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Komaty S, Andijani M, Wang N, Navarro de Miguel JC, Kumar Veeranmaril S, Hedhili MN, Silva CIQ, Wang Y, Abou-Daher M, Han Y, Ruiz-Martinez J. Enhancing Water Tolerance and N 2 Selectivity in NH 3-SCR Catalysts by Protecting Mn Oxide Nanoparticles in a Silicalite-1 Layer. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024. [PMID: 39083593 DOI: 10.1021/acs.est.4c01585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/02/2024]
Abstract
Mn-based catalysts are promising candidates for eliminating harmful nitrogen oxides (NOx) via selective catalytic reduction with ammonia (NH3-SCR) due to their inherent strong redox abilities. However, poor water tolerance and low N2 selectivity are still the main limitations for practical applications. Herein, we succeeded in preparing an active catalyst for NH3-SCR with improved water tolerance and N2 selectivity based on protecting MnOx with a secondary growth of a hydrophobic silicalite-1. This protection suppressed catalyst deactivation by water adsorption. Interestingly, impregnating MnOx on MesoTS-1 followed by silicalite-1 protection allowed for a higher dispersion of MnOx species, thus increasing the concentration of acid sites. Consequently, the level of N2O formation is decreased. These improvements resulted in a broader operating temperature of NOx conversion and a modification of the NH3-SCR mechanism. Diffuse reflectance infrared Fourier transform spectroscopy analysis revealed that unprotected Mn/MesoTS-1 mainly followed the Eley-Rideal mechanism, while Mn/MesoTS-1@S1 followed both Langmuir-Hinshelwood and Eley-Rideal mechanisms.
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Affiliation(s)
- Sarah Komaty
- Physical Sciences and Engineering Division (PSE), KAUST Catalysis Center (KCC), Catalysis Nanomaterials and Spectroscopy (CNS), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
| | - Marram Andijani
- Physical Sciences and Engineering Division (PSE), KAUST Catalysis Center (KCC), Catalysis Nanomaterials and Spectroscopy (CNS), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
| | - Ning Wang
- Physical Sciences and Engineering Division (PSE), Advanced Membranes and Porous Materials Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Juan Carlos Navarro de Miguel
- Physical Sciences and Engineering Division (PSE), KAUST Catalysis Center (KCC), Catalysis Nanomaterials and Spectroscopy (CNS), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
| | - Sudheesh Kumar Veeranmaril
- Physical Sciences and Engineering Division (PSE), KAUST Catalysis Center (KCC), Catalysis Nanomaterials and Spectroscopy (CNS), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
| | - Mohamed Nejib Hedhili
- Core Laboratories, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Cristina I Q Silva
- Physical Sciences and Engineering Division (PSE), KAUST Catalysis Center (KCC), Catalysis Nanomaterials and Spectroscopy (CNS), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
| | - Yan Wang
- Physical Sciences and Engineering Division (PSE), KAUST Catalysis Center (KCC), Catalysis Nanomaterials and Spectroscopy (CNS), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
| | - Mohamad Abou-Daher
- Physical Sciences and Engineering Division (PSE), KAUST Catalysis Center (KCC), Catalysis Nanomaterials and Spectroscopy (CNS), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
| | - Yu Han
- Physical Sciences and Engineering Division (PSE), Advanced Membranes and Porous Materials Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
| | - Javier Ruiz-Martinez
- Physical Sciences and Engineering Division (PSE), KAUST Catalysis Center (KCC), Catalysis Nanomaterials and Spectroscopy (CNS), King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
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Hu Y, Jiang Z, Liu X, Wang H. Remove elemental mercury from simulated flue gas by CeO 2-modified MnO x/HZSM-5 adsorbent. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:11276-11284. [PMID: 38217812 DOI: 10.1007/s11356-024-31881-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Accepted: 01/02/2024] [Indexed: 01/15/2024]
Abstract
In this study, we synthesized a Ce-modified Mn/HZSM-5 adsorbent via the ultrasound-assisted impregnation for Hg0 capture. Given the addition of 15% CeO2, ~ 100% Hg0 efficiency was reached at 200 °C, suggesting its promotional effect on Hg0 removal. The doped Ce introduced additional chemisorbed oxygen species onto the adsorbent surfaces, which facilitated the oxidation of Hg0 to HgO. Even though adding CeO2 led to a weakened adsorbent acidity, yet it appeared that this negative affect could be completely overcome by the enhanced oxidative ability, which finally endowed Ce-modified Mn/HZSM-5 with a satisfactory Hg0 removal performance within the whole investigated temperature range. During the Hg0 capture process, chemisorption was predominant with Mn4+operating as the main active site for oxidizing Hg0 to Hg2+. Finally, the 15Ce-Mn/HZSM-5 adsorbent exhibited good recyclability and stability. However, its tolerance to H2O and SO2 appeared relatively weak, suggesting that some modification should be conducted to improve its practicality.
