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Liu F, Zhang S, Wan L, Hao Y, Li J, Wang H, Li Z, Li Q, Cao C. Attachment of facile synthesized NaCo 2O 4 nanodots to SiO 2 nanoflakes for sodium-rich boosted Pt-dominated ambient HCHO oxidation. JOURNAL OF HAZARDOUS MATERIALS 2023; 458:131969. [PMID: 37399727 DOI: 10.1016/j.jhazmat.2023.131969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 06/27/2023] [Accepted: 06/28/2023] [Indexed: 07/05/2023]
Abstract
Surface alkali metal ions are typically utilized as available promoters for ambient HCHO oxidation. In this study, NaCo2O4 nanodots with two different preferential crystallographic orientations are synthesized by facile attachment to SiO2 nanoflakes with varying degrees of lattice defects. A unique Na-rich environment is established through interlayer Na+ diffusion based on the small size effect. The optimized catalyst Pt/HNaCo2O4/T2 can deal with HCHO below 5 ppm in the static measurement system with a sustained release background and produces approximately 40 ppm of CO2 in 2 h. Combining the experimental analyses with density functional theory (DFT) calculations, the possible catalytic enhancing mechanism is proposed from the support promotion perspective, and the positive synergistic effect of Na-rich, oxygen vacancies and optimized facets for Pt-dominant ambient HCHO oxidation via both kinetic and thermodynamic processes is confirmed.
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Affiliation(s)
- Fang Liu
- School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, PR China.
| | - Shiying Zhang
- Hunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha 410022, PR China.
| | - Long Wan
- College of Materials Science and Engineering, Hunan University, Changsha 410082, PR China
| | - Yunjie Hao
- School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, PR China
| | - Jiao Li
- School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, PR China
| | - Hongqiang Wang
- School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, PR China
| | - Zhongfu Li
- School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, PR China; Shandong Collegial Engineering Research Center of Novel Rare Earth Catalysis Materials (CREC), Zibo 255000 Shandong, PR China
| | - Qiaoling Li
- School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, PR China
| | - Chao Cao
- Hebei Key Laboratory of Boron Nitride Micro and Nano Materials, Hebei University of Technology, Tianjin 300130, PR China
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Liu X, Wang C, Chen Y, Qin Q, Li Y, He H. Formaldehyde oxidation on Pd/USY catalysts at room temperature: The effect of acid pretreatment on supports. J Environ Sci (China) 2023; 125:811-822. [PMID: 36375962 DOI: 10.1016/j.jes.2022.02.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2021] [Revised: 02/13/2022] [Accepted: 02/16/2022] [Indexed: 06/16/2023]
Abstract
The complete catalytic oxidation of formaldehyde (HCHO) to CO2 and H2O at room temperature is a green route for indoor HCHO removal. Zeolite is an excellent carrier material for HCHO oxidation due to its large surface area, intricate pores and high adsorption capacity. However, the zeolite-supported noble metal catalysts have currently shown relatively low activity especially at room temperature. In this work, we present a facile acid treatment strategy for zeolite catalysts to improve the hydroxyl concentration and further enhance their catalytic activity for HCHO oxidation. Activity tests illustrated that HCHO could be completely oxidized to CO2 and H2O at a nearly 100% conversion rate with a weight hourly space velocity (WHSV) of 150,000 mL/(g∙hr) at 25°C, when the support of Pd/USY catalysts was pretreated by hydrochloric acid with a concentration of 0.20 mol/L. The characterization results revealed that the active hydroxyl groups originated from the dealumination in the acid treatment play a key role in the HCHO oxidation reaction. The deduced reaction mechanism suggests that bridging hydroxyl groups may oxidize HCHO to dioxymethylene (DOM) species and terminal hydroxyl groups are responsible for the transformation of DOM groups to formate (HCOO) species.
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Affiliation(s)
- Xiaofeng Liu
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Chinese Academy of Sciences, Institute of Urban Environment, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chunying Wang
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Chinese Academy of Sciences, Institute of Urban Environment, Xiamen 361021, China; Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, Chinese Academy of Sciences, Ningbo Urban Environment Observation and Research Station-NUEORS, Ningbo 315800, China
| | - Yumin Chen
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Chinese Academy of Sciences, Institute of Urban Environment, Xiamen 361021, China; Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Chinese Academy of Sciences, Institute of Urban Environment, Xiamen 361021, China.
| | - Qi Qin
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Chinese Academy of Sciences, Institute of Urban Environment, Xiamen 361021, China
| | - Yaobin Li
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Chinese Academy of Sciences, Institute of Urban Environment, Xiamen 361021, China; Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, Chinese Academy of Sciences, Ningbo Urban Environment Observation and Research Station-NUEORS, Ningbo 315800, China; Xiamen Key Laboratory of Materials for Gaseous Pollutant Control, Chinese Academy of Sciences, Institute of Urban Environment, Xiamen 361021, China.
| | - Hong He
- Center for Excellence in Regional Atmospheric Environment, Key Laboratory of Urban Pollutant Conversion, Chinese Academy of Sciences, Institute of Urban Environment, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China; Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, Chinese Academy of Sciences, Ningbo Urban Environment Observation and Research Station-NUEORS, Ningbo 315800, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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Xiang N, Bai Y, Li Q, Han X, Zheng J, Zhao Q, Hou Y, Huang Z. ZIF-67-derived hierarchical hollow Co3O4@CoMn2O4 nanocages for efficient catalytic oxidation of formaldehyde at low temperature. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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