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- Title
Anionic Defects Enhanced Ammonia Synthesis Over Ru Catalyst Supported on Barium Niobate Reduced with CaH<sub>2</sub>.
- Authors
Zhao, Yushi; Huang, Jia; Yuan, Mingwei; Li, Xiaozhong; Wang, Yan; Li, Mengwei; Li, Jinjun; You, Zhixiong
- Abstract
Anionic defects of H− (H∙O) and oxygen vacancies with trapped electrons (V∙O) have been built in the lattice of a hydrothermally derived perovskite (Ba5Nb4O15, BNO) by CaH2 reduction in Ar flow at 600 °C for 12 h. The formed anionic defects in the CaH2-reduced BNO (CaBNO) have been found to improve drastically the ammonia synthesis activity of Ru/CaBNO by donating electrons from both H∙O and/or V∙O to Ru atoms. The stoichiometry of H∙O and V∙O has been determined by TPR and TPO method, respectively. The H∙O defects have been proved to react with N2 under ammonia synthesis conditions via TPD, XPS measurements and isotope (D2) reaction, which provides secondary pathways for ammonia synthesis. Kinetic studies revealed that oxygen vacancies accept spilledover H atoms from Ru particles to alleviate the H2 poisoning effect. Cs-promoter has been demonstrated to accelerate the formation of anionic defects in CaBNO under ammonia synthesis reactions. Anionic defects (V∙O and H∙O) formed in the lattice of Ba5Nb4O15 perovskite via CaH2-reduction drastically promote the ammonia synthesis activity of Cs-Ru/CaBNO catalyst
- Subjects
CATALYST supports; RUTHENIUM catalysts; AMMONIA; BARIUM; STOICHIOMETRY
- Publication
Catalysis Letters, 2024, Vol 154, Issue 4, p1715
- ISSN
1011-372X
- Publication type
Article
- DOI
10.1007/s10562-023-04399-8