Yuanjie Xu , Rong Chen , Hongqiao Lin , Qian Lv , Bo Liu , Lizhi Wu , Li Tan , Yihu Dai , Xupeng Zong , Yu Tang
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引用次数: 0
Abstract
Catalyst interface determines the activity and stability of partial oxidation of methane (POM) toward syngas under high temperatures crucially. Herein, Ni catalysts supported on CeO2 were prepared under different pretreatment atmospheres to construct an optimal and robust interface. Ni/CeO2 catalyst pretreated in H2 (Ni/CeO2-H2) exhibits the higher activity and the better stability than Ni/CeO2-Ar and Ni/CeO2-air catalysts. The Ni-O-Ce interfacial site in Ni/CeO2-H2 catalyst shows the lower reduction temperature, indicating the enhanced H-spillover effect and enhanced oxidation resistance of Ni under POM conditions. Moreover, the XPS and in situ Raman results show that Ni/CeO2-H2 contains more surface oxygen vacancies for adsorbing and activating oxygen, further contributing to the reaction activity. The in situ DRIFTS results indicate that the CH4 could react with the lattice oxygen to form formate and carbonate, and further decompose to CO and CO2. These findings deepen the fundamental understanding of Ni/CeO2 catalysts for POM reaction.
期刊介绍:
The Journal of Catalysis publishes scholarly articles on both heterogeneous and homogeneous catalysis, covering a wide range of chemical transformations. These include various types of catalysis, such as those mediated by photons, plasmons, and electrons. The focus of the studies is to understand the relationship between catalytic function and the underlying chemical properties of surfaces and metal complexes.
The articles in the journal offer innovative concepts and explore the synthesis and kinetics of inorganic solids and homogeneous complexes. Furthermore, they discuss spectroscopic techniques for characterizing catalysts, investigate the interaction of probes and reacting species with catalysts, and employ theoretical methods.
The research presented in the journal should have direct relevance to the field of catalytic processes, addressing either fundamental aspects or applications of catalysis.