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Li J, Chen K, Lin L, Han S, Meng F, Hu E, Qin W, Gao Y, Jiang J. Product Selection Toward High-Value Hydrogen and Bamboo-Shaped Carbon Nanotubes from Plastic Waste by Catalytic Microwave Processing. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:14675-14686. [PMID: 39102504 DOI: 10.1021/acs.est.4c03471] [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: 08/07/2024]
Abstract
The escalating levels of plastic waste and energy crises underscore the urgent need for effective waste-to-energy strategies. This study focused on converting polypropylene wastes into high-value products employing various iron-based catalysts and microwave radiative thermal processing. The Al-Fe catalysts exhibited exceptional performance, achieving a hydrogen utilization efficiency of 97.65% and a yield of 44.07 mmol/g PP. The gas yields increased from 19.99 to 94.21 wt % compared to noncatalytic experiments. Furthermore, this catalytic system produced high-value bamboo-shaped carbon nanotubes that were absent in other catalysts. The mechanism analysis on catalytic properties and product yields highlighted the significance of oxygen vacancies in selecting high-value products through two adsorption pathways. Moreover, the investigation examined the variations in product distribution mechanisms between conventional and microwave pyrolysis, in which microwave conditions resulted in 4 times higher hydrogen yields. The technoeconomic assessment and Monte Carlo risk analysis further compared the disparity. The microwave technique had a remarkable internal rate of return (IRR) of 39%, leading to an income of $577/t of plastic with a short payback period of 2.5 years. This research offered sustainable solutions for the plastic crisis, validating the potential applicability of commercializing the research outcomes in real-world scenarios.
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Affiliation(s)
- Jinglin Li
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Kailun Chen
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Li Lin
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Siyu Han
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Fanzhi Meng
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Endian Hu
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Weikai Qin
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Yuchen Gao
- School of Environment, Tsinghua University, Beijing, 100084, China
| | - Jianguo Jiang
- School of Environment, Tsinghua University, Beijing, 100084, China
- Collaborative Innovation Center for Regional Environmental Quality, Tsinghua University, Beijing, 100084, China
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Xiong Z, Zhang Y, Yang Q, Zhou F, Lu W, Shi H, Lu S. Promotional effect of nickel doping on the W/Fe2O3 catalyst for selective catalytic reduction of NO with NH3. MOLECULAR CATALYSIS 2023. [DOI: 10.1016/j.mcat.2022.112902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Geng X, Xie C, Zhu B, Chen J, Sun Y, Xu M. Calcium poisoning mechanism on the selective catalytic reduction of NO x by ammonia over the γ-Fe 2O 3 (001) surface. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:88256-88268. [PMID: 35831648 DOI: 10.1007/s11356-022-21912-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Accepted: 07/04/2022] [Indexed: 06/15/2023]
Abstract
γ-Fe2O3 has an excellent low-temperature selective catalytic reduction (SCR) deNOx performance, but its resistance to alkaline earth metal calcium (Ca) is poor. In particular, the detailed mechanism of Ca poisoning on the γ-Fe2O3 catalyst at the atomic level is not clear. Hence, the density functional theory method was used in this research to investigate the influence mechanism of Ca poisoning on the NH3-SCR over the γ-Fe2O3 catalyst surface. The findings reveal that NH3, NO, and O2 molecules can bind to the γ-Fe2O3 (001) surface to generate coordinated ammonia, monodentate nitroso, and adsorption oxygen species, respectively. The main active site is Fe1-top. For the γ-Fe2O3 with Ca poisoning, the Ca atom has a high adsorption energy on the surface of γ-Fe2O3 (001), which covers the catalyst surface and reduces the active sites. The presence of Ca atom decreases the adsorption performance of NH3, while slightly improving the NO and O2 adsorption. In particular, the Ca atom restrains the NH3 activation and NH2 formation, which is detrimental to the NH3-SCR process.
