We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Ammonia synthesis using a stable electride as an electron donor and reversible hydrogen store.
- Authors
Kitano, Masaaki; Inoue, Yasunori; Yamazaki, Youhei; Hayashi, Fumitaka; Kanbara, Shinji; Matsuishi, Satoru; Yokoyama, Toshiharu; Kim, Sung-Wng; Hara, Michikazu; Hosono, Hideo
- Abstract
Industrially, the artificial fixation of atmospheric nitrogen to ammonia is carried out using the Haber-Bosch process, but this process requires high temperatures and pressures, and consumes more than 1% of the world's power production. Therefore the search is on for a more environmentally benign process that occurs under milder conditions. Here, we report that a Ru-loaded electride [Ca24Al28O64]4+(e?)4 (Ru/C12A7:e?), which has high electron-donating power and chemical stability, works as an efficient catalyst for ammonia synthesis. Highly efficient ammonia synthesis is achieved with a catalytic activity that is an order of magnitude greater than those of other previously reported Ru-loaded catalysts and with almost half the reaction activation energy. Kinetic analysis with infrared spectroscopy reveals that C12A7:e? markedly enhances N2 dissociation on Ru by the back donation of electrons and that the poisoning of ruthenium surfaces by hydrogen adatoms can be suppressed effectively because of the ability of C12A7:e? to store hydrogen reversibly.
- Subjects
ELECTRON donor-acceptor complexes; AMMONIA synthesis; ATMOSPHERIC nitrogen; INFRARED spectroscopy; NITROGEN fixation; RUTHENIUM; CATALYSIS
- Publication
Nature Chemistry, 2012, Vol 4, Issue 11, p934
- ISSN
1755-4330
- Publication type
Article
- DOI
10.1038/nchem.1476