(605a) Methane Conversion Using Catalytic Melts to Produce Separable Carbon and Hydrogen or Electrical Power
These concepts are also used for a catalyst for the partial combustion of methane, whereby methane and oxygen are converted to carbon, steam, and heat (reaction 1).
CH4 + O2 -> C + 2 H2O DG° = 424 kJ/mol, DH° = 497 kJ/mol (1)
Electrical power can be produced from the heat and steam. A molten salt is used to catalyze the reaction and separate the carbon, and a steam cycle is proposed to co-generate power. Selectivity of 90% at 56% methane conversion in a 12 cm bubble column reactor is reported. The reaction mechanism is investigated by feeding intermediates, altering salt composition, and determining apparent activation energies. A kinetic model will be presented which is used to explain the product distribution when reaction intermediates are fed. Carbon is characterized by Raman, SEM, and EDX which suggest carbon black is formed and several mechanisms of removal are discussed.
1 Upham, D. C. et al. Catalytic molten metals for the direct conversion of methane to hydrogen and separable carbon. Science 358, 917 (2017).