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Rizzetto A, Sartoretti E, Khoma K, Armandi M, Piumetti M, Bensaid S, Pirone R. The Oscillatory Behaviour of Cu-ZSM-5 Catalysts for N 2O Decomposition: Investigation of Cu Species by Complementary Techniques. Chemphyschem 2024:e202400339. [PMID: 38688862 DOI: 10.1002/cphc.202400339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Revised: 04/29/2024] [Accepted: 04/29/2024] [Indexed: 05/02/2024]
Abstract
Copper-exchanged ZSM-5 (Cu-ZSM-5) is a promising catalyst thanks to the Cu redox pair. A particular feature of this material consists in the presence of spontaneous isothermal oscillations which take place during N2O decomposition reaction, depending on the operating conditions. In the present work, a set of five Cu-ZSM-5 catalysts was synthesised by three procedures and three different copper precursor concentrations: i) wet impregnation, ii) single ion exchange, and iii) double ion exchange. Catalytic tests revealed that the ion-exchanged samples exhibit a low catalytic activity and no oscillatory behaviour, except for the twice-exchanged sample which achieves an average N2O conversion of 26 % at 400 °C. Conversely, the impregnated samples reach higher levels of N2O conversion (66 % for Cu5ZSM5_WI and 72 % for Cu10ZSM5_WI) and demonstrate a similar oscillating pattern. Further investigations disclosed that the most active catalysts, characterised by the presence of oscillatory behaviour, have more abundant and easily reducible copper species (ICP, EDX and H2-TPR) which interact better with the zeolitic support (FT-IR). Catalytic tests under a long time on stream (TOS) suggest that either self-organised patterns or deterministic chaos can be achieved during the reaction, depending on the operating conditions, such as temperature and contact time.
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Affiliation(s)
- Andrea Rizzetto
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129, Turin, Italy
| | - Enrico Sartoretti
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129, Turin, Italy
| | - Khrystyna Khoma
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129, Turin, Italy
| | - Marco Armandi
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129, Turin, Italy
| | - Marco Piumetti
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129, Turin, Italy
| | - Samir Bensaid
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129, Turin, Italy
| | - Raffaele Pirone
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129, Turin, Italy
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Jraba N, Makhlouf T, Delahay G, Tounsi H. Catalytic activity of Cu/η-Al 2O 3 catalysts prepared from aluminum scraps in the NH 3-SCO and in the NH 3-SCR of NO. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:9053-9064. [PMID: 34494193 DOI: 10.1007/s11356-021-16206-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 08/24/2021] [Indexed: 06/13/2023]
Abstract
Copper-loaded η-alumina catalysts with different copper contents were prepared by impregnation/evaporation method. The catalysts were characterized by XRD, FTIR, BET, UV-Vis, and H2-TPR and evaluated, for the first time, in the selective catalytic reduction of NO by NH3 and in the selective catalytic oxidation of NH3. The characterization techniques showed that the impregnation/evaporation method permits to obtain highly dispersed copper oxide species on the η-alumina surface when a low amount of copper is used (1wt. % and 2 wt.%). The wet impregnation method made it possible to reach a well dispersion of the copper species on the surface of the alumina for the low copper contents Cu(1)-Al2O3 and Cu(2)-Al2O3. The latter justifies the similar behavior of Cu(1)-Al2O3) and Cu(2)-Al2O3 in the selective catalytic oxidation of NH3 where these catalysts exhibit a conversion of NH3 to N2 of the order of 100% at T> 500 °C.
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Affiliation(s)
- Nawel Jraba
- Laboratory of Georesources, Materials, Environments and Global Changes, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia.
