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Liu S, Huang Y, Li S, Lin Q, Wang J, Xie S, Liu F, Xu H, Chen Y. Unique κ-Ce 2Zr 2O 8 Superstructure Promoting the NO x Adsorption-Selective Catalytic Reduction (AdSCR) Performance of the WO 3/CeZrO x Catalyst. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:16685-16694. [PMID: 37864569 DOI: 10.1021/acs.est.3c05384] [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: 10/23/2023]
Abstract
Selective catalytic reduction of NOx by NH3 (NH3-SCR) for diesel emission control at low temperatures is still a great challenge due to the limit of the urea injection threshold and inferior SCR activity of state-of-the-art catalyst systems below 200 °C. Fabricating bifunctional catalysts with both low temperature NOx adsorption-storage capacity and medium-high temperature NOx reduction activity is an effective strategy to solve the issues mentioned above but is rarely investigated. Herein, the WO3/Ce0.68Zr0.32Ox (W/CZ) catalyst containing the κ-Ce2Zr2O8 pyrochlore structure was successfully developed by a simple H2 reduction method, not only showing superior NOx adsorption-storage ability below 180 °C but also exhibiting excellent NH3-SCR activity above 180 °C. The presence of the pyrochlore structure effectively increased the oxygen vacancies on the κ-Ce2Zr2O8-containing W/CZ catalyst with enhanced redox property, which significantly promoted the NOx adsorption-storage as active nitrate species below 180 °C. Upon NH3 introduction above 180 °C, the κ-Ce2Zr2O8-containing W/CZ catalyst showed greatly improved NOx reduction performance, suggesting that the pyrochlore structure played a vital role in improving the NOx adsorption-selective catalytic reduction (AdSCR) performance. This work provides a new perspective for designing bifunctional CeZrOx-based catalysts to efficiently control the NOx emissions from diesel engines during the cold-start process.
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Affiliation(s)
- Shuang Liu
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, Sichuan, China
- Sichuan Provincial Environmental Protection Environmental Catalytic Materials Engineering Technology Center, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China
| | - Yan Huang
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, Sichuan, China
| | - Shanshan Li
- Sichuan Provincial Environmental Protection Environmental Catalytic Materials Engineering Technology Center, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China
| | - Qingjin Lin
- State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu, 610064 Sichuan, China
| | - Jianli Wang
- Sichuan Provincial Environmental Protection Environmental Catalytic Materials Engineering Technology Center, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China
| | - Shaohua Xie
- Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), Nano Science Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States
| | - Fudong Liu
- Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), Nano Science Technology Center (NSTC), University of Central Florida, Orlando, Florida 32816, United States
| | - Haidi Xu
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, Sichuan, China
- Sichuan Provincial Environmental Protection Environmental Catalytic Materials Engineering Technology Center, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China
| | - Yaoqiang Chen
- Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, Sichuan, China
- Sichuan Provincial Environmental Protection Environmental Catalytic Materials Engineering Technology Center, College of Chemistry, Sichuan University, Chengdu 610064, Sichuan, China
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2
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Huang S, Shan Y, Shi X, Liu Z, Wang Q, He H. A Study of CeSnO x and Pd/CeSnO x as Low-Temperature NO x Adsorbers with Excellent Hydrothermal Stability. ACS OMEGA 2023; 8:30859-30867. [PMID: 37663454 PMCID: PMC10468927 DOI: 10.1021/acsomega.3c00841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 08/03/2023] [Indexed: 09/05/2023]
Abstract
In the present work, we report on two passive NOx adsorber (PNA) material candidates: the novel support CeSnOx with and without Pd loading. The NOx adsorption and storage capacities of fresh and hydrothermally aged CeSnOx and Pd/CeSnOx were investigated. The results show that CeSnOx exhibits a rather large NOx uptake and storage capacity (28.9 μmol/g), while the loading of Pd on CeSnOx can further increase the storage capacity to 37.6 μmol/g and affect the desorption temperature of NOx. It was found that the NOx desorption temperature of Pd/CeSnOx was compatible with the efficient operating window of selective catalytic reduction (SCR) catalysts. After a hydrothermal aging treatment at 800 °C for 12 h, the NOx adsorption and storage capacities of CeSnOx and Pd/CeSnOx increased, indicating excellent hydrothermal stability. The interaction of Pd with CeSnOx, the state of Pd species, and the structure of CeSnOx and Pd/CeSnOx are studied by combination of the characterization results.
