Sintering resistance and stability are pivotal objectives in the design of dry reforming of methane (DRM) catalysts. This study delves into the impact of cerium (Ce) as a promoter on the catalytic performance of Co–La bimetallic catalysts. A novel CoLa-xCe/MA catalyst was synthesized using alumina as a support via the co-impregnation method. The investigation explores the influence of Ce introduction on the catalytic performance of CoLa bimetallic catalysts and their resistance to carbon deposition. The CoLa bimetallic catalyst augments the number of oxygen vacancies on its surface during the reaction process compared to Co-based monometallic catalysts, leading to enhanced resistance to carbon deposition. Nonetheless, CoLa bimetallic catalysts are prone to active site agglomeration and sintering during the reaction, resulting in diminished catalyst stability. The introduction of Ce effectively alleviates this issue by promoting electron transfer between Ce and Co, facilitated by strong interactions between Ce and Co species. This engenders the creation of more active Co2+ sites, thereby enhancing the activation of CH4 in the DRM reaction. XPS analysis reveals a subtle shift in the La spectrum after the introduction of Ce, indicating favorable interactions between La and Ce for enhanced catalytic performance. Moreover, the addition of Ce as a promoter significantly diminishes the presence of medium and strong basic sites on the catalyst surface, promoting the formation of more moderately basic sites conducive to the DRM reaction. This effectively enhances the catalytic capability to adsorb and activate CO2 as well as mitigate carbon deposition during the DRM reaction process. Display omitted •Ce introduction enhances the catalytic performance of Co–La bimetallic catalysts.•The addition of Ce reduces strong basic sites on the catalyst surface.•Ce mitigates active site agglomeration and sintering, improving catalyst stability.•Ce promotes electron transfer between Ce and Co and improved activation of CH4.•CoLa–5Ce/MA catalyst showed better activity and stability.