Heterogeneous catalytic and chemical looping routes to N2 activation: general discussion

Fatima Abi Ghaida, Katharina Brinkert, Yongli Cai, C. Richard A. Catlow, Hsin Yi Tiffany Chen, Ping Chen, Jean Philippe Dacquin, Angela Daisley, Joseph El-Kadi, Wenbo Gao, Jianping Guo, Justin S.J. Hargreaves, Michael D. Higham, Patrick L Holland, Hideo Hosono, Gavin J. Irvine, John T.S. Irvine, Manpreet Kaur, Yoji Kobayashi, Said LaassiriLuc Liedtke, Douglas R. MacFarlane, Josh Makepeace, Ian J. McPherson, Vineet Mishra, Pinkie Ntola, Shiho Otomo, Jonas C. Peters, Yasushi Sekine, Zhangjie Shi, Carsten Sievers, Ifan E.L. Stephens, Tim Sudmeier, Laura Torrente Murciano, Deniz Uner, Qianru Wang, Yaolin Wang, Olivia Westhead, Lukman Yusuf, Xin Zeng

Research output: Contribution to journalComment / DebateOtherpeer-review

Abstract

Justin S. J. Hargreaves opened discussion of the introductory lecture by Hideo Hosono: In the case of conventionally supported ruthenium catalysed ammonia synthesis there is a strong influence of particle size which can be associated with the expression of B5 active sites. In the case of electride supported ruthenium is the nature of any structure sensitivity different?

Hideo Hosono responded: Ru B5 sites exhibit high activity. I think this is also true for the electride support. The role of the electride is promotion of electrons to the N 2 absorbed on the Ru, leading to N2 dissociation. One thing to add: LaRuSi is a layered crystal. Ru atoms form a planar unit, with no B5 site, but this material works well. The turnover frequency (TOF) is 600 times higher than that of pure Ru powder. Density functional theory (DFT) calculations revealed that the dissociation of N2 occurs easily on the exposed Ru plane of LaRuSi. A systematic study provides rm evidence that layered Ru with a negative charge in LnRuSi is a new type of active site that differs signicantly from B5sites.1 I think the active site is not restricted to B5 sites.
Original languageEnglish
Pages (from-to)198-230
Number of pages33
JournalFaraday Discussions
Volume243
DOIs
Publication statusPublished - 26 Jun 2023

Cite this