Chemical looping dry reforming of methane (CLDRM) is performed by exposing a Ni/CeO2 to CH4 and CO2 in a cyclic way. The solid acts as oxygen carrier producing syngas (CO + H-2) during exposure to CH4, and is re oxidized during exposure to CO2. Absence of CO2 during syngas production avoids reverse water gas shift reaction and allows high selectivity. Oxygen capacity is restored and residual carbon formed at the surface is removed during exposure to CO2. In view of biogas reforming without prior separation of compounds, CLDRM is tested in presence of CO2 in the CH4 feed. CLDRM performance remains high as long as methane is in excess with respect to CO2. At 800 degrees C, CO2/CH4 ratio up to 0.8 may be used, whereas at 600 degrees C, CO2/CH4 should be kept below 0.4. These results allow considering direct biogas reforming in looping conditions. For shale gas valorization, the reactivity of ethane in CLDR conditions is explored. In all the explored temperature range, ethylene formation is observed. Optimization of conversion and selectivity to syngas from ethane reforming should nevertheless be possible by adapting the amount of solid and reaction conditions to the higher oxygen need for ethane reforming in comparison to that of methane.