| | - Thabet Makhlouf
- Laboratory of Georesources, Materials, Environments and Global Changes, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
| | - Gerard Delahay
- ICGM, Université Montpellier, ENSCM, CNRS, Montpellier, France
| | - Hassib Tounsi
- Laboratory of Advanced Materials, National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia
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3
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McCaffery C, Zhu H, Tang T, Li C, Karavalakis G, Cao S, Oshinuga A, Burnette A, Johnson KC, Durbin TD. Real-world NOx emissions from heavy-duty diesel, natural gas, and diesel hybrid electric vehicles of different vocations on California roadways. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 784:147224. [PMID: 33905931 DOI: 10.1016/j.scitotenv.2021.147224] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 04/11/2021] [Accepted: 04/14/2021] [Indexed: 05/28/2023]
Abstract
This study assessed the real-world nitrogen oxide (NOx) emissions from 50 heavy-duty vehicles of different vocations and engine technologies using portable emissions measurement systems (PEMS). This is one of the most comprehensive in-use emissions studies conducted to date, which played a key role in the development of CARB's (California Air Recourses Board) updated EMission FACtor (EMFAC) model, especially for natural gas vehicles. In-use emissions testing was performed on school and transit buses, refuse haulers, goods movement vehicles, and delivery vehicles while were driven over their normal operating routes in the South Coast Air Basin. Engine technologies included diesel engines with and without selective catalytic reduction (SCR) systems, compressed natural gas (CNG) engines and liquified petroleum gas (LPG) engines, and SCR-equipped diesel hybrid electric vehicles. For most vehicles, the in-use NOx emissions were higher than the certification standards for the engine. Diesel vehicles generally showed higher brake-specific NOx emissions compared to the CNG vehicles. NOx emissions were strongly dependent on the SCR temperature, with SCR temperatures below 200 °C resulting in elevate brake-specific NOx. The 0.02 g/bhp-hr certified CNG vehicles showed the largest reductions in NOx emissions. The diesel hybrid electric vehicles showed important distance-specific NOx benefits compared to the conventional diesel vehicles, but higher emissions compared to the CNG and LPG vehicles. Overall, average NOx reductions were 75%, 94%, 65%, 79%, respectively, for the 0.2 CNG, 0.02 CNG, diesel hybrid electric, and LPG vehicles compared to diesel vehicles, due in part to some diesel vehicles with particularly high emissions, indicating that the widespread implementation of advanced technology and alternative fuel vehicles could provide important NOx reductions and a path for meeting air quality targets in California and elsewhere.
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Affiliation(s)
- Cavan McCaffery
- University of California, Bourns College of Engineering, Center for Environmental Research and Technology (CE-CERT), 1084 Columbia Avenue, Riverside, CA 92507, USA
| | - Hanwei Zhu
- University of California, Bourns College of Engineering, Center for Environmental Research and Technology (CE-CERT), 1084 Columbia Avenue, Riverside, CA 92507, USA; Department of Chemical and Environmental Engineering, Bourns College of Engineering, University of California, Riverside, CA 92521, USA
| | - Tianbo Tang
- University of California, Bourns College of Engineering, Center for Environmental Research and Technology (CE-CERT), 1084 Columbia Avenue, Riverside, CA 92507, USA; Department of Chemical and Environmental Engineering, Bourns College of Engineering, University of California, Riverside, CA 92521, USA
| | - Chengguo Li
- University of California, Bourns College of Engineering, Center for Environmental Research and Technology (CE-CERT), 1084 Columbia Avenue, Riverside, CA 92507, USA
| | - Georgios Karavalakis
- University of California, Bourns College of Engineering, Center for Environmental Research and Technology (CE-CERT), 1084 Columbia Avenue, Riverside, CA 92507, USA; Department of Chemical and Environmental Engineering, Bourns College of Engineering, University of California, Riverside, CA 92521, USA.
| | - Sam Cao
- South Coast Air Quality Management District, 21865 Copley Dr, Diamond Bar, CA 91765, USA
| | - Adewale Oshinuga
- South Coast Air Quality Management District, 21865 Copley Dr, Diamond Bar, CA 91765, USA
| | | | - Kent C Johnson
- University of California, Bourns College of Engineering, Center for Environmental Research and Technology (CE-CERT), 1084 Columbia Avenue, Riverside, CA 92507, USA; Department of Chemical and Environmental Engineering, Bourns College of Engineering, University of California, Riverside, CA 92521, USA
| | - Thomas D Durbin
- University of California, Bourns College of Engineering, Center for Environmental Research and Technology (CE-CERT), 1084 Columbia Avenue, Riverside, CA 92507, USA; Department of Chemical and Environmental Engineering, Bourns College of Engineering, University of California, Riverside, CA 92521, USA.
