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Zhao F, Wang D, Li X, Yin Y, Wang C, Qiu L, Yu J, Chang H. Enhancement of Cs on Co 3O 4 for N 2O Catalytic Decomposition: N 2O Activation and O 2 Desorption. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c01955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Feilin Zhao
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Dongdong Wang
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Xing Li
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Yimeng Yin
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Chizhong Wang
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Lei Qiu
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Jie Yu
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Huazhen Chang
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
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Physicochemical Features and NH3-SCR Catalytic Performance of Natural Zeolite Modified with Iron—The Effect of Fe Loading. Catalysts 2022. [DOI: 10.3390/catal12070731] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
In modern dual-pressure nitric acid plants, the tail gas temperature usually exceeds 300 °C. The NH3-SCR catalyst used in this temperature range must be resistant to thermal deactivation, so commercial vanadium-based systems, such as V2O5-WO3 (MoO3)-TiO2, are most commonly used. However, selectivity of this material significantly decreases above 350 °C due to the increase in the rate of side reactions, such as oxidation of ammonia to NO and formation of N2O. Moreover, vanadium compounds are toxic for the environment. Thus, management of the used catalyst is complicated. One of the alternatives to commercial V2O5-TiO2 catalysts are natural zeolites. These materials are abundant in the environment and are thus relatively cheap and easily accessible. Therefore, the aim of the study was to design a novel iron-modified zeolite catalyst for the reduction of NOx emission from dual-pressure nitric acid plants via NH3-SCR. The aim of the study was to determine the influence of iron loading in the natural zeolite-supported catalyst on its catalytic performance in NOx conversion. The investigated support was firstly formed into pellets and then impregnated with various contents of Fe precursor. Physicochemical characteristics of the catalyst were determined by XRF, XRD, low-temperature N2 sorption, FT-IR, and UV–Vis. The catalytic performance of the catalyst formed into pellets was tested on a laboratory scale within the range of 250–450 °C using tail gases from a pilot nitric acid plant. The results of this study indicated that the presence of various iron species, including natural isolated Fe3+ and the introduced FexOy oligomers, contributed to efficient NOx reduction, especially in the high-temperature range, where the NOx conversion rate exceeded 90%.
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The Study of C3H6 Impact on Selective Catalytic Reduction by Ammonia (NH3-SCR) Performance over Cu-SAPO-34 Catalysts. Catalysts 2021. [DOI: 10.3390/catal11111327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In present work, the catalytic performance of Cu-SAPO-34 catalysts with or without propylene during the NH3-SCR process was conducted, and it was found that the de-NOx activity decreased during low temperature ranges (<350 °C), but obviously improved within the range of high temperatures (>350 °C) in the presence of propylene. The XRD, BET, TG, NH3-TPD, NOx-TPD, in situ DRIFTS and gas-switch experiments were performed to explore the propylene effect on the structure and performance of Cu-SAPO-34 catalysts. The bulk characterization and TG results revealed that neither coke deposition nor the variation of structure and physical properties of catalysts were observed after C3H6 treatment. Generally speaking, at the low temperatures (<350 °C), active Cu2+ species could be occupied by propylene, which inhibited the adsorption and oxidation of NOx species, confining the SCR reaction rate and causing the deactivation of Cu-SAPO-34 catalysts. However, with the increase of reaction temperatures, the occupied Cu2+ sites would be recovered and sequentially participate into the NH3-SCR reaction. Additionally, C3H6-SCR reaction also showed the synergetic contribution to the improvement of NOx conversion at high temperature (>350 °C).
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Zhang T, Qiu Y, Liu G, Chen J, Peng Y, Liu B, Li J. Nature of active Fe species and reaction mechanism over high-efficiency Fe/CHA catalysts in catalytic decomposition of N2O. J Catal 2020. [DOI: 10.1016/j.jcat.2020.10.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Fe-Exchanged Small-Pore Zeolites as Ammonia Selective Catalytic Reduction (NH3-SCR) Catalysts. Catalysts 2020. [DOI: 10.3390/catal10111324] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Cu-exchanged small-pore zeolites have been extensively studied in the past decade as state-of-the-art selective catalytic reduction (SCR) catalysts for diesel engine exhaust NOx abatement for the transportation industry. During this time, Fe-exchanged small-pore zeolites, e.g., Fe/SSZ-13, Fe/SAPO-34, Fe/SSZ-39 and high-silica Fe/LTA, have also been investigated but much less extensively. In comparison to their Cu-exchanged counterparts, such Fe/zeolite catalysts display inferior low-temperature activities, but improved stability and high-temperature SCR selectivities. Such characteristics entitle these catalysts to be considered as key components of highly efficient emission control systems to improve the overall catalyst performance. In this short review, recent studies on Fe-exchanged small-pore zeolite SCR catalysts are summarized, including (1) the synthesis of small-pore Fe/zeolites; (2) nature of the SCR active Fe species in these catalysts as determined by experimental and theoretical approaches, including Fe species transformation during hydrothermal aging; (3) SCR reactions and structure-function correlations; and (4) a few aspects on industrial applications.
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Zeng J, Chen S, Fan Z, Wang C, Chang H, Li J. Simultaneous Selective Catalytic Reduction of NO and N2O by NH3 over Fe-Zeolite Catalysts. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c02909] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jie Zeng
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Siyu Chen
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Zhenhui Fan
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Chizhong Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Huazhen Chang
- School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
| | - Junhua Li
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
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Selective Catalytic Reduction of N2O by CO over Fe-Beta Zeolites Catalysts: Influence of Iron Species Distribution. CATALYSIS SURVEYS FROM ASIA 2020. [DOI: 10.1007/s10563-020-09313-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Yao H, Cai S, Yang B, Han L, Wang P, Li H, Yan T, Shi L, Zhang D. In situ decorated MOF-derived Mn–Fe oxides on Fe mesh as novel monolithic catalysts for NOx reduction. NEW J CHEM 2020. [DOI: 10.1039/c9nj05960a] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In situ decorated MOF-derived Mn–Fe oxides on Fe mesh were developed as novel monolithic catalysts for NOx reduction.
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Affiliation(s)
- Heyan Yao
- Special Glass Key Lab of Hainan Province
- School of Materials Science and Engineering
- Hainan University
- Haikou 570228
- China
| | - Sixiang Cai
- Special Glass Key Lab of Hainan Province
- School of Materials Science and Engineering
- Hainan University
- Haikou 570228
- China
| | - Bo Yang
- Research Center of Nano Science and Technology
- Department of Chemistry
- Shanghai University
- Shanghai
- China
| | - Lupeng Han
- Research Center of Nano Science and Technology
- Department of Chemistry
- Shanghai University
- Shanghai
- China
| | - Penglu Wang
- Research Center of Nano Science and Technology
- Department of Chemistry
- Shanghai University
- Shanghai
- China
| | - Hongrui Li
- Research Center of Nano Science and Technology
- Department of Chemistry
- Shanghai University
- Shanghai
- China
| | - Tingting Yan
- Research Center of Nano Science and Technology
- Department of Chemistry
- Shanghai University
- Shanghai
- China
| | - Liyi Shi
- Research Center of Nano Science and Technology
- Department of Chemistry
- Shanghai University
- Shanghai
- China
| | - Dengsong Zhang
- Special Glass Key Lab of Hainan Province
- School of Materials Science and Engineering
- Hainan University
- Haikou 570228
- China
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