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Chang C, Yan Z, Zhang C, Zhang Y, Jiang M, Ruan L, Xiao M, Yu Y, He H. Design of Ca-type todorokite catalysts with highly active for the selective reduction of NO x by NH 3 at low temperatures. J Environ Sci (China) 2024; 138:697-708. [PMID: 38135432 DOI: 10.1016/j.jes.2023.04.025] [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: 03/15/2023] [Revised: 04/17/2023] [Accepted: 04/23/2023] [Indexed: 12/24/2023]
Abstract
Ca-type todorokite catalysts were designed and prepared by a simple redox method and applied to the selective reduction of NOx by NH3 (NH3-SCR) for the first time. Compared with the Na-type manjiroite prepared by the same method, the todorokite catalysts with different Mn/Ca ratios showed greatly improved catalytic activity for NOx reduction. Among them, Mn8Ca4 catalyst exhibited the best NH3-SCR performance, achieving 90% NOx conversion within temperature range of 70-275°C and having a high sulphur resistance. Compared to the Na-type manjiroite sample, Ca-type todorokite catalysts possessed an increased size of tunnel, resulting in a larger specific surface area. As increased the amounts of Ca doping, the Na content in Ca-type todorokite catalysts significantly decreased, providing larger amounts of Brønsted acid sites for NH3 adsorption to produce NH4+. The NH4+ species were highly active for reaction with NO + O2, playing a determining role in NH3-SCR process at low temperatures. Meanwhile, larger amounts of surface adsorbed oxygen contained over the Ca-doping samples than that over Na-type manjiroite, promoting the oxidation of NO and fast SCR processes. Over the Ca-type todorokite catalysts, furthermore, nitrates produced during the flow of NO + O2, were more active for reaction with NH3 than that over Na-type manjiroite, benefiting the occurrence of NH3-SCR process. This study provides novel insights into the design of NH3-SCR catalysts with high performance.
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Affiliation(s)
- Chuang Chang
- School of Rare Earths, University of Science and Technology of China, Hefei 230026, China; Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China
| | - Zidi Yan
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China
| | - Chunlei Zhang
- School of Rare Earths, University of Science and Technology of China, Hefei 230026, China; Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China
| | - Yanshuang Zhang
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China
| | - Miao Jiang
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China
| | - Luna Ruan
- School of Rare Earths, University of Science and Technology of China, Hefei 230026, China; Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China
| | - Min Xiao
- Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China
| | - Yunbo Yu
- School of Rare Earths, University of Science and Technology of China, Hefei 230026, China; Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China; State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Hong He
- School of Rare Earths, University of Science and Technology of China, Hefei 230026, China; Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, 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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Zhang X, Jin S, Liu S, Chen Y, Fang C, Wang K, Wang X, Wu X, Wang J. Low-Temperature NH 3-SCR over Hierarchical MnO x Supported on Montmorillonite Prepared by Different Methods. ACS OMEGA 2023; 8:13384-13395. [PMID: 37065025 PMCID: PMC10099437 DOI: 10.1021/acsomega.3c00718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 03/21/2023] [Indexed: 06/19/2023]
Abstract
Hierarchical MnO x pillared or supported on montmorillonite were prepared by three methods, i.e., impregnation (IM), chemical precipitation (CP), and in situ deposition (SP). The catalysts were characterized by low-temperature N2 adsorption (BET), XRD, XPS, SEM, TEM, H2-TPR, NH3-TPD, NO-TPD, TPSR, in situ DRIFTS, and evaluation of catalytic performance for NH3-SCR. The best catalytic performance was obtained for catalysts prepared by SP in terms of activity and selectivity, obtaining >90% NO conversion with >95% selectivity to N2 in 100-300 °C and GHSV of 70,000 h-1. Compared to IM and CP, SP greatly simplified catalyst preparation, resulting in higher BET surface areas; a spongy pore structure; more highly dispersed, pillared MnO x species; and higher density of acid sites distributed on catalysts surface, which all contributed to its superior performance for NH3-SCR. The activity for low-temperature NH3-SCR of manganese catalysts could be widely tailored by preparation methods.