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4
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Yao Z, Li L, Liu X, Hui KN, Shi L, Zhou F, Hu M, Hui KS. Mechanistic insights into NO‒H 2 reaction over Pt/boron-doped graphene catalyst. JOURNAL OF HAZARDOUS MATERIALS 2021; 406:124327. [PMID: 33139106 DOI: 10.1016/j.jhazmat.2020.124327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Revised: 10/16/2020] [Accepted: 10/17/2020] [Indexed: 06/11/2023]
Abstract
This work presents a systematical experimental and density functional theory (DFT) studies to reveal the mechanism of NO reduction by H2 reaction over platinum nanoparticles (NPs) deposited on boron-doped graphene (denoted as Pt/BG) catalyst. Both characterizations and DFT calculations identified boron (in Pt/BG) as an additional NO adsorption site other than the widely recognized Pt NPs. Moreover, BG led to a decrease of Pt NPs size in Pt/BG, which facilitated hydrogen spillover. The mathematical and physical criteria of the Langmuir-Hinshelwood dual-site kinetic model over the Pt/BG were satisfied, indicating that adsorbed NO on boron (in Pt/BG) was further activated by H-spillover. On the other hand, Pt/graphene (Pt/Gr) demonstrated a typical Langmuir-Hinshelwood single-site mechanism where Pt NPs solely served as active sites for NO adsorption. This work helps understand NO-H2 reaction over Pt/BG and Pt/Gr catalysts in a closely mechanistic view and provides new insights into roles of active sites for improving the design of catalysts for NO abatement.
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Affiliation(s)
- Zhenhua Yao
- Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, and Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430056, China
| | - Lei Li
- Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology (EBEAM) of Chongqing, Yangtze Normal University, Chongqing 408100, China
| | - Xuguang Liu
- College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Kwun Nam Hui
- Institute of Applied Physics and Materials Engineering (IAPME) University of Macau Avenida da Universidade, Taipa, Macau, China
| | - Ling Shi
- Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, and Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430056, China
| | - Furong Zhou
- Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, and Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430056, China
| | - Maocong Hu
- Hubei Key Laboratory of Industrial Fume and Dust Pollution Control, and Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430056, China.
| | - K S Hui
- School of Engineering, University of East Anglia, Norwich NR4 7TJ, United Kingdom.
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5
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Yang M, Wang H, Jin S, Zhang R, Wang Y, Huo W, Wang X, Jin M, Qiao W, Ling L. Insight into the mechanism of boron-doping of carbon aerogel for enhancing the activity of low-temperature selective catalytic reduction of NO with NH 3. Catal Sci Technol 2021. [DOI: 10.1039/d0cy02006k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Boron doped carbon aerogel could increase the number of active sites effectively and enhance NO reduction to N2via NH3-SCR.
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Affiliation(s)
- Minghe Yang
- School of Materials Science and Engineering
- Shanghai Institute of Technology
- Shanghai
- PR China
| | - He Wang
- School of Materials Science and Engineering
- Shanghai Institute of Technology
- Shanghai
- PR China
| | - Shuangling Jin
- School of Materials Science and Engineering
- Shanghai Institute of Technology
- Shanghai
- PR China
| | - Rui Zhang
- School of Materials Science and Engineering
- Shanghai Institute of Technology
- Shanghai
- PR China
| | - Yan Wang
- School of Materials Science and Engineering
- Shanghai Institute of Technology
- Shanghai
- PR China
| | - Wanying Huo
- School of Materials Science and Engineering
- Shanghai Institute of Technology
- Shanghai
- PR China
| | - Xiaorui Wang
- School of Materials Science and Engineering
- Shanghai Institute of Technology
- Shanghai
- PR China
| | - Minglin Jin
- School of Materials Science and Engineering
- Shanghai Institute of Technology
- Shanghai
- PR China
| | - Wenming Qiao
- State Key Laboratory of Chemical Engineering
- East China University of Science and Technology
- Shanghai
- China
| | - Licheng Ling
- State Key Laboratory of Chemical Engineering
- East China University of Science and Technology
- Shanghai
- China
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6
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Properties of Iron-Modified-by-Silver Supported on Mordenite as Catalysts for NOx Reduction. Catalysts 2020. [DOI: 10.3390/catal10101156] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A series of mono and bimetallic catalysts based on a Fe-Ag mixture deposited on mordenite was prepared by ion-exchange and evaluated in the catalytic activity test of the de-NOx reaction in the presence of CO/C3H6. The activity results showed that the most active samples were the Fe-containing ones, and at high temperatures, a co-promoter effect of Ag on the activity of Fe catalysts was also observed. The influence of the order of cation deposition on catalysts formation and their physicochemical properties was studied by FTIR (Fourier Transform Infrared Spectroscopy) of adsorbed NO, XANES (X-ray Absorption Near-Edge Structure), and EXAFS (Extended X-ray Absorption Fine Structure) and discussed in terms of the state of iron. Results of Fe K-edge XANES oscillations showed that, in FeMOR catalysts, iron