Photochemical Acceleration of Ammonia Production by Pt<sub>1</sub>-Pt<i><sub>n</sub></i>-TiN Reduction and N<sub>2</sub> Activation
Chengliang Mao, Jiaxian Wang, Yunjie Zou, Yanbiao Shi, Camilo J. Viasus, Joel Y. Y. Loh, Meikun Xia, Shufang Ji, Meiqi Li, Huan Shang, Mireille Ghoussoub, Yangfan Xu, Jessica Ye, Zhilin Li, Nazir P. Kherani, Lirong Zheng, Yanjiang Liu, Lizhi Zhang, Geoffrey A. Ozin
Abstract
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 MN 1– x is a necessary step to generate ammonia. However, encumbered by the formation of kinetically stable M-NH 1─3 surface species, this reduction step remains challenging under mild conditions. Herein, we discovered that deleterious Ti-NH 1─3 accumulation on TiN can be circumvented photochemically with supported single atoms and clusters of platinum (Pt 1 -Pt n ) under N 2 –H 2 conditions. The photochemistry of TiN selectively promoted Ti-NH formation, while Pt 1 -Pt n 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 N 2 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.