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Yao D, Hu X, Wu F, Li X, Li Y. Hydrothermal Aging Mechanism and Modeling for SCR Catalysts. ACS OMEGA 2023; 8:2421-2434. [PMID: 36687040 PMCID: PMC9851035 DOI: 10.1021/acsomega.2c06902] [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: 10/26/2022] [Accepted: 12/16/2022] [Indexed: 06/17/2023]
Abstract
Based on the activity evaluation and characterization test, we explored the hydrothermal aging mechanism of a vanadium-based SCR catalyst and constructed a dual-site hydrothermal aging kinetic model in this study. The vanadium-based catalyst contains Brønsted acidic sites and Lewis acidic sites, which show different sensitivities to hydrothermal aging, and the reduction of active sites is the main reason for the NOx conversion efficiency reduction after hydrothermal aging. The ammonia storage capacities of both sites have a high correlation coefficient with the NOx conversion efficiency. Based on the method of NH3-TPD curve peak resolution, we quantified the transformations of the two active sites and established the relationship between the site density, the aging temperature, and the duration to determine the aging factor. Then, a hydrothermal aging kinetic model was constructed, and the parameter identification and verification of the model were carried out through flow reactor experiments. The results show that the model constructed in this study can accurately reflect the catalyst activity after hydrothermal aging.
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Affiliation(s)
- Dongwei Yao
- College
of Energy Engineering, Zhejiang University, Hangzhou310027, China
- Key
Laboratory of Smart Thermal Management Science & Technology for
Vehicles of Zhejiang Province, Taizhou317200, China
| | - Xiaohan Hu
- College
of Energy Engineering, Zhejiang University, Hangzhou310027, China
| | - Feng Wu
- College
of Energy Engineering, Zhejiang University, Hangzhou310027, China
| | - Xingwen Li
- College
of Energy Engineering, Zhejiang University, Hangzhou310027, China
| | - Yuxi Li
- College
of Energy Engineering, Zhejiang University, Hangzhou310027, China
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2
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Ullah S, Ferreira-Neto EP, Khan AA, Medeiros IPM, Wender H. Supported nanostructured photocatalysts: the role of support-photocatalyst interactions. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES : OFFICIAL JOURNAL OF THE EUROPEAN PHOTOCHEMISTRY ASSOCIATION AND THE EUROPEAN SOCIETY FOR PHOTOBIOLOGY 2023; 22:219-240. [PMID: 36178668 DOI: 10.1007/s43630-022-00299-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 09/05/2022] [Indexed: 01/12/2023]
Abstract
Heterogeneous photocatalysis employing semiconductor oxide photocatalysts is a sustainable and promising method for environmental remediation and clean energy generation. In this context, nanostructured photocatalysts, with at least one dimension in the 1‒100 nm size regime, have attracted ever-growing attention due to their unique and often enhanced size-dependent physicochemical properties. While their reduced size ensures enhanced photocatalytic performance, the same makes it difficult and time/energy-demanding to remove/recover such nanostructured photocatalysts from aqueous media. This fundamental limitation has paved the way towards developing supported nanophotocatalysts where the active photocatalytic nanostructures are coated on the surface of polymeric or inorganic support materials, often in a core@shell conformation. This arrangement solves the problem of photocatalysts' recovery for effective reuse or recycling and leads to improved and desired target properties due to specific photocatalyst-support interactions. While the enhanced physicochemical properties of supported photocatalysts have been widely studied in many target applications, the role of support-photocatalysts interactions in improving these properties remains unexplored. This review article provides an updated viewpoint on the photocatalyst-support interactions and the resulting unique physiochemical properties important for diverse photochemical applications and the design of practical devices. While exploring the properties of supported nanostructured metal oxide/sulfides photocatalysts such as TiO2 and MoS2, we also briefly discuss the common strategies employed to coat the active nanomaterials on the surface of different supports (organic/polymeric, inorganic, active, inert, and magnetic).
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Affiliation(s)
- Sajjad Ullah
- Institute of Chemical Sciences, University of Peshawar, PO Box 25120, Peshawar, Pakistan.
| | - Elias P Ferreira-Neto
- Department of Chemistry, Federal University of Santa Catarina (UFSC), Florianópolis, Santa Catarina, 88040-900, Brazil
| | - Abrar A Khan
- Institute of Chemical Sciences, University of Peshawar, PO Box 25120, Peshawar, Pakistan
| | - Isaac P M Medeiros
- Nano & Photon Research Group, Laboratory of Nanomaterials and Applied Nanotechnology (LNNA), Institute of Physics, Federal University of Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul, 79070-900, Brazil
| | - Heberton Wender
- Nano & Photon Research Group, Laboratory of Nanomaterials and Applied Nanotechnology (LNNA), Institute of Physics, Federal University of Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul, 79070-900, Brazil.