was present in a disordered state as Fe3+ and Fe2+. In FeAgMOR, the prevailing species was Fe3+, while in the AgFeMOR catalyst, the state of iron was intermediate or mixed between FeMOR and FeAgMOR. The Fe K-edge EXAFS results were characteristic of a disordered phase, the first coordination sphere being asymmetric with two different Fe-O distances. In FeAgMOR and AgFeMOR, coordination of Fe-O was similar to Fe2O3 with a few amount of Fe2+ species. We may conclude that, in the bimetallic FeAgMOR and AgFeMOR samples, a certain amount of tetrahedral Al3+ ions in the mordenite framework is replaced by Fe3+ ions, confirming the previous reports that these species are active sites for the de-NOx reaction. Based on the thermodynamic analysis and experimental data, also, it was confirmed that the order of deposition of the components influenced the mechanism of active sites’ formation during the two steps ion-exchange synthesis.
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7
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Lee K, Choi B, Lee C, Oh K. Effects of SiO2/Al2O3 ratio, reaction atmosphere and metal additive on de-NOx performance of HC-SCR over Cu-based ZSM-5. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2020.07.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Advanced Opacified Fiber-Reinforced Silica-Based Aerogel Composites for Superinsulation of Exhaust Tubing Systems in Semi-Stationary Motors. MATERIALS 2020; 13:ma13122677. [PMID: 32545469 PMCID: PMC7345644 DOI: 10.3390/ma13122677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 06/05/2020] [Accepted: 06/09/2020] [Indexed: 11/17/2022]
Abstract
Within this study, monolithic three-dimensional silica aerogel (SA) composite parts with super insulating properties are presented. A generic part based on fiber-reinforced (FR) silica aerogel for thermal insulation of the exhaust tubing system—to keep the exhaust gases as hot as possible to improve the efficiency of the catalyst system—was produced via a sol-gel-based molding process in combination with a supercritical drying using scCO2. A thermal conductivity of 16 mW m−1 K−1 was measured via a heat flow meter technique. In this manuscript, we present a full cycle of the material compound design, starting with fundamental material evaluation including aerogel optimization, opacifier influence, and casting process. The obtained generic part in shape of a half-shell for pipe insulation is characterized under real conditions.
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9
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Chen C, Yao A, Yao C, Wang H, Liu M, Li Z. Selective catalytic reduction of nitrogen oxides with methanol over the (cobalt-molybdenum)/alumina dual catalysts under the diesel methanol dual fuel exhaust conditions. Chem Eng Sci 2020. [DOI: 10.1016/j.ces.2019.115320] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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10
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Selective catalytic reduction of NOx with ethanol and other C1–4 oxygenates over Ag/Al2O3 catalysts: A review. Front Chem Sci Eng 2019. [DOI: 10.1007/s11705-019-1847-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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11
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Lee K, Kosaka H, Sato S, Yokoi T, Choi B. Effect of Cu content and zeolite framework of n-C4H10-SCR catalysts on de-NOx performances. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2019.03.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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12
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Effect of ceria and zirconia supports on NO reduction over platinum-group metal catalysts: A DFT study with comparative experiments. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.07.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Tan Y, Henderick P, Yoon S, Herner J, Montes T, Boriboonsomsin K, Johnson K, Scora G, Sandez D, Durbin TD. On-Board Sensor-Based NO x Emissions from Heavy-Duty Diesel Vehicles. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:5504-5511. [PMID: 30995015 DOI: 10.1021/acs.est.8b07048] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Real-world nitrogen oxides (NO x) emissions were estimated using on-board sensor readings from 72 heavy-duty diesel vehicles (HDDVs) equipped with a Selective Catalytic Reduction (SCR) system in California. The results showed that there were large differences between in-use and certification NO x emissions, with 12 HDDVs emitting more than three times the standard during hot-running and idling operations in the real world. The overall NO x conversion efficiencies of the SCR system on many vehicles were well below the 90% threshold that is expected for an efficient SCR system, even when the SCR system was above the optimum operating temperature threshold of 250 °C. This could potentially be associated with SCR catalyst deterioration on some engines. The Not-to-Exceed (NTE) requirements currently used by the heavy-duty in-use compliance program were evaluated using on-board NO x sensor data. Valid NTE events covered only 4.2-16.4% of the engine operation and 6.6-34.6% of the estimated NO x emissions. This work shows that low cost on-board NO x sensors are a convenient tool to monitor in-use NO x emissions in real-time, evaluate the SCR system performance, and identify vehicle operating modes with high NO x emissions. This information can inform certification and compliance programs to ensure low in-use NO x emissions.
