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Borchers M, Lott P, Deutschmann O. Selective Catalytic Reduction with Hydrogen for Exhaust gas after-treatment of Hydrogen Combustion Engines. Top Catal 2022. [DOI: 10.1007/s11244-022-01723-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
AbstractIn this work, two palladium-based catalysts with either ZSM-5 or Zeolite Y as support material are tested for their performance in selective catalytic reduction of NOx with hydrogen (H2-SCR). The ligh-toff measurements in synthetic exhaust gas mixtures typical for hydrogen combustion engines are supplemented by detailed catalyst characterization comprising N2 physisorption, X-ray powder diffraction (XRD), hydrogen temperature programmed reduction (H2-TPR) and ammonia temperature programmed desorption (NH3-TPD). Introducing 10% or 20% TiO2 into the catalyst formulations reduced the surface area and the number of acidic sites for both catalysts, however, more severely for the Zeolite Y-supported catalysts. The higher reducibility of the Pd particles that was uncovered by H2-TPR resulted in an improved catalytic performance during the light-off measurements and substantially boosted NO conversion. Upon exposition to humid exhaust gas, the ZSM-5-supported catalysts showed a significant drop in performance, whereas the Zeolite Y-supported catalyst kept the high levels of conversion while shifting the selectivity from N2O more toward NH3 and N2. The 1%Pd/20%TiO2/HY catalyst subject to this work outperforms one of the most active and selective benchmark catalyst formulations, 1%Pd/5%V2O5/20%TiO2-Al2O3, making Zeolite Y a promising support material for H2-SCR catalyst formulations that allow efficient and selective NOx-removal from exhaust gases originating from hydrogen-fueled engines.
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Microkinetic Modeling of the Oxidation of Methane Over PdO Catalysts—Towards a Better Understanding of the Water Inhibition Effect. Catalysts 2020. [DOI: 10.3390/catal10080922] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Water, which is an intrinsic part of the exhaust gas of combustion engines, strongly inhibits the methane oxidation reaction over palladium oxide-based catalysts under lean conditions and leads to severe catalyst deactivation. In this combined experimental and modeling work, we approach this challenge with kinetic measurements in flow reactors and a microkinetic model, respectively. We propose a mechanism that takes the instantaneous impact of water on the noble metal particles into account. The dual site microkinetic model is based on the mean-field approximation and consists of 39 reversible surface reactions among 23 surface species, 15 related to Pd-sites, and eight associated with the oxide. A variable number of available catalytically active sites is used to describe light-off activity tests as well as spatially resolved concentration profiles. The total oxidation of methane is studied at atmospheric pressure, with space velocities of 160,000 h−1 in the temperature range of 500–800 K for mixtures of methane in the presence of excess oxygen and up to 15% water, which are typical conditions occurring in the exhaust of lean-operated natural gas engines. The new approach presented is also of interest for modeling catalytic reactors showing a dynamic behavior of the catalytically active particles in general.
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Lott P, Dolcet P, Casapu M, Grunwaldt JD, Deutschmann O. The Effect of Prereduction on the Performance of Pd/Al2O3 and Pd/CeO2 Catalysts during Methane Oxidation. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b01267] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Patrick Lott
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, Karlsruhe, 76131, Germany
| | - Paolo Dolcet
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, Karlsruhe, 76131, Germany
| | - Maria Casapu
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, Karlsruhe, 76131, Germany
| | - Jan-Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, Karlsruhe, 76131, Germany
| | - Olaf Deutschmann
- Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT), Engesserstraße 20, Karlsruhe, 76131, Germany
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Monoliths: A Review of the Basics, Preparation Methods and Their Relevance to Oxidation. Catalysts 2017. [DOI: 10.3390/catal7020062] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Stainless steel grid mesh-supported CVD made Co3O4 thin films for catalytic oxidation of VOCs of olefins type at low temperature. J IND ENG CHEM 2016. [DOI: 10.1016/j.jiec.2015.12.039] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Montebelli A, Visconti CG, Groppi G, Tronconi E, Cristiani C, Ferreira C, Kohler S. Methods for the catalytic activation of metallic structured substrates. Catal Sci Technol 2014. [DOI: 10.1039/c4cy00179f] [Citation(s) in RCA: 101] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The review addresses the methods for depositing catalytic layers onto metallic structured substrates, specifically focusing on honeycomb monoliths and open-cell foams.
