Carbon formation and sintering remain the main culprits regarding catalyst deactivation in the dry and bireforming\ud of methane reactions (DRM and BRM, respectively). Nickel based catalysts (10 wt.%) supported on\ud alumina (Al2O3) have shown no exception in this study, but can be improved by the addition of tin and ceria. The\ud effect of two different Sn loadings on this base have been examined for the DRM reaction over 20 h, before\ud selecting the most appropriate Sn/Ni ratio and promoting the alumina base with 20 wt.% of CeO2. This catalyst\ud then underwent activity measurements over a range of temperatures and space velocities, before undergoing\ud experimentation in BRM. It not only showed good levels of conversions for DRM, but exhibited stable conversions\ud towards BRM, reaching an equilibrium H2/CO product ratio in the process. In fact, this work reveals how\ud multicomponent Ni catalysts can be effectively utilised to produce flexible syngas streams from CO2/CH4 mixtures\ud as an efficient route for CO2 utilisation.Peer reviewe

This paper evidences the viability of chemical recycling of CO2 via reverse water-gas shift reaction using advanced heterogeneous catalysts. In particular, we have developed a multicomponent Fe-Cu-Cs/Al2O3 catalyst able to reach high levels of CO2 conversions and complete selectivity to CO at various reaction conditions (temperature and space velocities). In addition, to the excellent activity, the novel-Cs doped catalyst is fairly stable for continuous operation which suggests its viability for deeper studies in the reverse water-gas shift reaction. The catalytic activity and selectivity of this new material have been carefully compared to that of Fe/Al2O3, Fe-Cu/Al2O3 and Fe-Cs/Al2O3 in order to understand each active component’s contribution to the catalyst’s performance. This comparison provides some clues to explain the superiority of the multicomponent Fe-Cu-Cs/Al2O3 catalys

Herein, the production of synthetic natural gas is proposed as an effective route for CO2 conversion. Typical catalysts for this reaction are based on Ni. In this study, we demonstrated that the addition of promoters such as iron and cobalt can greatly benefit the activity of standard Ni methanation catalysts. In particular cobalt seems to be a very efficient promoter. Our Co doped material is an outstanding catalysts for the CO2 methanation leading to high levels of CO2 conversion with selectivities close to 100%. Additionally, this catalyst is able to preserve excellent performance at relatively high space velocity which allows flexibility in the reactor design making easier the development of compact CO2 utilisation units. As an additional advantage, the Co-promoted catalysts is exceptionally stable conserving high levels of CO2 conversion under continuous operations in long terms runs