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3
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Study on the Mechanism of SO2 Poisoning of MnOx/PG for Lower Temperature SCR by Simple Washing Regeneration. Catalysts 2021. [DOI: 10.3390/catal11111360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Manganese oxide-supported palygorskite (MnOx/PG) catalysts are considered highly efficient for low-temperature SCR of NOx. However, the MnOx/PG catalyst tends to be poisoned by SO2. The effect of SO2 on activity of the SO2-pretreated poisoning catalysts under ammonia-free conditions was explored. It was determined that the MnOx/PG catalyst tends to be considerably deactivated by SO2 in the absence of ammonia and that water-washed regeneration can completely recover activity of the deactivated catalyst. Based on these results and characterizations of the catalysts, a reasonable mechanism for the deactivation of MnOx/PG catalyst by SO2 was proposed in this study. SO2 easily oxidized to SO3 on the surface of the catalyst, leading to the formation of polysulfuric acid, wrapping of the active component and blocking the micropores. The deactivation of the MnOx/PG catalyst is initially caused by the formation of polysulfuric rather than the deposition of ammonia sulfate, which occurs later.
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Feng X, Wei K, Zhang Y, Liu Z, Chen Y. Enhanced Durability of Monolithic V 2O 5–WO 3/TiO 2 Catalysts Prepared by a Novel One-Pot Method for the Selective Catalytic Reduction of NO x with NH 3. JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 2021. [DOI: 10.1252/jcej.20we236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xi Feng
- Sinocat Environmental Technology Co., Ltd
| | - Kuan Wei
- Sinocat Environmental Technology Co., Ltd
| | | | - Zhimin Liu
- Sinocat Environmental Technology Co., Ltd
| | - Yaoqiang Chen
- Key Laboratory of Green Chemistry and Technology of the Ministry of Education, College of Chemistry, Sichuan University
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5
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Abstract
This review aims to give a general overview of the recent use of tungsten-based catalysts for wide environmental applications, with first some useful background information about tungsten oxides. Tungsten oxide materials exhibit suitable behaviors for surface reactions and catalysis such as acidic properties (mainly Brønsted sites), redox and adsorption properties (due to the presence of oxygen vacancies) and a photostimulation response under visible light (2.6–2.8 eV bandgap). Depending on the operating condition of the catalytic process, each of these behaviors is tunable by controlling structure and morphology (e.g., nanoplates, nanosheets, nanorods, nanowires, nanomesh, microflowers, hollow nanospheres) and/or interactions with other compounds such as conductors (carbon), semiconductors or other oxides (e.g., TiO2) and precious metals. WOx particles can be also dispersed on high specific surface area supports. Based on these behaviors, WO3-based catalysts were developed for numerous environmental applications. This review is divided into five main parts: structure of tungsten-based catalysts, acidity of supported tungsten oxide catalysts, WO3 catalysts for DeNOx applications, total oxidation of volatile organic compounds in gas phase and gas sensors and pollutant remediation in liquid phase (photocatalysis).
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6
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Kuma R, Kitano T, Tsujiguchi T, Tanaka T. In Situ XANES Characterization of V 2O 5/TiO 2–SiO 2–MoO 3 Catalyst for Selective Catalytic Reduction of NO by NH 3. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c02308] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ryoji Kuma
- New Energy Materials Research Department, Nippon Shokubai Company Ltd., Himeji, Hyogo 671-1292, Japan
| | - Tomoyuki Kitano
- Analysis Technology Center, Nippon Shokubai Company Ltd., Suita, Osaka 564-0034, Japan
| | - Takuya Tsujiguchi
- New Energy Materials Research Department, Nippon Shokubai Company Ltd., Himeji, Hyogo 671-1292, Japan
| | - Tsunehiro Tanaka
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto 615-8510, Japan
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7
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Li X, Yao D, Wu F, Wang X, Wei L, Liu B. New Findings in Hydrothermal Deactivation Research on the Vanadia-Selective Catalytic Reduction Catalyst. ACS OMEGA 2019; 4:5088-5097. [PMID: 31459686 PMCID: PMC6648397 DOI: 10.1021/acsomega.8b03572] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 02/20/2019] [Indexed: 06/10/2023]
Abstract
Considering the risks of hydrothermal deterioration in vehicles, power plants, and oceangoing vessels, V2O5-WO3/TiO2 catalysts were subject to hydrothermal and thermal aging at 600, 625, 635, and 650 °C for 4-48 h. The different ratio and significant loss of active sites are main reasons for catalyst deactivation. Both Lewis and Brønsted acid sites are involved in the selective catalytic reduction reaction. Brønsted acid sites are more susceptible. High temperature plays a major role in the aging. It causes sintering, particle growth, and the anatase phase transition. Phase transformation turns out to be less important than sintering. Sintering leads to the reduction of the BET surface area, which in turn causes decrease of NH3 adsorption amount and changes of active sites. Aging time can accelerate the degree of deactivation. It also helps to change the proportion of active sites. Water vapor has no significant effect on NO X conversion rates.
