(206a) Catalytic Methane Pyrolysis in Polyvalent Molten Salt Mixtures
In this talk we will report on the activity of salt mixtures such as MnCl2-KCl, FeCl3-NaCl-KCl, and others. We demonstrate with CH4-D2 exchange experiments that the catalytic transformation pathways on these complex salt surfaces is unique from established routes for either the gas-phase or on solid catalysts. We confirm the formation of polyvalent ions using molar volume (density) measurements as a function of bulk concentration, which reveal an excess molar volume when a polyvalent ion is formed in salt mixtures. More importantly, we confirm their presence at the gas-liquid interface in molten salt bubble column reactors using surface tension measurements. Anionic speciation is carried out using spectroscopy such as Raman, UV-vis, and XPS. Continued work is focused on developing an overall understanding of which molten salt polyatomic ions are active for MP based on their valency (acidity) and surface concentration.
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