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Affiliation(s)
- Xuan Geng
- School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, Jiangsu, 213164, People's Republic of China
| | - Chaoyue Xie
- School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, Jiangsu, 213164, People's Republic of China
| | - Baozhong Zhu
- School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, Jiangsu, 213164, People's Republic of China
| | - Jiuyu Chen
- School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, Jiangsu, 213164, People's Republic of China
| | - Yunlan Sun
- School of Petroleum and Natural Gas Engineering, Changzhou University, Changzhou, Jiangsu, 213164, People's Republic of China.
| | - Minggao Xu
- Center for Advanced Combustion and Energy, University of Science and Technology of China, Hefei, Anhui, 230026, People's Republic of China
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Koo PL, Choong ZY, Gasim MF, Khoerunnisa F, Jaafar NF, Saputra E, Oh WD. Promotional effect of Ca doping on Bi 2Fe 4O 9 as peroxymonosulfate activator for gatifloxacin removal. CHEMOSPHERE 2022; 307:135619. [PMID: 35835247 DOI: 10.1016/j.chemosphere.2022.135619] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 06/21/2022] [Accepted: 07/03/2022] [Indexed: 06/15/2023]
Abstract
A series of Ca-doped bismuth ferrite was prepared at various %w/w of Ca via a facile hydrothermal method to obtain Bi2XCa2(1-X)Fe4O9 (denoted as BFOCa-X, where X = 1, 0.95, 0.90, 0.80, 0.50). The BFOCa-X catalysts were characterized, and the results showed that they consist of pure phase BFO with nanosheet-like morphology. The as-prepared BFOCa-X catalysts were used as peroxymonosulfate (PMS) activator for gatifloxacin (GAT) removal. It was found that the catalytic activity decreased in the following order: BFOCa-0.8 (90.2% GAT removal efficiency in 45 min, kapp = 0.084 min-1)>BFOCa-0.95 > BFOCa-0.9 > BFOCa-0.5 > BFO indicating that BFOCa-0.8 has the optimized active sites for catalysis. The Ca dopant contributed to the increased oxygen vacancies and surface hydroxyl groups, promoting the catalytic PMS activation process. The kapp value increased gradually with increasing catalyst loading and PMS dosage while pH 9 presented the highest GAT removal rate. The GAT degradation rate was inhibited by PO43-, humic acid and NH4+ but promoted in the presence of Cl-, NO3- and HCO3-. It was also found that the GAT can undergo several degradation pathways in the catalytic PMS system, which eventually mineralized into innocuous compounds. The dominant reactive oxygen species (ROS) were identified using chemical scavengers, revealing that SO4•-, 1O2 and •OH contributed significantly to GAT degradation. Based on the XPS study, PMS was activated by the Fe2+/Fe3+ redox cycling and oxygen vacancies to produce SO4•-/•OH and 1O2, respectively. Overall, the BFOCa-0.8 also showed excellent reusability up to at least 4 cycles with low Bi and Fe leaching (<7 and 62 μg L-1, respectively), indicating that it has promising potential for application as PMS activator for antibiotics removal.
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Affiliation(s)
- Pooi-Ling Koo
- School of Chemical Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia
| | - Zheng-Yi Choong
- School of Chemical Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia
| | | | - Fitri Khoerunnisa
- Department of Chemistry, Indonesia University of Education, Setiabudhi 229, Bandung, 40154, Indonesia
| | - Nur Farhana Jaafar
- School of Chemical Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia
| | - Edy Saputra
- Department of Chemical Engineering, Universitas Riau, Pekanbaru, 28293, Indonesia.
| | - Wen-Da Oh
- School of Chemical Sciences, Universiti Sains Malaysia, 11800, Penang, Malaysia.