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Affiliation(s)
- Xingwen Li
- Institute
of Power Machinery and Vehicular Engineering, College of Energy Engineering, Zhejiang University, Zheda Road 38, Xihu District, Hangzhou 310027, China
| | - Dongwei Yao
- Institute
of Power Machinery and Vehicular Engineering, College of Energy Engineering, Zhejiang University, Zheda Road 38, Xihu District, Hangzhou 310027, China
| | - Feng Wu
- Institute
of Power Machinery and Vehicular Engineering, College of Energy Engineering, Zhejiang University, Zheda Road 38, Xihu District, Hangzhou 310027, China
| | - Xinlei Wang
- Agricultural
Engr Sciences, Bld 1304
W. Pennsylvania, Urbana, Illinois 61801, United
States
| | - Lai Wei
- Institute
of Power Machinery and Vehicular Engineering, College of Energy Engineering, Zhejiang University, Zheda Road 38, Xihu District, Hangzhou 310027, China
| | - Biao Liu
- Institute
of Power Machinery and Vehicular Engineering, College of Energy Engineering, Zhejiang University, Zheda Road 38, Xihu District, Hangzhou 310027, China
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8
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Effect of SiO2 on co-impregnated V2O5/WO3/TiO2 catalysts for the selective catalytic reduction of NO with NH3. Catal Today 2019. [DOI: 10.1016/j.cattod.2017.11.037] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Liu X, Chen H, Wu X, Cao L, Jiang P, Yu Q, Ma Y. Effects of SiO2 modification on the hydrothermal stability of the V2O5/WO3–TiO2 NH3-SCR catalyst: TiO2 structure and vanadia species. Catal Sci Technol 2019. [DOI: 10.1039/c9cy00385a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The addition of silica could produce the SixTi1−xO2 solid solutions at the interface in the doped catalyst, which inhibit the direct contact among anatase crystals and improve the stable textural property of V2O5/WO3–TiO2 catalyst.
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Affiliation(s)
- Xuesong Liu
- College of Chemistry and Chemical Engineering
- Shaoxing University
- Zhejiang 312000
- PR China
- Key Laboratory of Advanced Materials of Ministry of Education
| | - Hongfeng Chen
- Shaoxing Testing Institute of Quality and Technical Supervision
- Shaoxing
- China
| | - Xiaodong Wu
- Key Laboratory of Advanced Materials of Ministry of Education
- School of Materials Science and Engineering
- Tsinghua University
- Beijing 100084
- PR China
| | - Li Cao
- Key Laboratory of Advanced Materials of Ministry of Education
- School of Materials Science and Engineering
- Tsinghua University
- Beijing 100084
- PR China
| | - Peng Jiang
- College of Chemistry and Chemical Engineering
- Shaoxing University
- Zhejiang 312000
- PR China
| | - Qifan Yu
- College of Chemistry and Chemical Engineering
- Shaoxing University
- Zhejiang 312000
- PR China
| | - Yue Ma
- Key Laboratory of Advanced Materials of Ministry of Education
- School of Materials Science and Engineering
- Tsinghua University
- Beijing 100084
- PR China
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10
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A close-up to the promoting effect of tungsten in Ce/TiO 2 catalysts for the selective catalytic reduction of NO with NH 3. MOLECULAR CATALYSIS 2018. [DOI: 10.1016/j.mcat.2017.10.032] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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11
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Greenaway AG, Lezcano-Gonzalez I, Agote-Aran M, Gibson EK, Odarchenko Y, Beale AM. Operando Spectroscopic Studies of Cu-SSZ-13 for NH 3-SCR deNOx Investigates the Role of NH 3 in Observed Cu(II) Reduction at High NO Conversions. Top Catal 2018; 61:175-182. [PMID: 30956504 PMCID: PMC6413821 DOI: 10.1007/s11244-018-0888-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The small pore zeolite chabazite (SSZ-13) in the copper exchanged form is a very efficient material for the selective catalytic reduction by ammonia (NH3) of nitrogen oxides (NOx) from the exhaust of lean burn engines, typically diesel powered vehicles. The full mechanism occurring during the NH3–SCR process is currently debated with outstanding questions including the nature and role of the catalytically active sites. Time-resolved operando spectroscopic techniques have been used to provide new level of insights in to the mechanism of NH3–SCR, to show that the origin of stable Cu(I) species under SCR conditions is potentially caused by an interaction between NH3 and the Cu cations located in eight ring sites of the bulk of the zeolite and is independent of the NH3–SCR of NOx occurring at Cu six ring sites within the zeolite.