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Affiliation(s)
- Shasha Huang
- State
Key Joint Laboratory of Environment Simulation and Pollution Control,
Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- Beijing
Key Lab for Source Control Technology of Water Pollution, College
of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
- Engineering
Research Center for Water Pollution Source Control & Eco-remediation,
College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Yulong Shan
- State
Key Joint Laboratory of Environment Simulation and Pollution Control,
Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaoyan Shi
- State
Key Joint Laboratory of Environment Simulation and Pollution Control,
Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhongqi Liu
- State
Key Joint Laboratory of Environment Simulation and Pollution Control,
Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
| | - Qiang Wang
- Beijing
Key Lab for Source Control Technology of Water Pollution, College
of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
- Engineering
Research Center for Water Pollution Source Control & Eco-remediation,
College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Hong He
- State
Key Joint Laboratory of Environment Simulation and Pollution Control,
Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
- Center
for Excellence in Regional Atmospheric Environment. Institute of Urban
Environment. Chinese Academy of Sciences, Xiamen 361021, China
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3
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Huang S, Wang Q, Shan Y, Shi X, Liu Z, He H. Effects of Si/Al Ratio on Passive NO x Adsorption Performance over Pd/Beta Zeolites. Molecules 2023; 28:molecules28083501. [PMID: 37110735 PMCID: PMC10145102 DOI: 10.3390/molecules28083501] [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: 03/21/2023] [Revised: 04/07/2023] [Accepted: 04/13/2023] [Indexed: 04/29/2023] Open
Abstract
In the current article, the effect of Si/Al ratio on the NOx adsorption and storage capacity over Pd/Beta with 1 wt% Pd loading was investigated. The XRD, 27Al NMR and 29Si NMR measurements were used to determine the structure of Pd/Beta zeolites. XAFS, XPS, CO-DRIFT, TEM and H2-TPR were used to identify the Pd species. The results showed that the NOx adsorption and storage capacity on Pd/Beta zeolites gradually decreased with the increase of Si/Al ratio. Pd/Beta-Si (Si-rich, Si/Al~260) rarely has NOx adsorption and storage capacity, while Pd/Beta-Al (Al-rich, Si/Al~6) and Pd/Beta-C (Common, Si/Al~25) exhibit excellent NOx adsorption and storage capacity and suitable desorption temperature. Pd/Beta-C has slightly lower desorption temperature compared to Pd/Beta-Al. The NOx adsorption and storage capacity increased for Pd/Beta-Al and Pd/Beta-C by hydrothermal aging treatment, while the NOx adsorption and storage capacity on Pd/Beta-Si had no change.