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Hao C, Zhang C, Zhang J, Wu J, Yue Y, Qian G. An efficient strategy to screen an effective catalyst for NOx-SCR by deducing surface species using DRIFTS. J Colloid Interface Sci 2022; 606:677-687. [PMID: 34416457 DOI: 10.1016/j.jcis.2021.08.070] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 08/09/2021] [Accepted: 08/09/2021] [Indexed: 11/28/2022]
Abstract
HYPOTHESIS Transition metal supported TiO2 is one of the hottest catalysts in the field of selective catalytic reduction (SCR) of nitrogen oxides. Various formulas have been put forward for an enhanced activity. However, seldom work emphasizes on easy and fast screening of an effective catalyst. EXPERIMENTS In this work, Diffuse Reflection Fourier Transform Infrared (DRIFTS) screened catalyst by analyzing intermediates during SCR. FINDINGS TiO2 provided main adsorption sites for NH3 and the "Eley-Rideal" mechanism dominated the catalysis. The transition metals served as the bridge of electron transport. Moreover, the area reduction rate of adsorbed NH3 and NH4+ species in DRIFTS represented the electron-transfer rate as well as catalytic activity. In other words, a faster area reduction indicated a better SCR activity. Therefore, this work supplied a fast strategy to screen the most effective catalyst among different materials even without using a nitrogen oxides detector. At the same time, less ammonia and nitrogen oxides were used or discharged.
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Affiliation(s)
- Cuicui Hao
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai 200444, PR China
| | - Chenchen Zhang
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai 200444, PR China
| | - Jia Zhang
- SHU Center of Green Urban Mining & Industry Ecology, School of Environmental and Chemical Engineering, Shanghai University, No. 381 Nanchen Road, Shanghai 200444, PR China.
| | - Jianzhong Wu
- MGI of Shanghai University, Xiapu Town, Xiangdong District, Pingxiang City, Jiangxi 337022, PR China
| | - Yang Yue
- MGI of Shanghai University, Xiapu Town, Xiangdong District, Pingxiang City, Jiangxi 337022, PR China
| | - Guangren Qian
- MGI of Shanghai University, Xiapu Town, Xiangdong District, Pingxiang City, Jiangxi 337022, PR China.
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Zhang W, Tang Y, Xiao W, Ruan M, Yin Y, Song Q, Xie K, Qin C, Dong M, Zhou Y, Li J. Promotional mechanism of enhanced denitration activity with Cu modification in a Ce/TiO 2-ZrO 2 catalyst for a low temperature NH 3-SCR system. RSC Adv 2021; 12:378-388. [PMID: 35424492 PMCID: PMC8978642 DOI: 10.1039/d1ra06325a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 01/10/2022] [Accepted: 12/13/2021] [Indexed: 01/26/2023] Open
Abstract
This study aims to investigate the enhanced low temperature denitration activity and promotional mechanism of a cerium-based catalyst through copper modification. In this paper, copper and cerium oxides were supported on TiO2-ZrO2 by an impregnation method, their catalytic activity tests of selective catalytic reduction (SCR) of NO with NH3 were carried out and their physicochemical properties were characterized. The CuCe/TiO2-ZrO2 catalyst shows obviously enhanced NH3-SCR activity at low temperature (<300 °C), which is associated with the well dispersed active ingredients and the synergistic effect between copper and cerium species (Cu2+ + Ce3+ ↔ Cu+ + Ce4+), and the increased ratios of surface chemisorbed oxygen and Cu+/Cu2+ lead to the enhanced low-temperature SCR activity. The denitration reaction mechanism over the CuCe/TiO2-ZrO2 catalyst was investigated by in situ DRIFTS and DFT studies. Results illustrate that the NH3 is inclined to adsorb on the Cu acidic sites (Lewis acid sites), and the NH2 and NH2NO species are the key intermediates in the low-temperature NH3-SCR process, which can explain the promotional effect of Cu modification on denitration activity of Ce/TiO2-ZrO2 at the molecular level. Finally, we have reasonably concluded a NH3-SCR catalytic cycle involving the Eley-Rideal mechanism and Langmuir-Hinshelwood mechanism, and the former mechanism dominates in the NH3-SCR reaction.
