Search Results - "Janssens, Ton V.W."

Activation of oxygen on (NH3CuNH3)+ in NH3-SCR over Cu-CHA by Chen, Lin, Falsig, Hanne, Janssens, Ton V.W., Grönbeck, Henrik

“…[Display omitted] •A phase diagram for NH3 solvated Cu-ions is presented.•Direct O2 dissociation is possible on pairs of Cu(NH3)2+ but not on single…”
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Catalyst deactivation by coke formation in microporous and desilicated zeolite H-ZSM-5 during the conversion of methanol to hydrocarbons by Bleken, Francesca Lønstad, Barbera, Katia, Bonino, Francesca, Olsbye, Unni, Lillerud, Karl Petter, Bordiga, Silvia, Beato, Pablo, Janssens, Ton V.W., Svelle, Stian

“…The deactivation behaviors of a regular, commercial ZSM-5 catalyst and its mesoporous, desilicated counterpart have been investigated and compared by…”
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Influence of lattice stability on hydrothermal deactivation of Cu-ZSM-5 and Cu-IM-5 zeolites for selective catalytic reduction of NOx by NH3 by Vennestrøm, Peter N.R., Janssens, Ton V.W., Kustov, Arkady, Grill, Marie, Puig-Molina, Anna, Lundegaard, Lars F., Tiruvalam, Ramchandra R., Concepción, Patricia, Corma, Avelino

“…[Display omitted] •Hydrothermal deactivation depends on stability of Al in the zeolite framework.•Cu–Al clusters are formed during deactivation of Cu-ZSM-5 and…”
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Dynamic CuII/CuI speciation in Cu-CHA catalysts by in situ Diffuse Reflectance UV–vis-NIR spectroscopy by Negri, Chiara, Signorile, Matteo, Porcaro, Natale G., Borfecchia, Elisa, Berlier, Gloria, Janssens, Ton V.W., Bordiga, Silvia

“…Evolution of copper environment in Cu-CHA (Si/Al = 15 and Cu/Al = 0.5) followed by in situ DRS-UV–vis-NIR spectroscopy. Display Omitted •LMCT transitions of…”
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The energies of formation and mobilities of Cu surface species on Cu and ZnO in methanol and water gas shift atmospheres studied by DFT by Rasmussen, Dominik Bjørn, Janssens, Ton V.W., Temel, Burcin, Bligaard, Thomas, Hinnemann, Berit, Helveg, Stig, Sehested, Jens

“…[Display omitted] ► Mobility and stability of Cu surface species studied by DFT on Cu and ZnO surfaces. ► Metal transport is found to occur by CuCO and Cu2HCOO…”
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Impact of SO2-poisoning over the lifetime of a Cu-CHA catalyst for NH3-SCR by Hammershøi, Peter S., Jensen, Anker D., Janssens, Ton V.W.

“…[Display omitted] •Deactivation of Cu-CHA catalysts for NH3-SCR by SO2 occurs fast.•Deactivation by SO2 can be limited to 20% by regeneration at…”
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Reversible and irreversible deactivation of Cu-CHA NH3-SCRcatalysts by SO2 and SO3 by Hammershøi, Peter S., Jangjou, Yasser, Epling, William S., Jensen, Anker D., Janssens, Ton V.W.

“…[Display omitted] •SOx-poisoned Cu-CHA is partially regenerated by heating to 550 °C.•The irreversible part of deactivation scales with S/Cu ratio; reversible…”
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Structure–deactivation relationship for ZSM-5 catalysts governed by framework defects by Barbera, Katia, Bonino, Francesca, Bordiga, Silvia, Janssens, Ton V.W., Beato, Pablo

“…Internal framework defects are crucial for the deactivation behaviour of the ZSM-5 catalysts in the conversion of methanol to hydrocarbons. While the activity…”
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Importance of the Cu oxidation state for the SO2-poisoning of a Cu-SAPO-34 catalyst in the NH3-SCR reaction by Hammershøi, Peter S., Vennestrøm, Peter N.R., Falsig, Hanne, Jensen, Anker D., Janssens, Ton V.W.

