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Ran M, Dong Y, Zhang X, Li W, Wang Z, Lin S, Yang Y, Song H, Wu W, Liu S, Zhu Y, Zheng C, Gao X. Unraveling the Mechanistic Origin of High N 2 Selectivity in Ammonia Selective Catalytic Oxidation on CuO-Based Catalyst. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:12249-12259. [PMID: 38935480 DOI: 10.1021/acs.est.4c02656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/29/2024]
Abstract
NH3 emissions from industrial sources and possibly future energy production constitute a threat to human health because of their toxicity and participation in PM2.5 formation. Ammonia selective catalytic oxidation to N2 (NH3-SCO) is a promising route for NH3 emission control, but the mechanistic origin of achieving high N2 selectivity remains elusive. Here we constructed a highly N2-selective CuO/TiO2 catalyst and proposed a CuOx dimer active site based on the observation of a quadratic dependence of NH3-SCO reaction rate on CuOx loading, ac-STEM, and ab initio thermodynamic analysis. Combining this with the identification of a critical N2H4 intermediate by in situ DRIFTS characterization, a comprehensive N2H4-mediated reaction pathway was proposed by DFT calculations. The high N2 selectivity originated from the preference for NH2 coupling to generate N2H4 over NH2 dehydrogenation on the CuOx dimer active site. This work could pave the way for the rational design of efficient NH3-SCO catalysts.
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Affiliation(s)
- Mingchu Ran
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
| | - Yi Dong
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
| | - Xiao Zhang
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
- Zhejiang Baima Lake Laboratory Co., Ltd., Hangzhou 310051, China
- Jiaxing Research Institute, Zhejiang University, Jiaxing 314000, China
| | - Weixian Li
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
| | - Zhi Wang
- Center for Electron Microscopy, Institute for Frontier and Interdisciplinary Sciences, State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology and College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Saisai Lin
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
| | - Yang Yang
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
- Jiaxing Research Institute, Zhejiang University, Jiaxing 314000, China
| | - Hao Song
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
| | - Weihong Wu
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
| | - Shaojun Liu
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
| | - Yihan Zhu
- Center for Electron Microscopy, Institute for Frontier and Interdisciplinary Sciences, State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology and College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China
| | - Chenghang Zheng
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
- Zhejiang Baima Lake Laboratory Co., Ltd., Hangzhou 310051, China
- Jiaxing Research Institute, Zhejiang University, Jiaxing 314000, China
| | - Xiang Gao
- State Key Laboratory of Clean Energy Utilization, State Environmental Protection-Center for Coal-Fired Air Pollution Control, Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
- Zhejiang Baima Lake Laboratory Co., Ltd., Hangzhou 310051, China
- Jiaxing Research Institute, Zhejiang University, Jiaxing 314000, China
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D'Andria M, Krumeich F, Yao Z, Wang FR, Güntner AT. Structure-Function Relationship of Highly Reactive CuO x Clusters on Co 3 O 4 for Selective Formaldehyde Sensing at Low Temperatures. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2308224. [PMID: 38143268 PMCID: PMC10933674 DOI: 10.1002/advs.202308224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 12/08/2023] [Indexed: 12/26/2023]
Abstract
Designing reactive surface clusters at the nanoscale on metal-oxide supports enables selective molecular interactions in low-temperature catalysis and chemical sensing. Yet, finding effective material combinations and identifying the reactive site remains challenging and an obstacle for rational catalyst/sensor design. Here, the low-temperature oxidation of formaldehyde with CuOx clusters on Co3 O4 nanoparticles is demonstrated yielding an excellent sensor for this critical air pollutant. When fabricated by flame-aerosol technology, such CuOx clusters are finely dispersed, while some Cu ions are incorporated into the Co3 O4 lattice enhancing thermal stability. Importantly, infrared spectroscopy of adsorbed CO, near edge X-ray absorption fine structure spectroscopy and temperature-programmed reduction in H2 identified Cu+ and Cu2+ species in these clusters as active sites. Remarkably, the Cu+ surface concentration correlated with the apparent activation energy of formaldehyde oxidation (Spearman's coefficient ρ = 0.89) and sensor response (0.96), rendering it a performance descriptor. At optimal composition, such sensors detected even the lowest formaldehyde levels of 3 parts-per-billion (ppb) at 75°C, superior to state-of-the-art sensors. Also, selectivity to other aldehydes, ketones, alcohols, and inorganic compounds, robustness to humidity and stable performance over 4 weeks are achieved, rendering such sensors promising as gas detectors in health monitoring, air and food quality control.
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Affiliation(s)
- Matteo D'Andria
- Human‐centered Sensing Laboratory, Department of Mechanical and Process Engineering, ETH ZurichZurichCH‐8092Switzerland
| | - Frank Krumeich
- Department of Chemistry and Applied BiosciencesLaboratory of Inorganic Chemistry, ETH ZurichZurichCH‐8093Switzerland
| | - Zhangyi Yao
- Department of Chemical EngineeringUniversity College LondonLondonWC1E 7JEUK
| | - Feng Ryan Wang
- Department of Chemical EngineeringUniversity College LondonLondonWC1E 7JEUK
| | - Andreas T. Güntner
- Human‐centered Sensing Laboratory, Department of Mechanical and Process Engineering, ETH ZurichZurichCH‐8092Switzerland
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