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Affiliation(s)
- Xianlong Zhang
- School
of Chemistry and Chemical Engineering, Hefei
University of Technology, Hefei 230009, China
- Anhui
Province Key Laboratory of Advanced Catalytic Materials and Reaction
Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
| | - Shi Jin
- School
of Chemistry and Chemical Engineering, Hefei
University of Technology, Hefei 230009, China
| | - Shiwen Liu
- School
of Chemistry and Chemical Engineering, Hefei
University of Technology, Hefei 230009, China
| | - Yazhong Chen
- School
of Chemistry and Chemical Engineering, Hefei
University of Technology, Hefei 230009, China
| | - Cheng Fang
- School
of Chemistry and Chemical Engineering, Hefei
University of Technology, Hefei 230009, China
| | - Kui Wang
- School
of Chemistry and Chemical Engineering, Hefei
University of Technology, Hefei 230009, China
| | - Xinyu Wang
- School
of Chemistry and Chemical Engineering, Hefei
University of Technology, Hefei 230009, China
| | - Xueping Wu
- School
of Chemistry and Chemical Engineering, Hefei
University of Technology, Hefei 230009, China
- Anhui
Province Key Laboratory of Advanced Catalytic Materials and Reaction
Engineering, School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China
- Engineering
Research Center of Advanced Composite Materials Design & Application
of Anhui Province, Hefei 230009, China
| | - Junwei Wang
- College
of Chemistry and Chemical Engineering, Anqing
Normal University, Anqing 246011, China
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Yuan L, Hu P, Hu B, Han J, Ma S, Yang F, Volinsky AA. Metallic and non-metallic components and morphology of iron-based catalytic effects for selective catalytic reduction performance: A systematic review. MOLECULAR CATALYSIS 2023. [DOI: 10.1016/j.mcat.2023.113113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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Wang X, Ye Q, Liu W, Meng F, Yang F, Zhang X, Dai H. Enhanced Resistance to Pb Poisoning of the Co‐modified Mn/Fe‐pillared Clay Catalysts for NH
3
‐SCR at Low Temperatures. ChemistrySelect 2023. [DOI: 10.1002/slct.202204336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Affiliation(s)
- Xinpeng Wang
- Department of Environmental Science Faculty of Environment and Life Beijing University of Technology Beijing 100124 China
| | - Qing Ye
- Department of Environmental Science Faculty of Environment and Life Beijing University of Technology Beijing 100124 China
| | - Wenyi Liu
- Department of Environmental Science Faculty of Environment and Life Beijing University of Technology Beijing 100124 China
| | - Fanwei Meng
- Department of Environmental Science Faculty of Environment and Life Beijing University of Technology Beijing 100124 China
| | - Fan Yang
- Department of Environmental Science Faculty of Environment and Life Beijing University of Technology Beijing 100124 China
| | - Xin Zhang
- State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing 102249 China
| | - Hongxing Dai
- Department of Chemical Engineering Faculty of Environment and Life Beijing University of Technology Beijing 100124 China
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Xie J, Ye Y, Li Q, Kang T, Hou S, Jin Q, He F, Fang D. Denitrification performance and sulfur resistance mechanism of Sm-Mn catalyst for low temperature NH3-SCR. Front Chem Sci Eng 2023. [DOI: 10.1007/s11705-022-2258-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
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Guo RT, Qin B, Wei LG, Yin TY, Zhou J, Pan WG. Recent progress of low-temperature selective catalytic reduction of NOx with NH3 over manganese oxide-based catalysts. Phys Chem Chem Phys 2022; 24:6363-6382. [DOI: 10.1039/d1cp05557g] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Selective catalytic reduction with NH3 (NH3−SCR) was the most efficient approach to mitigate the emission of nitrogen oxides (NOx). Although the conventional manganese oxide-based catalyst had gradually become a kind...
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Xu D, Wu W, Wang P, Deng J, Yan T, Zhang D. Boosting the Alkali/Heavy Metal Poisoning Resistance for NO Removal by Using Iron-Titanium Pillared Montmorillonite Catalysts. JOURNAL OF HAZARDOUS MATERIALS 2020; 399:122947. [PMID: 32521318 DOI: 10.1016/j.jhazmat.2020.122947] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 05/04/2020] [Accepted: 05/09/2020] [Indexed: 06/11/2023]
Abstract
It is still a big challge to improve the alkali and heavy metal resistance of deNOx catalysts for selective catalytic reduction (SCR) of NOx with NH3. In this study, a novel catalyst developed by pillaring montmorillonite with iron and titanium (Fe-Ti-MMT) was proposed. It is quite interesting that high resistance to alkaline and heavy metals has been demonstrated by using Fe-Ti-MMT catalysts. It has been demonstrated that the specific pillaring synthesis procedure and further addition of the Ti pillared sites greatly contributed to the wide active temperature window and enhanced the resistance to alkali and heavy metal. The higher ratio of active Fe2+ species, more active acid sites, and enhanced ammonia adsorption indicated the remarkable activity as well as K and Pb resistance. Moreover, the K and Pb poisons would promote the generation of active adsorbed NOx species on the Fe-Ti-MMT but induce the formation of stable inactive ones on that of Fe-MMT, which greatly tuned the reaction pathways and improved the reaction rate for Ti modified Fe pillared MMT catalysts. The strategy of incorporating Ti into the Fe pillared MMT catalysts strongly provides a novel inspiration for keeping excellent NH3-SCR performance in the presence of alkali/heavy metal for NOx removal.
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Affiliation(s)
- Dong Xu
- Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials of Ministry of Education, Anhui University of Technology, Ma'anshan, 243002, China
| | - Wenhao Wu
- Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials of Ministry of Education, Anhui University of Technology, Ma'anshan, 243002, China; Research Center of Nano Science and Technology, Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, China
| | - Penglu Wang
- Research Center of Nano Science and Technology, Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, China.
| | - Jiang Deng
- Research Center of Nano Science and Technology, Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, China
| | - Tingting Yan
- Research Center of Nano Science and Technology, Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, China
| | - Dengsong Zhang
- Research Center of Nano Science and Technology, Department of Chemistry, College of Sciences, Shanghai University, Shanghai, 200444, China.
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