O2 in tri-reforming in the temperature range of 700–850 8C.
Among the catalysts tested for tri-reforming, their ability to
enhance the conversion of CO2 follows the order of Ni/
MgO > Ni/MgO/CeZrO > Ni/CeO2 Ni/ZrO2 Ni/
Al2O3 > Ni/CeZrO. The higher CO2 conversion over Ni/MgO
and Ni/MgO/CeZrO in tri-reforming may be related to the
interaction of CO2 with MgOand more interface between Ni and
MgO resulting from the formation of NiO-MgO solid solution.
Results of catalytic performance tests over Ni/MgO/CeZrO
catalysts at 850 8C and 1 atm with different feed compositions
confirm the predicted equilibrium conversions based on the
thermodynamic analysis for tri-reforming ofCH4. Kinetics of trireforming
were also examined [63]. The reaction orders with
respect to partial pressures of CO2 andH2O are different over Ni/
MgO, Ni/MgO/CeZrO, and Ni/Al2O3 catalysts for tri-reforming.
The lowest apparent activation energy for CO2 conversion over
Ni/MgO during the tri-reforming process indicates that CO2 is
relatively easier to activate over Ni/MgO than over Ni/Al2O3
catalyst [65].