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Affiliation(s)
- Yi Tan
- California Air Resources Board, 1001 I Street , Sacramento , California 95814 , United States
| | - Paul Henderick
- California Air Resources Board, 9500 Telstar Avenue, Ste. #2 , El Monte , California 91731 , United States
| | - Seungju Yoon
- California Air Resources Board, 1001 I Street , Sacramento , California 95814 , United States
| | - Jorn Herner
- California Air Resources Board, 1001 I Street , Sacramento , California 95814 , United States
| | - Thomas Montes
- California Air Resources Board, 9500 Telstar Avenue, Ste. #2 , El Monte , California 91731 , United States
| | - Kanok Boriboonsomsin
- College of Engineering - Center for Environmental Research and Technology , University of California at Riverside , 1084 Columbia Avenue , Riverside , California 92507 , United States
| | - Kent Johnson
- College of Engineering - Center for Environmental Research and Technology , University of California at Riverside , 1084 Columbia Avenue , Riverside , California 92507 , United States
| | - George Scora
- College of Engineering - Center for Environmental Research and Technology , University of California at Riverside , 1084 Columbia Avenue , Riverside , California 92507 , United States
| | - Daniel Sandez
- College of Engineering - Center for Environmental Research and Technology , University of California at Riverside , 1084 Columbia Avenue , Riverside , California 92507 , United States
| | - Thomas D Durbin
- College of Engineering - Center for Environmental Research and Technology , University of California at Riverside , 1084 Columbia Avenue , Riverside , California 92507 , United States
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14
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Template-free synthesis of mesoporous Mn3O4-Al2O3 catalyst for low temperature selective catalytic reduction of NO with NH3. J Taiwan Inst Chem Eng 2019. [DOI: 10.1016/j.jtice.2018.12.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Thampy S, Ashburn N, Liu C, Xiong K, Dillon S, Zheng Y, Chabal YJ, Cho K, Hsu JWP. Superior low-temperature NO catalytic performance of PrMn 2O 5 over SmMn 2O 5 mullite-type catalysts. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00490d] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PrMn2O5 is demonstrated as a superior catalyst compared to SmMn2O5 for low temperature NO oxidation, both experimentally and theoretically.
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Affiliation(s)
- Sampreetha Thampy
- Department of Materials Science & Engineering
- University of Texas at Dallas
- Richardson
- USA
| | - Nickolas Ashburn
- Department of Materials Science & Engineering
- University of Texas at Dallas
- Richardson
- USA
| | - Chengfa Liu
- Dongguan Innovative New Materials Co. Ltd
- Dongguan
- China
| | - Ka Xiong
- Dongguan Innovative New Materials Co. Ltd
- Dongguan
- China
| | - Sean Dillon
- Department of Materials Science & Engineering
- University of Texas at Dallas
- Richardson
- USA
| | - Yongping Zheng
- Department of Materials Science & Engineering
- University of Texas at Dallas
- Richardson
- USA
| | - Yves J. Chabal
- Department of Materials Science & Engineering
- University of Texas at Dallas
- Richardson
- USA
| | - Kyeongjae Cho
- Department of Materials Science & Engineering
- University of Texas at Dallas
- Richardson
- USA
| | - Julia W. P. Hsu
- Department of Materials Science & Engineering
- University of Texas at Dallas
- Richardson
- USA
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16
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Moliner M, Corma A. From metal-supported oxides to well-defined metal site zeolites: the next generation of passive NOxadsorbers for low-temperature control of emissions from diesel engines. REACT CHEM ENG 2019. [DOI: 10.1039/c8re00193f] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Passive NOxadsorbers as new components to complement SCR catalysts to control cold-start NOxemissions efficiently.
