Spatially Separated NO Capture and Hydrogenation for NH ₃ Synthesis from O ₂ -Containing Streams
- 1Institute for Catalysis, Hokkaido University, N-21, W-10, Sapporo, Japan, 001-0021
- 2SEP Key Laboratory of Eco-industry, School of Resources and Civil Engineering
- 3Northeastern University
Abstract
The selective conversion of nitric oxide (NO) in combustion flue gases to ammonia (NH 3 ) is a promising strategy for sustainable nitrogen management. However, this conversion remains challenging in O 2 -containing exhaust gases because coexisting O 2 strongly inhibits catalytic hydrogenation. Here, we developed a tandem NO capture and hydrogenation system for NH 3 production from O 2 -containing streams. Various adsorbents were examined for NO capture in the presence of O 2 , and Li-impregnated β zeolite with 1.2 wt% Li, denoted as Li(1.2)/β, was selected as a representative adsorbent owing to its high NO x adsorption capacity. In situ IR spectroscopy showed that NO x species formed from NO + O 2 on Li(1.2)/β were mainly present as [NO + ][NO 2 ] adducts, which subsequently desorbed as NO 2 upon heating. By coupling the Li(1.2)/β-based temperature-swing adsorption unit, operated between 30 and 200 °C, with a downstream Cu(5)/CeO 2 hydrogenation reactor operated at 450 °C, the tandem system maintained an NH 3 yield of 55–60% during a 7 h cyclic operation. These results demonstrate the feasibility of spatially separated NO capture and downstream NO x hydrogenation for converting NO in O 2 -containing streams into a valuable nitrogen resource.
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BibTeX
@misc{anzai2026spatially,
title = {{Spatially Separated NO Capture and Hydrogenation for NH ₃ Synthesis from O ₂ -Containing Streams}},
author = {Akihiko Anzai and Hsu Sheng Feng and Xiupeng Zhang and Shinta Miyazaki and Masaki Yoshihara and Ninqiang Zhang and Junxian Qin and Chenxi He and Takashi Toyao and Ken-ichi Shimizu},
howpublished = {ChemRxiv},
year = {2026},
month = oct,
doi = {10.26434/chemrxiv.15010762/v1},
url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010762/v1},
note = {CC BY-NC-ND},
}
RIS
TY - UNPB
TI - Spatially Separated NO Capture and Hydrogenation for NH ₃ Synthesis from O ₂ -Containing Streams
AU - Akihiko Anzai
AU - Hsu Sheng Feng
AU - Xiupeng Zhang
AU - Shinta Miyazaki
AU - Masaki Yoshihara
AU - Ninqiang Zhang
AU - Junxian Qin
AU - Chenxi He
AU - Takashi Toyao
AU - Ken-ichi Shimizu
PY - 2026
DA - 2026/10/21
PB - ChemRxiv
DO - 10.26434/chemrxiv.15010762/v1
UR - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010762/v1
AB - The selective conversion of nitric oxide (NO) in combustion flue gases to ammonia (NH 3 ) is a promising strategy for sustainable nitrogen management. However, this conversion remains challenging in O 2 -containing exhaust gases because coexisting O 2 strongly inhibits catalytic hydrogenation. Here, we developed a tandem NO capture and hydrogenation system for NH 3 production from O 2 -containing streams. Various adsorbents were examined for NO capture in the presence of O 2 , and Li-impregnated β zeolite with 1.2 wt% Li, denoted as Li(1.2)/β, was selected as a representative adsorbent owing to its high NO x adsorption capacity. In situ IR spectroscopy showed that NO x species formed from NO + O 2 on Li(1.2)/β were mainly present as [NO + ][NO 2 ] adducts, which subsequently desorbed as NO 2 upon heating. By coupling the Li(1.2)/β-based temperature-swing adsorption unit, operated between 30 and 200 °C, with a downstream Cu(5)/CeO 2 hydrogenation reactor operated at 450 °C, the tandem system maintained an NH 3 yield of 55–60% during a 7 h cyclic operation. These results demonstrate the feasibility of spatially separated NO capture and downstream NO x hydrogenation for converting NO in O 2 -containing streams into a valuable nitrogen resource.
ER -