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Affiliation(s)
- Shasha Huang
- Beijing Key Laboratory for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
- Engineering Research Center for Water Pollution Source Control & Eco-Remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Qiang Wang
- Beijing Key Laboratory for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
- Engineering Research Center for Water Pollution Source Control & Eco-Remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
| | - Yulong Shan
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaoyan Shi
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhongqi Liu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hong He
- State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
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Liu Z, Guan B, Guo J, Jiang H, Wei Y, Wu X, Lin H, Huang Z. Optimizing the Proportion of Framework Elements and the Distribution of Active Sites in Pd–SSZ-13 for Better Passive NO x Adsorber Performance. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c01132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Ziqian Liu
- Key Laboratory for Power Machine and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Bin Guan
- Key Laboratory for Power Machine and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Jiangfeng Guo
- Key Laboratory for Power Machine and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Han Jiang
- Key Laboratory for Power Machine and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Yanfei Wei
- Key Laboratory for Power Machine and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xingze Wu
- Key Laboratory for Power Machine and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
| | - He Lin
- Key Laboratory for Power Machine and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Zhen Huang
- Key Laboratory for Power Machine and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China
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6
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Recent progress of Pd/zeolite as passive NOx adsorber: Adsorption chemistry, structure-performance relationships, challenges and prospects. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2021.07.066] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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7
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Toso A, Danielis M, de Leitenburg C, Boaro M, Trovarelli A, Colussi S. Key Properties and Parameters of Pd/CeO2 Passive NOx Adsorbers. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.1c04805] [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)
- Alessandra Toso
- Dipartimento Politecnico and INSTM, Università di Udine, via del Cotonificio 108, 33100 Udine, Italy
| | - Maila Danielis
- Dipartimento Politecnico and INSTM, Università di Udine, via del Cotonificio 108, 33100 Udine, Italy
| | - Carla de Leitenburg
- Dipartimento Politecnico and INSTM, Università di Udine, via del Cotonificio 108, 33100 Udine, Italy
| | - Marta Boaro
- Dipartimento Politecnico and INSTM, Università di Udine, via del Cotonificio 108, 33100 Udine, Italy
| | - Alessandro Trovarelli
- Dipartimento Politecnico and INSTM, Università di Udine, via del Cotonificio 108, 33100 Udine, Italy
| | - Sara Colussi
- Dipartimento Politecnico and INSTM, Università di Udine, via del Cotonificio 108, 33100 Udine, Italy
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Abstract
The passive NOx adsorber (PNA) material has been considered an effective candidate for the control of NOx from diesel exhaust during the engine cold start stage, and Pd/SSZ-13 attracts peoples’ attention mainly due to its superior hydrothermal stability and sulfur resistance. However, chemical poisoning tolerance of Pd/SSZ-13 is another key parameter to its practical application and future development. Herein, we prepared potassium-loaded Pd/SSZ-13 and evaluated the influence on NOx adsorption ability. The characterization results revealed that the loading of potassium could not destruct the structure of SSZ-13 but impaired the BET surface area and pore structure through the sintering of Pd species to PdO. Meanwhile, the grown PdO phase restrained the NOx adsorption ability and promoted the generation of NO2 at high temperatures. Moreover, the presence of H2O could also impair the NOx adsorption ability due to the competitive adsorption between H2O and NOx. This work verifies that the design of Pd/SSZ-13 sample with stable Pd species and excellent hydrophobicity is significant for its further application under harsh conditions.
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Paz Herrera LI, Freitas de Lima e Freitas L, Hong J, Hoffman AS, Bare SR, Nikolla E, Medlin W. Reactivity of Pd-MO2 encapsulated catalytic systems for CO oxidation. Catal Sci Technol 2022. [DOI: 10.1039/d1cy01916c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, we present an investigation aimed at characterizing and understanding the synergistic interactions in encapsulated catalytic structures between the metal core (i.e., Pd) and oxide shell (i.e., TiO2,...
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Filtschew A, Beato P, Rasmussen SB, Hess C. The role of platinum on the NO x storage and desorption behavior of ceria: an online FT-IR study combined with in situ Raman and UV-vis spectroscopy. Phys Chem Chem Phys 2021; 23:1874-1887. [PMID: 33448274 DOI: 10.1039/d0cp05800a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The role of platinum on the room temperature NOx storage mechanism and the NOx desorption behavior of ceria was investigated by combining online FT-IR gas-phase analysis with in situ Raman and UV-vis spectroscopy. The type of pretreatment, leading to the presence of different platinum states (Pt0, and mixed Pt0/Pt2+), is shown to have a major effect on the NOx storage and desorption properties. Upon loading of ceria with platinum (1 wt%), NOx storage capacities decrease except for reductively pretreated Pt/CeO2, enabling new reaction pathways via activation of gas-phase oxygen. In the absence of oxygen, NO is reduced by metallic platinum leading to N2O and N2 formation. In situ Raman spectra provide mechanistic information, by monitoring changes in ceria surface and subsurface oxygen, as well as PtOx during NOx storage. In the presence of gas-phase oxygen, NOx storage is related to the consumption of (sub)surface oxygen and PtOx, and proposed to involve NO2 or [NO + O2] intermediates reacting with surface oxygen. The NOx desorption behavior is shown to be strongly related to the stored NOx species. Oxidative pretreatment of ceria resulted in the largest amount of stored nitrates, consistent with NOx being mostly desorbed at elevated temperatures, i.e., within 300-500 °C. Reductive pretreatment and/or addition of platinum significantly increased the fraction of stored nitrite, thereby shifting the main NOx desorption temperature to values <300 °C. Storage and subsequent desorption of NOx in PtOx/CeO2 was associated with PtOx reduction and reoxidation, as monitored by in situ UV-vis and Raman spectra. Through detailed analysis we were able to elucidate the influence of platinum on NOx storage/desorption and demonstrate the participation of different platinum states in room temperature NOx storage, with each platinum state opening a distinct new reaction pathway.
