Guan, Xuze;
Asakura, Hiroyuki;
Han, Rong;
Xu, Siyuan;
Liu, Hao-Xin;
Chen, Lu;
Yao, Zhangyi;
... Wang, Feng Ryan; + view all
(2023)
Cascade NH3 Oxidation and N2O Decomposition via Bifunctional Co and Cu Catalysts.
ACS Catalysis
, 13
(20)
pp. 13816-13827.
10.1021/acscatal.3c02392.
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Abstract
The selective catalytic oxidation of NH3 (NH3-SCO) to N2 is an important reaction for the treatment of diesel engine exhaust. Co3O4 has the highest activity among non-noble metals but suffers from N2O release. Such N2O emissions have recently been regulated due to having a 300× higher greenhouse gas effect than CO2. Here, we design CuO-supported Co3O4 as a cascade catalyst for the selective oxidation of NH3 to N2. The NH3-SCO reaction on CuO-Co3O4 follows a de-N2O pathway. Co3O4 activates gaseous oxygen to form N2O. The high redox property of the CuO-Co3O4 interface promotes the breaking of the N-O bond in N2O to form N2. The addition of CuO-Co3O4 to the Pt-Al2O3 catalyst reduces the full NH3 conversion temperature by 50 K and improves the N2 selectivity by 20%. These findings provide a promising strategy for reducing N2O emissions and will contribute to the rational design and development of non-noble metal catalysts.
| Type: | Article |
|---|---|
| Title: | Cascade NH3 Oxidation and N2O Decomposition via Bifunctional Co and Cu Catalysts |
| Location: | United States |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acscatal.3c02392 |
| Publisher version: | https://doi.org/10.1021/acscatal.3c02392 |
| Language: | English |
| Additional information: | Copyright © 2023 The Authors. Published by American Chemical Society. This publication is licensed under |
| Keywords: | ammonia-selective oxidation, CuO/Co3O4 catalyst, N2O decomposition, metal−support interaction, O2 activation |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10180808 |
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