COx-free catalytic decomposition of methane over solution combustion synthesis derived catalyst: Synthesis of hydrogen and carbon nanofibers

The catalyst for decomposition of methane to carbon nanofibers and hydrogen was prepared using the solution combustion technique. Dynamics of change of temperature of solution (gel) during the passing of redox reaction of synthesis of catalyst was found experimentally. Testing of catalyst was carried out in a flow through installation. Catalyst with high content of active component 90Ni-10Al(2)O(3) (wt%) was tested in a reaction of methane decomposition in a temperature range 535 degrees C to 675 degrees C and pressures 1 to 5 atm. The samples of carbon nanofibers were investigated by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction. The optimal parameters of catalytic reaction (550 degrees C, 3 atm) providing the high specific yield of hydrogen (287.7 mol/g) were established. The increase of pressure above 1 atm led to prolonged operation of the catalyst. The negative role of temperature rise on the yield of CNFs was found.

Automated summary

The catalyst for decomposing methane to carbon nanofibers and hydrogen was successfully prepared using the solution combustion technique. The dynamics of temperature change during the redox reaction process of catalyst synthesis was experimentally determined. Testing of the catalyst showed that under optimal conditions of temperature and pressure, high specific yield of hydrogen could be achieved.