The article discusses the potential of utilizing CO2 as a valuable resource for producing fuels and chemicals through its transformation using hydrogen as a catalyst. Various catalytic reduction methods, including thermal catalytic reduction, are highlighted for their efficiency in practical applications. The focus is on the role of Ru/TiO2 catalysts in the hydrogenation of CO2, particularly in producing methane (CH4) or carbon monoxide (CO) with high selectivity. The study delves into the impact of sulfate impurities on the catalytic performance of Ru/TiO2 catalysts, showcasing how these impurities play a key role in determining the selectivity of CO2 hydrogenation. By controlling impurity levels in catalyst synthesis, researchers observed a significant enhancement in CO2 hydrogenation selectivity, offering a fresh perspective on catalyst design. The findings emphasize the importance of meticulously managing impurity levels to achieve optimal catalytic performance. This work contributes to establishing fundamental guidelines for designing efficient catalysts for CO2 hydrogenation, paving the way for leveraging CO2 as a resource for sustainable fuel production.