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Affiliation(s)
| | | | | | - Enrico Tronconi
- Politecnico di Milano
- Dipartimento di Energia
- 20133 Milano, Italy
| | - Cinzia Cristiani
- Politecnico di Milano
- Dipartimento di Chimica
- Materiali e Ingegneria Chimica “G. Natta”
- 20133 Milano, Italy
| | - Cristina Ferreira
- Total New Energies
- 24 cours Michelet – La Défense 10
- 92069 Paris La Défense, France
| | - Stefanie Kohler
- Total Refining & Chemicals
- 2 place Jean Millier – La Défense 6
- 92078 Paris La Défense Cedex, France
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Beretta A, Donazzi A, Groppi G, Maestri M, Tronconi E, Forzatti P. Gaining insight into the kinetics of partial oxidation of light hydrocarbons on Rh, through a multiscale methodology based on advanced experimental and modeling techniques. CATALYSIS 2013. [DOI: 10.1039/9781849737203-00001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
This chapter updates previous reviews on the catalytic partial oxidation of methane and light hydrocarbons over noble metals; specifically, it focuses on the development of experimental and modeling tools that in recent years allowed to measure with accuracy and formalize the kinetics of the surface process, thus setting the basis for the engineering of short contact time CPO reformers. Such advanced tools include special micro-reactor designs for the kinetic investigation under isothermal conditions, first-principle microkinetic schemes, techniques for the spatially resolved measurement of temperature and concentration profiles inside working adiabatic reactors, detailed reactor models accounting for the role of transport phenomena in structured catalysts as well as that of homogeneous reactions. These contributions pave a multi-scale path, that runs from the fundamentals of surface kinetics to the reactor optimal design.
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Affiliation(s)
- A. Beretta
- Laboratory of Catalysis and Catalytic Processes Dipartimento di Energia, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano
| | - A. Donazzi
- Laboratory of Catalysis and Catalytic Processes Dipartimento di Energia, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano
| | - G. Groppi
- Laboratory of Catalysis and Catalytic Processes Dipartimento di Energia, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano
| | - M. Maestri
- Laboratory of Catalysis and Catalytic Processes Dipartimento di Energia, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano
| | - E. Tronconi
- Laboratory of Catalysis and Catalytic Processes Dipartimento di Energia, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano
| | - P. Forzatti
- Laboratory of Catalysis and Catalytic Processes Dipartimento di Energia, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano
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Di Benedetto A, Landi G, Di Sarli V, Barbato P, Pirone R, Russo G. Methane catalytic combustion under pressure. Catal Today 2012. [DOI: 10.1016/j.cattod.2012.08.032] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Snapkauskienė V, Valinčius V, Valatkevičius P. Experimental study of catalytic CO oxidation over CuO/Al2O3 deposited on metal sheets. Catal Today 2011. [DOI: 10.1016/j.cattod.2011.02.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Essakhi A, Mutel B, Supiot P, Löfberg A, Paul S, Courtois VL, Meille V, Pitault I, Bordes-Richard E. Coating of structured catalytic reactors by plasma assisted polymerization of tetramethyldisiloxane. POLYM ENG SCI 2011. [DOI: 10.1002/pen.21899] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Mohino F, Avila P, Salerno P, Bahamonde A, Mendioroz S. PILC-based monolithic catalysts for the selective catalytic reduction of nitrogen oxides by methane in oxygen excess. Catal Today 2005. [DOI: 10.1016/j.cattod.2005.07.090] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Effect of ageing time on chemical and rheological evolution in γ-Al2O3 slurries for dip-coating. Catal Today 2005. [DOI: 10.1016/j.cattod.2005.06.020] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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