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Affiliation(s)
- Alex G Greenaway
- 1Department of Chemistry, UCL, 20 Gordon Street, London, WC1H 0AJ UK.,2Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, OX11 0FA UK
| | - Ines Lezcano-Gonzalez
- 1Department of Chemistry, UCL, 20 Gordon Street, London, WC1H 0AJ UK.,2Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, OX11 0FA UK
| | - Miren Agote-Aran
- 1Department of Chemistry, UCL, 20 Gordon Street, London, WC1H 0AJ UK.,2Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, OX11 0FA UK
| | - Emma K Gibson
- 1Department of Chemistry, UCL, 20 Gordon Street, London, WC1H 0AJ UK.,2Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, OX11 0FA UK
| | - Yaroslav Odarchenko
- 1Department of Chemistry, UCL, 20 Gordon Street, London, WC1H 0AJ UK.,2Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, OX11 0FA UK
| | - Andrew M Beale
- 1Department of Chemistry, UCL, 20 Gordon Street, London, WC1H 0AJ UK.,2Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, OX11 0FA UK
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12
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Mao Y, Wang Z, Wang HF, Hu P. Understanding Catalytic Reactions over Zeolites: A Density Functional Theory Study of Selective Catalytic Reduction of NOx by NH3 over Cu-SAPO-34. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01449] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yu Mao
- Key
Laboratory for Advanced Materials, Centre for Computational Chemistry
and Research Institute of Industrial Catalysis, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People’s Republic of China
- School
of Chemistry and Chemical Engineering, The Queen’s University of Belfast, Belfast BT9 5AG, United Kingdom
| | - Ziyun Wang
- School
of Chemistry and Chemical Engineering, The Queen’s University of Belfast, Belfast BT9 5AG, United Kingdom
| | - Hai-Feng Wang
- Key
Laboratory for Advanced Materials, Centre for Computational Chemistry
and Research Institute of Industrial Catalysis, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People’s Republic of China
| | - P. Hu
- Key
Laboratory for Advanced Materials, Centre for Computational Chemistry
and Research Institute of Industrial Catalysis, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, People’s Republic of China
- School
of Chemistry and Chemical Engineering, The Queen’s University of Belfast, Belfast BT9 5AG, United Kingdom
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13
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Modeling and Multi-Objective Optimization of NOx Conversion Efficiency and NH3 Slip for a Diesel Engine. SUSTAINABILITY 2016. [DOI: 10.3390/su8050478] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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14
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VOx Surface Coverage Optimization of V2O5/WO3-TiO2 SCR Catalysts by Variation of the V Loading and by Aging. Catalysts 2015. [DOI: 10.3390/catal5041704] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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15
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Marberger A, Elsener M, Ferri D, Sagar A, Schermanz K, Kröcher O. Generation of NH3 Selective Catalytic Reduction Active Catalysts from Decomposition of Supported FeVO4. ACS Catal 2015. [DOI: 10.1021/acscatal.5b00738] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Adrian Marberger
- Paul Scherrer Institut, CH-5232 Villigen, Switzerland
- Institute of Chemical Science and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | | | - Davide Ferri
- Paul Scherrer Institut, CH-5232 Villigen, Switzerland
| | - Amod Sagar
- Department of Chemistry R&D, Treibacher Industrie AG, A-9330 Althofen, Austria
| | - Karl Schermanz
- Department of Chemistry R&D, Treibacher Industrie AG, A-9330 Althofen, Austria
| | - Oliver Kröcher
- Paul Scherrer Institut, CH-5232 Villigen, Switzerland
- Institute of Chemical Science and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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