“…[Display omitted] •Deactivation of Cu-SAPO-34 by SO2 in O2 + H2O + NO + NH3 depends on the total SO2 exposure.•S/Cu ratios are always lower than 1 after…”
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Location and activity of VOx species on TiO2 particles for NH3-SCR catalysis by Ganjkhanlou, Yadolah, Janssens, Ton V.W., Vennestrøm, Peter N.R., Mino, Lorenzo, Paganini, Maria Cristina, Signorile, Matteo, Bordiga, Silvia, Berlier, Gloria

“…NH3-SCR activity dependence of VOx-TiO2 catalyst on V loading. Dispersion of VOx species and their evolution on anatase crystal have been proposed based on the…”
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Benzene co-reaction with methanol and dimethyl ether over zeolite and zeotype catalysts: Evidence of parallel reaction paths to toluene and diphenylmethane by Martinez-Espin, Juan S., De Wispelaere, Kristof, Westgård Erichsen, Marius, Svelle, Stian, Janssens, Ton V.W., Van Speybroeck, Veronique, Beato, Pablo, Olsbye, Unni

“…[Display omitted] •Different reactivity of methanol and DME toward benzene is observed.•DME promotes (successive) methylation of arenes and dealkylation…”
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A new approach to the modeling of deactivation in the conversion of methanol on zeolite catalysts by Janssens, Ton V.W.

“…The lifetime to 50% conversion is entirely determined by the deactivation properties; differences in the slope of the decay reflect different catalytic…”
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Kinetic modeling of deactivation profiles in the methanol-to-hydrocarbons (MTH) reaction: A combined autocatalytic–hydrocarbon pool approach by Janssens, Ton V.W., Svelle, Stian, Olsbye, Unni

“…Modeled coke profile versus reactor coordinate and time on stream during the methanol-to-hydrocarbons reaction over a zeolite catalyst. [Display omitted]…”
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The Effect of Pt Particle Size on the Oxidation of CO, C3H6, and NO Over Pt/Al2O3 for Diesel Exhaust Aftertreatment by Hansen, Thomas Klint, Høj, Martin, Hansen, Brian Brun, Janssens, Ton V. W., Jensen, Anker Degn

“…Platinum-based oxidation catalysts applied for diesel exhaust aftertreatment constitute a significant part of system costs. Effective utilization of platinum…”
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Solid-State Ion-Exchange of Copper into Zeolites Facilitated by Ammonia at Low Temperature by Shwan, Soran, Skoglundh, Magnus, Lundegaard, Lars F, Tiruvalam, Ramchandra R, Janssens, Ton V.W, Carlsson, Anna, Vennestrøm, Peter N.R

“…The effect of the gas phase during solid-state ion-exchange of copper into zeolites was studied by exposing physical mixtures of copper oxides (CuI 2O and…”
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Activation of Oxygen and NO in NH3-SCR over Cu-CHA Catalysts Evaluated by Density Functional Theory by Falsig, Hanne, Vennestrøm, Peter N. R., Moses, Poul Georg, Janssens, Ton V. W.

“…The activation of NO by oxygen is a crucial step in the selective catalytic reduction of NO by NH 3 over Cu-CHA catalysts. In this article, the transition…”
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Relation between nanoscale Au particle structure and activity for CO oxidation on supported gold catalysts by Janssens, Ton V.W., Carlsson, Anna, Puig-Molina, Anna, Clausen, Bjerne S.

“…The CO oxidation activity of Au/TiO 2, Au/MgAl 2O 4, and Au/Al 2O 3 catalysts, all containing approximately 4 wt% Au, was compared with the detailed size and…”
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Hierarchical Vanadia Model Catalysts for Ammonia Selective Catalytic Reduction by Hess, Christian, Waleska, Philipp, Ratzka, Michaela, Janssens, Ton V. W., Rasmussen, Søren B., Beato, Pablo

“…There is an ongoing debate on the structure of titania supported vanadia used for catalytic partial oxidation reactions as well as for abatement of nitrogen…”
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In situ X-ray absorption study of Cu species in Cu-CHA catalysts for NH3-SCR during temperature-programmed reduction in NO/NH3 by Negri, Chiara, Borfecchia, Elisa, Martini, Andrea, Deplano, Gabriele, Lomachenko, Kirill A., Janssens, Ton V. W., Berlier, Gloria, Bordiga, Silvia

“…Ammonia-mediated selective catalytic reduction (NH 3 -SCR) using Cu-exchanged chabazite zeolites as catalysts is one of the leading technologies for NO x…”
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The Role of Protons and Formation Cu(NH3)2+ During Ammonia-Assisted Solid-State Ion Exchange of Copper(I) Oxide into Zeolites by Vennestrøm, Peter N. R., Lundegaard, Lars F., Tyrsted, Christoffer, Bokarev, Dmitriy A., Mytareva, Alina I., Baeva, Galina N., Stakheev, Alexandr Y., Janssens, Ton V. W.

“…Solid-state ion exchange in mixtures of copper oxides and zeolites can occur at temperatures as low as 200–250 °C in the presence of ammonia (NH 3 -SSIE), thus…”
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