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Affiliation(s)
- Wei Zhang
- College of Energy and Power Engineering, Changsha University of Science & Technology Changsha 410114 China
- Key Laboratory of Renewable Energy Electric-Technology of Hunan Province Changsha 410114 China
| | - Yunhao Tang
- College of Energy and Power Engineering, Changsha University of Science & Technology Changsha 410114 China
- Key Laboratory of Renewable Energy Electric-Technology of Hunan Province Changsha 410114 China
| | - Wei Xiao
- College of Energy and Power Engineering, Changsha University of Science & Technology Changsha 410114 China
- Key Laboratory of Renewable Energy Electric-Technology of Hunan Province Changsha 410114 China
| | - Min Ruan
- College of Energy and Power Engineering, Changsha University of Science & Technology Changsha 410114 China
- Key Laboratory of Renewable Energy Electric-Technology of Hunan Province Changsha 410114 China
| | - Yanshan Yin
- College of Energy and Power Engineering, Changsha University of Science & Technology Changsha 410114 China
- Key Laboratory of Renewable Energy Electric-Technology of Hunan Province Changsha 410114 China
| | - Quanbin Song
- College of Energy and Power Engineering, Changsha University of Science & Technology Changsha 410114 China
- Key Laboratory of Renewable Energy Electric-Technology of Hunan Province Changsha 410114 China
| | - Kang Xie
- College of Energy and Power Engineering, Changsha University of Science & Technology Changsha 410114 China
- Key Laboratory of Renewable Energy Electric-Technology of Hunan Province Changsha 410114 China
| | - Chuan Qin
- College of Energy and Power Engineering, Changsha University of Science & Technology Changsha 410114 China
- Key Laboratory of Renewable Energy Electric-Technology of Hunan Province Changsha 410114 China
| | - Mengyao Dong
- College of Energy and Power Engineering, Changsha University of Science & Technology Changsha 410114 China
- Key Laboratory of Renewable Energy Electric-Technology of Hunan Province Changsha 410114 China
| | - Yunhe Zhou
- College of Energy and Power Engineering, Changsha University of Science & Technology Changsha 410114 China
- Key Laboratory of Renewable Energy Electric-Technology of Hunan Province Changsha 410114 China
| | - Jie Li
- College of Energy and Power Engineering, Changsha University of Science & Technology Changsha 410114 China
- Key Laboratory of Renewable Energy Electric-Technology of Hunan Province Changsha 410114 China
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Wang X, Fang Q, Wang J, Gui K, Thomas HR. Poisoning effect of calcium hydroxide on Fe–Ce/TiO2 catalyst for NO removal: evolution of active species and surface properties. REACTION KINETICS MECHANISMS AND CATALYSIS 2021. [DOI: 10.1007/s11144-021-01980-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Jin Q, Lu Y, Ji W, Yang B, Xu M, Xue Z, Dai Y, Xu H. Selective catalytic reduction of NO over W–Zr-O x/TiO 2: performance study of hierarchical pore structure. RSC Adv 2021; 11:33361-33371. [PMID: 35497562 PMCID: PMC9042316 DOI: 10.1039/d1ra05801k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 09/29/2021] [Indexed: 12/17/2022] Open
Abstract
A series of W–Zr-Ox/TiO2 catalysts with hierarchical pore structure were prepared and used for selective catalytic reduction of NO by NH3.
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Affiliation(s)
- Qijie Jin
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China
| | - Yao Lu
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China
| | - Wenyu Ji
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China
| | - Bo Yang
- Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, PR China
| | - Mutao Xu
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China
| | - Zhiwei Xue
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo, 255049, PR China
| | - Yi Dai
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China
| | - Haitao Xu
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China
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