A revolutionary technique for producing syngas is to convert methane utilising the chemical-looping principle. In order to prevent direct contact between fuel and gaseous oxygen, this method is based on the transfer of gaseous oxygen source to fuel (such as methane) through a cycling process employing solid oxides as oxygen carriers. The direct production of syngas through the reaction of oxygen carriers and methane is preferable, but this method requires an oxygen carrier with the capacity to selectively oxidise methane. This vision was initially made true using an oxygen carrier made of CeO2. An important problem for this technique is the design and development of appropriate oxygen carriers with high activity, selectivity, and redox stability for methane selective oxidation.