Low Temperature CO<sub>2</sub> Reforming with Methane Reaction over CeO<sub>2</sub>-Modified Ni@SiO<sub>2</sub> Catalysts
Fagen Wang, Kaihang Han, Weishu Yu, Long Zhao, Yan Wang, Xiaojun Wang, Hao Yu, Weidong Shi
Abstract
Developing high performance catalysts for the low temperature CO2 reforming with methane (CRM) reaction is a challenge due to the occurrences of metal sintering and carbon deposition. In this study, we synthesized CeO2 modified Ni@SiO2 catalysts with excellent properties of sintering-resistance and low carbon deposition for high performance low temperature CRM. The Ni@SiO2-CeO2 catalysts displayed a size effect from tiny Ni nanoparticles to enhance CRM performance and a confinement effect from silica encapsulation to limit Ni sintering and exhibited oxygen storage capacity from ceria to reduce carbon deposition. Performance and characterization results revealed that the Ni@SiO2-CeO2-W catalyst with smaller ceria size exhibited higher performance and lower carbon deposition than the Ni@SiO2-CeO2–E catalyst with bigger ceria size, because the smaller ceria nanoparticles activated more CO2. This work provided a simple strategy to deposit small sized ceria on the Ni@SiO2 catalyst surface for the performance enhancement of low temperature CRM.