pressure of CO2 over CaO is low at low temperature, see Fig. 3. The conversion of CH4 is favored at high temperature, which is also expected. Further, comparing Fig. 5 and Fig. 6 reveals that increased pressure hampers the conversion of CH4. Since reforming of CH4 in- volves a volumetric increase, this is in accordance with Le Chatelier's principle. Reduced conversion of CH4 is undesired and leads to re- duced fuel conversion efficiency and low CO2 capture rate. From Fig. 6 it is also evident that poor CH4 conversion due to increased pressure cannot solely be addressed by increased temperature, since high temperature discourages carbonation of CaO to CaCO3.