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Affiliation(s)
- Yongjin Hu
- College of Quality & Safety Engineering, China Jiliang University, Hangzhou, 310018, China
| | - Zhichang Jiang
- College of Quality & Safety Engineering, China Jiliang University, Hangzhou, 310018, China
| | - Xin Liu
- College of Quality & Safety Engineering, China Jiliang University, Hangzhou, 310018, China
| | - Haining Wang
- College of Quality & Safety Engineering, China Jiliang University, Hangzhou, 310018, China.
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Wei N, Zhao C, Hu X, Tong Z, Yun J, Jiang X, Liu C, Wang K, Zou Y, Chen Z. Elucidating the facet-dependent reactivity of CrMn catalyst for selective catalytic reduction of NO x with NH 3. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 855:158881. [PMID: 36411606 DOI: 10.1016/j.scitotenv.2022.158881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Revised: 09/15/2022] [Accepted: 09/16/2022] [Indexed: 06/16/2023]
Abstract
The facet-dependent reactivity of CrMn catalysts was still unclear, hindering the further enhancement of their low-temperature SCR performance. Herein, the facet-dependent reactivity of CrMn1.5O4 catalyst for NH3-SCR of NOx was innovatively illustrated by numerous characterizations and density functional theory (DFT) calculations. Exposed (100) facet of CrMn1.5O4 catalyst exhibited best low-temperature SCR activity with ≥90 % NO conversion within 148-296 °C and 2.86 × 10-3 mol/(g·s) reaction rate within 160-240 °C. The characterizations revealed that (100) facet could induce the increase of BET specific area, electron transfer, concentration of Mn4+ and Oα, surface acidity, redox ability, NH3 and NOx adsorption/activation capacity. Subsequently, DFT calculations demonstrated that (100) facet exhibited the strongest affinity for NH3 and NO due to its unique 3O3c-Mn5c-2O4c bond and abundant charges transfer near the active adsorption sites, and Brønsted acid and oxygen vacancies were most easily formed on (100) facet. Furthermore, H2O formation as the rate determining step easily occurred on (100) facet. Eventually, we successfully improved the low-temperature SCR activity of CrMn1.5O4 catalyst by further tailoring highly active (100) facet from 0.754 to 0.865. This work provides the deeper understanding of facet-dependent reactivity and a good strategy to improve the catalytic activity of the catalysts.
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Affiliation(s)
- Ninghan Wei
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Cheng Zhao
- Guangdong Key Lab of Water & Air Pollution Control, Guangdong Province Engineering Laboratory for Air Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, PR China
| | - Xiaomei Hu
- Guangdong Key Lab of Water & Air Pollution Control, Guangdong Province Engineering Laboratory for Air Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, PR China
| | - Zhangfa Tong
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Junge Yun
- College of Environment and Resources, Xiangtan University, Xiangtan, 411105, PR China
| | - Xueying Jiang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Chengxian Liu
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Keju Wang
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China
| | - Yun Zou
- School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China.
| | - Zhihang Chen
- Guangdong Key Lab of Water & Air Pollution Control, Guangdong Province Engineering Laboratory for Air Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou 510655, PR China; College of Environment and Resources, Xiangtan University, Xiangtan, 411105, PR China.
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Wang Z, Peng S, Zhu C, Wang B, Du B, Cheng T, Jiang Z, Sun L. Study of the denitration performance of a ceramic filter using a manganese-based catalyst. RSC Adv 2022; 13:344-354. [PMID: 36605665 PMCID: PMC9769093 DOI: 10.1039/d2ra06677g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Accepted: 12/13/2022] [Indexed: 12/24/2022] Open
Abstract
A MnO x /γ-Al2O3 catalyst was prepared by impregnation of manganese acetate and alumina. After optimizing the composition, it was loaded into a ceramic filter (CF) by a one-step coating method. The results show that MnO x /γ-Al2O3 had the best denitration activity when the Mn loading was 4 wt% with a calcination temperature of 400 °C. The MnO x /γ-Al2O3 catalyst ceramic filter (MA-CCF) was made by loading the CF twice with MnO x /γ-Al2O3. When face velocity (FV) was 1 m min-1, MA-CCF displayed more than 80% NO conversion at 125-375 °C and possessed a good resistance of H2O and SO2. The abundant surface adsorbed oxygen, dense membrane and high-density fiber structure on the outer layer of CF effectively protected the catalyst and could improve MA-CCF denitration activity. The multiple advantages of MA-CCF made it possible for good application prospects.