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Affiliation(s)
- Manuel Moliner
- Instituto de Tecnología Química
- Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas
- 46022 València
- Spain
| | - Avelino Corma
- Instituto de Tecnología Química
- Universitat Politècnica de València-Consejo Superior de Investigaciones Científicas
- 46022 València
- Spain
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17
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Novel Mn–Cu-Containing CeO2 Nanopolyhedra for the Oxidation of CO and Diesel Soot (Part II): Effect of Oxygen Concentration on the Catalytic Activity. Catal Letters 2018. [DOI: 10.1007/s10562-018-2591-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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18
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Jo JO, Trinh QH, Kim SH, Mok YS. Plasma-catalytic decomposition of nitrous oxide over γ-alumina-supported metal oxides. Catal Today 2018. [DOI: 10.1016/j.cattod.2017.05.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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Consideration of the Role of Plasma in a Plasma-Coupled Selective Catalytic Reduction of Nitrogen Oxides with a Hydrocarbon Reducing Agent. Catalysts 2017. [DOI: 10.3390/catal7110325] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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20
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McCarthy MC, Lee KLK, Stanton JF. Detection and structural characterization of nitrosamide H 2NNO: A central intermediate in deNO x processes. J Chem Phys 2017; 147:134301. [PMID: 28987087 DOI: 10.1063/1.4992097] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
The structure and bonding of H2NNO, the simplest N-nitrosamine, and a key intermediate in deNOx processes, have been precisely characterized using a combination of rotational spectroscopy of its more abundant isotopic species and high-level quantum chemical calculations. Isotopic spectroscopy provides compelling evidence that this species is formed promptly in our discharge expansion via the NH2 + NO reaction and is collisionally cooled prior to subsequent unimolecular rearrangement. H2NNO is found to possess an essentially planar geometry, an NNO angle of 113.67(5)°, and a N-N bond length of 1.342(3) Å; in combination with the derived nitrogen quadrupole coupling constants, its bonding is best described as an admixture of uncharged dipolar (H2N-N=O, single bond) and zwitterion (H2N+=N-O-, double bond) structures. At the CCSD(T) level, and extrapolating to the complete basis set limit, the planar geometry appears to represent the minimum of the potential surface, although the torsional potential of this molecule is extremely flat.
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Affiliation(s)
- Michael C McCarthy
- Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA and School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, Massachusetts 02138, USA
| | - Kin Long Kelvin Lee
- Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA and School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, Massachusetts 02138, USA
| | - John F Stanton
- Department of Chemistry and Biochemistry, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712-0165, USA
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More PM. Effect of active component addition and support modification on catalytic activity of Ag/Al 2O 3 for the selective catalytic reduction of NOx by hydrocarbon - A review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2017; 188:43-48. [PMID: 27930954 DOI: 10.1016/j.jenvman.2016.11.077] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 11/14/2016] [Accepted: 11/29/2016] [Indexed: 06/06/2023]
Abstract
The effect of active component addition and support modification of Ag/Al2O3 has been reviewed to examine their contribution to HC-SCR of NOx. This review has depicted the possible mechanisms of reduction of NO by hydrocarbon using metal/metal oxide doped Ag/Al2O3. The addition of second metal results in the maximum formation of well dispersed Agnδ+ clusters. Specifically, addition of Au improves the low-temperature activity of the catalyst. However, the role of second metal also depends on the pretreatment to the catalyst and nature of the reductants. The support modification of Ag/Al2O3 by the addition of different metal oxides has also been reviewed. Modification by MgO showed improvement in activity besides sulfur tolerance. In situ DRIFT study demonstrates that the modification by MgO leads to the inhibition of sulfate formation of Ag and Al2O3. Enhancement in activity after second metal addition and support modification attributed to the synergistic effect and improved surface properties of Ag/Al2O3 catalyst.
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Affiliation(s)
- Pavan M More
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Marg, Matunga, Mumbai- 400019, India.
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