Issue -, Pages 176-196Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9fd00142e
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Funding
- EPSRC [EP/K007467/1] Funding Source: UKRI
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The study found that thermal treatment can partially stabilise the active components of Na-Mn-W/SiO2 catalyst, resulting in higher stability during long duration oxidative coupling of methane reaction experiments.
In this study, we investigate the effect of thermal treatment/calcination on the stability and activity of a Na-Mn-W/SiO2 catalyst for the oxidative coupling of methane. The catalyst performance and characterisation measurements suggest that the W species are directly involved in the catalyst active site responsible for CH4 conversion. Under operating conditions, the active components, present in the form of a Na-W-O-Mn molten state, are highly mobile and volatile. By varying the parameters of the calcination protocol, it was shown that these molten components can be partially stabilised, resulting in a catalyst with lower activity (due to loss of surface area) but higher stability even for long duration OCM reaction experiments.
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