Catalysts screening on production of syngas over novel cobalt-based catalysts supported with dolomite: effect of calcination temperature and Co loading

Abstract

Dry reforming of methane (DRM) is an effective strategy for combating global warming as it utilizes two major greenhouse gases, CH₄ and CO₂, to produce syngas with a unity ratio. This syngas is ideal for various chemical processes and the synthesis of liquid fuels. Herein, this study we studied effective of DRM over cobalt (Co) supported on dolomite catalyst using varies Co loadings, ranging from 5 to 25%. Effect of calcination temperature was studied ranging 700–900 °C, and it was strongly proven that DRM efficiency proportional increased with calcination temperature due highest calcination temperature may alter the catalyst structure and affecting the absorption of H₂. Noted, rich Co species (20%) catalyst exhibited the highest conversion rates, exceeding 90% for both CH₄ and CO₂ at 900 °C with high stability, without requiring in situ hydrogen gas reduction. The presence of oxygen vacancies on the surfaces of CaO and MgO supplied oxygen atoms to the Co surface, leading to the removal of deposited carbon species and the release of CO. As a result, the 20Co900/Dol catalyst exhibits remarkable catalytic performance and stability, primarily attributable to the swift formation of a uniform alloy and the synergistic interplay between Co and CaO.