High Er doping in CeO2 via lanthanide contraction boosts oxygen vacancy formation and ammonia decomposition

🔗 원문 전체 보기 → Royal Society of Chemistry

요약

Phys. Chem. Chem. Phys., 2026, Advance ArticleDOI: 10.1039/D6CP00737F, PaperJi-Zhou Yang, Zheng Li, Jun-Kang Guo, Chong-Qi Chen, Dong Zhang, Chun-Jie Yuan, Jun-Jun Yao, Li-Long Jiang, Shuang-Feng YinExtensive Er incorporation into CeO2 generates abundant oxyg…

본문

High Er doping in CeO2via lanthanide contraction boosts oxygen vacancy formation and ammonia decomposition

* Corresponding authors

a College of Chemistry and Chemical Engineering, State Key Laboratory of Chemo and Biosensing, Advanced Catalytic Engineering Research Center of the Ministry of Education, Hunan University, Changsha, P. R. China
E-mail: [email protected], [email protected]

b National Engineering Research Center of Chemical Fertilizer Catalyst, School of Chemical Engineering, Fuzhou University, Fuzhou, Fujian, P. R. China

c College of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, P.R. China

d College of Chemistry and Chemical Engineering, Central South University of Forestry and Technology, Changsha, P. R. China

Abstract

Efficient and stable catalysts are vital for catalytic ammonia decomposition as a clean hydrogen source. In this study, CeO2 support was modified via high Er doping to exploit the lanthanide contraction effect, enabling a wide range of substitution with Ce-to-Er ratios up to 1 : 0.67 without altering the fluorite structure. Among the prepared catalysts, Ni/CeEr0.44Ox exhibited the highest activity, achieving nearly complete NH3 conversion at 650 °C under a space velocity of 30 000 mL g(cat)−1 h−1, together with excellent long-term stability. Comprehensive characterization revealed that substantial Er incorporation generated abundant oxygen vacancies, strengthened the metal–support interaction, and enhanced the electron density of Ni. These synergistic effects collectively facilitated N–N recombination and desorption, thereby enhancing both activity and durability. This work provides valuable insights into dopant-induced electronic modulation and oxygen vacancy engineering in promoting ammonia decomposition.