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Affiliation(s)
- Zhenzhen Wang
- School of Resource and Environmental Engineering, Hefei University of TechnologyHefei230009China,Anhui Academy for Ecological and Environmental Science ResearchHefei230071China
| | - Shuchuan Peng
- School of Resource and Environmental Engineering, Hefei University of TechnologyHefei230009China
| | - Chengzhu Zhu
- School of Resource and Environmental Engineering, Hefei University of TechnologyHefei230009China
| | - Bin Wang
- CNBM Environmental Protection Research Institute(Jiangsu)Co., Ltd.Yancheng224051China
| | - Bo Du
- School of Resource and Environmental Engineering, Hefei University of TechnologyHefei230009China
| | - Ting Cheng
- School of Resource and Environmental Engineering, Hefei University of TechnologyHefei230009China
| | - Zhaozhong Jiang
- School of Resource and Environmental Engineering, Hefei University of TechnologyHefei230009China
| | - Lei Sun
- Anhui Academy for Ecological and Environmental Science ResearchHefei230071China
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Zhao S, Song K, Zhu J, Ma D, Shi JW. Gd-Mn-Ti composite oxides anchored on waste coal fly ash for the low-temperature catalytic reduction of nitrogen oxide. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Yang J, Huang Y, Su J, Chen L, Zhang M, Gao M, Yang M, Wang F, Zhang X, Shen B. Low temperature denitrification and mercury removal of Mn/TiO2-based catalysts: A review of activities, mechanisms, and deactivation. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121544] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Recent Breakthroughs and Advancements in NO x and SO x Reduction Using Nanomaterials-Based Technologies: A State-of-the-Art Review. NANOMATERIALS 2021; 11:nano11123301. [PMID: 34947650 PMCID: PMC8703905 DOI: 10.3390/nano11123301] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 11/20/2021] [Accepted: 11/30/2021] [Indexed: 11/16/2022]
Abstract
Nitrogen and sulpher oxides (NOx, SOx) have become a global issue in recent years due to the fastest industrialization and urbanization. Numerous techniques are used to treat the harmful exhaust emissions, including dry, traditional wet and hybrid wet-scrubbing techniques. However, several difficulties, including high-energy requirement, limited scrubbing-liquid regeneration, formation of secondary pollutants and low efficiency, limit their industrial utilization. Regardless, the hybrid wet-scrubbing technology is gaining popularity due to low-costs, less-energy consumption and high-efficiency removal of air pollutants. The removal/reduction of NOx and SOx from the atmosphere has been the subject of several reviews in recent years. The goal of this review article is to help scientists grasp the fundamental ideas and requirements before using it commercially. This review paper emphasizes the use of green and electron-rich donors, new breakthroughs, reducing GHG emissions, and improved NOx and SOx removal catalytic systems, including selective/non-catalytic reduction (SCR/SNCR) and other techniques (functionalization by magnetic nanoparticles; NP, etc.,). It also explains that various wet-scrubbing techniques, synthesis of solid iron-oxide such as magnetic (Fe3O4) NP are receiving more interest from researchers due to the wide range of its application in numerous fields. In addition, EDTA coating on Fe3O4 NP is widely used due to its high stability over a wide pH range and solid catalytic systems. As a result, the Fe3O4@EDTA-Fe catalyst is projected to be an optimal catalyst in terms of stability, synergistic efficiency, and reusability. Finally, this review paper discusses the current of a heterogeneous catalytic system for environmental remedies and sustainable approaches.
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Zhao S, Shi JW, Niu C, Wang B, He C, Liu W, Xiao L, Ma D, Wang H, Cheng Y. FeVO 4-supported Mn–Ce oxides for the low-temperature selective catalytic reduction of NO x by NH 3. Catal Sci Technol 2021. [DOI: 10.1039/d1cy01424b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Iron vanadate (FeVO4) nanorods are used as a carrier to support manganese (Mn) and cerium (Ce) oxides for the selective catalytic reduction (SCR) of nitrogen oxides (NOx) with NH3 for the first time.
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Affiliation(s)
- Shuqi Zhao
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Jian-Wen Shi
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Cihang Niu
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Baorui Wang
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Chi He
- Department of Environmental Science and Engineering, State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Wei Liu
- Qiyuan (Xi'an) Dae Young Environmental Protection Technology Co., Ltd., Xi'an 710018, China
| | - Lei Xiao
- Qiyuan (Xi'an) Dae Young Environmental Protection Technology Co., Ltd., Xi'an 710018, China
| | - Dandan Ma
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Hongkang Wang
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Yonghong Cheng
- State Key Laboratory of Electrical Insulation and Power Equipment, Center of Nanomaterials for Renewable Energy, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
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