锡
化学
氨
催化作用
氨生产
铂金
氢
金属
无机化学
光化学
有机化学
作者
Chengliang Mao,Jiaxian Wang,Yunjie Zou,Yanbiao Shi,Camilo J. Viasus,Joel Y. Y. Loh,Meikun Xia,Shufang Ji,Meiqi Li,Hai Shang,Mireille Ghoussoub,Yang Xu,Jessica Ye,Zhilin Li,Nazir P. Kherani,Lirong Zheng,Yanjiang Liu,Lizhi Zhang,Geoffrey A. Ozin
摘要
Stable metal nitrides (MN) are promising materials to fit the future "green" ammonia-hydrogen nexus. Either through catalysis or chemical looping, the reductive hydrogenation of MN to MN1-x is a necessary step to generate ammonia. However, encumbered by the formation of kinetically stable M-NH1─3 surface species, this reduction step remains challenging under mild conditions. Herein, we discovered that deleterious Ti-NH1─3 accumulation on TiN can be circumvented photochemically with supported single atoms and clusters of platinum (Pt1-Ptn) under N2-H2 conditions. The photochemistry of TiN selectively promoted Ti-NH formation, while Pt1-Ptn effectively transformed any formed Ti-NH into free ammonia. The generated ammonia was found to originate mainly from TiN reduction with a minor contribution from N2 activation. The knowledge accrued from this fundamental study could serve as a springboard for the development of MN materials for more efficient ammonia production to potentially disrupt the century-old fossil-powered Haber-Bosch process.
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