Facilely preparing highly dispersed Ni-based CO2 methanation catalysts via employing the amino-functionalized KCC-1 support

Highly Active and Anticoke Fibrous Silica-Supported Nickel Catalyst for CO2 Methanation

“…This suggested that the dendritic mesoporous channels of the fibrous KCC-1 were conducive to fabricating the catalysts with high loading amounts of Ni owing to its good accessibility, while over the traditional mesoporous silica support like MSN, the partial blockage of pore channels by NiO nanoparticles took place, leading to a sharp reduction in specific surface areas and pore volumes as a high amount of Ni was loaded. However, the opposite behavior was observed in the results of Yin et al; the specific surface area of 20Ni/AF-KCC-1 (351.5 m 2 /g) was higher than that of the pristine AF-KCC-1 (148.7 m 2 /g) . The grafting of amino-functional groups on the KCC-1 surface led to the blockage of micropores in the KCC-1 structure; however, this modification resulted in a finer dispersion of metallic particles, thus inducing more surface area for N 2 adsorption in the physisorption analysis.…”

“…Although the reaction conditions were unfavorable, the CO 2 content was much lower (3 vs 19.5 mol %) and the retention time was one-third (gas hourly space velocity (GHSV) value of 30,000 mL/(g h) compared to 10,000 mL/(g h)) 25Ni/KCC-1 catalyst had a quite high T 50 value, ranking second among the catalyst groups. It can be seen that, compared to Ni-based catalysts carried on other porous silica materials such as MSN and SiO 2 , the catalysts supported on KCC-1, including 5Ni/KCC-1, 20Ni/AF-KCC-1, 20Ni/KCC-1, 20Ni/MSN-CHE-SM, and 10Ni/SiO 2 , exhibited outstanding activity, possessing the lowest T 50 value, in the range of 250–280 °C. The second group of catalysts had slightly higher T 50 values, in the range of 300–325 °C, including the studied 25Ni/KCC-1, 5Ni/KCC-1, 10Ni/KCC-1, 20Ni/SiO 2 , and 40Ni/SiO 2 -AEM and the modified perovskite catalyst La 0.9 Sr 0.1 NiO 3 /DMSN .…”

“…However, the opposite behavior was observed in the results of Yin et al; the specific surface area of 20Ni/AF-KCC-1 (351.5 m 2 /g) was higher than that of the pristine AF-KCC-1 (148.7 m 2 /g). 33 The grafting of amino-functional groups on the KCC-1 surface led to the blockage of micropores in the KCC-1 structure; however, this modification resulted in a finer dispersion of metallic particles, thus inducing more surface area for N 2 adsorption in the physisorption analysis.…”

“…In many studies, fibrous silica KCC-1 was prepared using the microemulsion hydrothermal method, 12,27,31,32 and recently, the Ni/KCC-1 catalyst system was further improved with amino-functionalized KCC-1. 33 The asprepared samples were then calcined at 500 °C for 5 h 31 or 550 °C for 3 h. 12 Nonetheless, the pretreatments of Ni/KCC-1 catalysts in those previous studies were still conducted at quite high temperatures (500−550 °C) and for long durations (3−5 h). 12,28,32 Lately, another type of fibrous silica particle, named CHE-SM, was introduced by Aziz et al, which showed superior catalytic activity.…”

“…The enhanced activity contributed to the fibrous morphology of the KCC-1 material. In many studies, fibrous silica KCC-1 was prepared using the microemulsion hydrothermal method, ,,, and recently, the Ni/KCC-1 catalyst system was further improved with amino-functionalized KCC-1 . The as-prepared samples were then calcined at 500 °C for 5 h or 550 °C for 3 h .…”