This paper focuses on methane reaction with carbon dioxide to perform the dry reforming reaction in the temperature range 350-450 degrees C. It is well known that CO2 in the atmosphere is the main cause of the greenhouse effect world-wide: several strategies are proposed for its consumption, for example pumping into subsoil (exhaust oil reservoirs) or into sea background. In this work, we propose CO2 consumption via chemical reaction with methane. In particular, the reaction of dry reforming of methane to produce syngas was carried out firstly in a traditional reactor, and subsequently in two different membrane reactors. A porous and a dense Pd-Ag tubular membranes have been used for this purpose. The reactors have been compared in terms of: experimental results regarding methane, carbon dioxide conversions, reaction products selectivities and hydrogen recovery. The experimental results achieved have also been compared with what we found in the specialised literature. (C) 2007 Elsevier B.V. All rights reserved.