CO2 conversion into useful chemicals, like methanol and/or dimethyl ether (DME), is an attractive way to cut down the greenhouse-gas emissions, also accomplishing an effective recycle of carbon dioxide [1], [2], [3], [4] and [5]. Currently, DME is proposed as an alternative clean fuel for diesel engines and household uses, also being a potential hydrogen carrier for fuel cells applications [5], [6] and [7].