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Affiliation(s)
- Anastasia Filtschew
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie, Technische Universität Darmstadt, Alarich-Weiss-Straße 8, 64287 Darmstadt, Germany.
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Castoldi L, Matarrese R, Morandi S, Ticali P, Lietti L. Low-temperature Pd/FER NOx adsorbers: Operando FT-IR spectroscopy and performance analysis. Catal Today 2021. [DOI: 10.1016/j.cattod.2020.02.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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12
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Wu G, Chen B, Bai Z, Zhao Q, Wang Z, Song C, Guo X, Shi C. Cobalt oxide with flake-like morphology as efficient passive NOx adsorber. CATAL COMMUN 2021. [DOI: 10.1016/j.catcom.2020.106203] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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13
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Recent advances in catalytic automotive emission control: Passive
NO
storage at low temperatures. J CHIN CHEM SOC-TAIP 2020. [DOI: 10.1002/jccs.202000203] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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15
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Zhang Y, Yu Y, Shan W, Lian Z, He H. Effect of support preparation with different concentration precipitant on the NO storage performance of Pt/BaO/CeO2 catalysts. Catal Today 2020. [DOI: 10.1016/j.cattod.2019.03.021] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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CO and hydrocarbon light-off inhibition by pre-adsorbed NOx on Pt/CeO2/Al2O3 and Pd/CeO2/Al2O3 diesel oxidation catalysts. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2019.115201] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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17
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Ryou Y, Lee J, Lee H, Kim CH, Kim DH. Effect of various activation conditions on the low temperature NO adsorption performance of Pd/SSZ-13 passive NOx adsorber. Catal Today 2019. [DOI: 10.1016/j.cattod.2017.11.030] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Effect of sulfur aging and regeneration on low temperature NO adsorption over hydrothermally treated Pd/CeO 2 and Pd/Ce 0.58 Zr 0.42 O 2 catalysts. Catal Today 2017. [DOI: 10.1016/j.cattod.2017.06.035] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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21
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Ji Y, Xu D, Bai S, Graham U, Crocker M, Chen B, Shi C, Harris D, Scapens D, Darab J. Pt- and Pd-Promoted CeO2–ZrO2 for Passive NOx Adsorber Applications. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.6b03793] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yaying Ji
- Center
for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511, United States
| | - Dongyan Xu
- Center
for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511, United States
| | - Shuli Bai
- Center
for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511, United States
| | - Uschi Graham
- Center
for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511, United States
| | - Mark Crocker
- Center
for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511, United States
- Department
of Chemistry, University of Kentucky, Lexington, Kentucky 40506, United States
| | - Bingbing Chen
- Dalian University of Technology, Dalian, CN 116024, P. R. China
| | - Chuan Shi
- Dalian University of Technology, Dalian, CN 116024, P. R. China
| | - Deb Harris
- MEL Chemicals, Manchester, M27 8LS, United Kingdom
| | - Dave Scapens
- MEL Chemicals, Manchester, M27 8LS, United Kingdom
| | - John Darab
- MEL Chemicals
Inc., Flemington, New Jersey 08822, United States
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