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In this study, the conversion of CO into CH 4 was investigated utilizing a series of cobalt loaded on fibrous silica (KCC-1) catalysts (Co loading of 5–30 wt%), that were synthesized via microemulsion and impregnation techniques. FESEM-EDX and N 2 physisorption demonstrated that the KCC-1 possessed a spherical structure with fibrous silica dendrimeric morphology with a superior surface area of 861 m2g-1. A significant decreased in the catalyst surface area was noticed upon the addition of Co, suggesting a possible occurrence of KCC-1 pore blockage. Inversely, the number of basic sites on KCC-1 was enhanced after the incorporation of Co, as observed by pyrrole adsorbed FTIR. At 523 K, bare KCC-1 exhibited a very low activity for CO methanation due to low basicity and the absence of surface active sites. The 20Co/KCC-1 demonstrated the best catalytic performance with 72.7% yield of CH 4 and 6.8% of CO 2. These results were plausibly attributed to the high intrinsic number of basic sites and high dispersion of Co on KCC-1 support. A detailed in-situ FTIR spectroscopy study revealed that both types of associative and dissociative mechanism pathways significantly contributed to the high catalytic methanation activity. In addition to the dissociative mechanism, the linear CO species adsorbed on the Co metal by associative mechanism was also further hydrogenated to obtain the final CH 4 products. Image 1 • Highly dispersed Co on KCC-1 enhanced the catalytic activity of CO methanation. • 20Co/KCC-1 catalyst exhibited the highest activity on CO methanation. • High intrinsic basicity of 20Co/KCC-1 enhanced the activity of CO methanation. • The 20Co/KCC-1 undergoes both types of associative and dissociative mechanism. • Linear CO species on Co metal contributed to high CH 4 products. [ABSTRACT FROM AUTHOR]

• Nickel loaded onto Fibrous Silica Zirconia (FSZr) was utilized for CO 2 methanation. • Ni/FSZr exhibited superior activity with 91% CO 2 conversion achieved at 500 °C. • The catalyst's surface area was found to significantly impact their performance. • Ni/FSZr exhibiting a surface area 28-fold higher than the other catalysts. • Ni/FSZr also have moderate basicity and greater amounts of reduced Ni0. The spherical mesoporous nickel−loaded fibrous silica zirconia (Ni/FSZr) were successfully synthesized utilizing hydrothermal system followed by impregnation technique and catalytically assessed in CO 2 hydrogenation for methane production, a valuable alternative renewable fuel. The Ni/FSZr catalyst, including Ni/SiO 2 -ZrO 2 and Ni/ZrO 2 , were tested in a fixed-bed reactor at 150 to 500 °C while sustaining atmospheric pressure. Results showed that Ni/FSZr outperformed the other catalysts, with 91.32% CO 2 conversion and 91.31% CH 4 yield achieved at 500 °C. The catalyst's surface area was found to significantly impact their performance, with Ni/FSZr exhibiting a surface area 28 times higher than the other catalysts. The Ni/FSZr also have moderate basicity and greater amounts of reduced Ni0 which can enhance CO 2 methanation activity. Importantly, all catalysts exhibited exceptional stability with no deactivation observed, but the thermal stability of Ni/FSZr was superior, indicating that the fibrous morphology may possibly withstand the formation of coke and resist deactivation. These findings suggest that Ni/FSZr is an effective catalyst for efficient CO 2 methanation, which can be beneficial in reducing greenhouse gas emissions and providing a sustainable alternative to traditional fossil fuels. [Display omitted] [ABSTRACT FROM AUTHOR]

Mesoporous silica KCC-1 was successfully synthesized by microemulsion system coupled with microwave-assisted hydrothermal method. Mesoporous silica KCC-1 exhibited spherical morphology surrounded with dendritic fiber with the particle size of 200–400 nm and BET surface area of 773 m 2 /g. Mesoporous silica KCC-1 has significantly higher number of basicity and oxygen vacancy than those of MCM-41 and SiO 2 which directly correlated with the catalytic performance of the catalyst. The activity of mesoporous silica KCC-1 in CO 2 methanation is five-fold higher than MCM-41 with the yield of CH 4 reached 38.9% at 723 K. [ABSTRACT FROM AUTHOR]

Energy demand is rising, and the exhaustion of accessible energy sources is currently the greatest challenge. CO methanation has become a crucial reaction for the substituted natural gas production, necessitating a catalyst. Ceria is amongst the most extensively utilized metal oxides owing to its abundance of oxygen vacancies. Despite substantial study on CO methanation, no paper evaluates the impact of ceria in Ni-based catalysts for CO methanation. Hence, we have provided a bibliographic analysis and recent progress on contribution of ceria in Ni-based catalysts for enhanced catalytic CO methanation. This article shows the findings of an informetric investigation of CO methanation conducted between year 1970 and 2022 by examining data from 156 sources and 585 publications. Information regarding the relationships amongst keywords, countries, and journals, an intercountry co-authorship network analysis, and a conception of the co-occurrence network were supplied. Our review concludes with technical challenges and suggestions for future research. [Display omitted] [ABSTRACT FROM AUTHOR]

[Display omitted] Traditional fossil fuels emissions (mainly CO x , SO x , and NO x) have adverse effects on human health and the atmosphere. As part of the clean use of fossil fuels, substitute natural gas (SNG) appears to be one of the most promising alternatives to coal and petroleum for its high combustion heat and low CO 2 emissions. SNG can be produced using the catalytic methanation of carbon monoxide (CO). Still, the lack of a competitive and robust catalytic system is a significant challenge in CO methanation technology marketing. To emphasize enhanced catalytic CO methanation, this work offers a vital understanding of the extrinsic and intrinsic interactions between catalytic gears (active metals, support materials, and promoters). A contemporary evaluation has been made of the latest developments in CO methanation catalytic systems and the optimum synergistic relationship of active metals, support materials, and promoters. The influence of various active metals, supporting materials, promoters, synthesis methods, and reaction mechanisms studies were specifically compared and clarified to design effective CO methanation catalysts. This study can serve as a critical reference, contributing to the development of well-designed and appropriate catalysts for future applications and favorable dissemination performance in the various academic and industrial sectors. [ABSTRACT FROM AUTHOR]