Search Results - "Kinnunen, Niko M."

PdSO4 Surfaces in Methane Oxidation Catalysts: DFT Studies on Stability, Reactivity, and Water Inhibition by Auvinen, Paavo, Hirvi, Janne T, Kinnunen, Niko M, Suvanto, Mika

“…Although it is experimentally difficult to observe, PdSO4 is considered to be the culprit for the reduced activity of SO2-poisoned methane oxidation catalysts…”
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Role of the Interface between Pd and PdO in Methane Dissociation by Kinnunen, Niko M, Hirvi, Janne T, Suvanto, Mika, Pakkanen, Tapani A

“…Dissociation of the first C–H bond of methane was investigated at the interface of partial PdO(101) monolayer and supporting Pd(100) surface with density…”
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Methane combustion activity of Pd–PdOx–Pt/Al2O3 catalyst: The role of platinum promoter by Kinnunen, Niko M., Hirvi, Janne T., Suvanto, Mika, Pakkanen, Tapani A.

“…[Display omitted] ► Addition of Pt improves aging durability of the Pd–PdOx catalyst. ► Active phase of the catalysts consists of metallic (M) and metal oxide…”
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Procedure to tailor activity of methane combustion catalyst: Relation between Pd/PdOx active sites and methane oxidation activity by KINNUNEN, Niko M, HIRVI, Janne T, VENÄLÄINEN, Tapani, SUVANTO, Mika, PAKKANEN, Tapani A

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Fundamentals of Sulfate Species in Methane Combustion Catalyst Operation and Regeneration—A Simulated Exhaust Gas Study by Niko M. Kinnunen, Kauko Kallinen, Teuvo Maunula, Matthew Keenan, Mika Suvanto

“…Emission regulations and legislation inside the European Union (EU) have a target to reduce tailpipe emissions in the transportation sector. Exhaust gas…”
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Decomposition of Al2O3-Supported PdSO4 and Al2(SO4)3 in the Regeneration of Methane Combustion Catalyst: A Model Catalyst Study by Niko M. Kinnunen, Ville H. Nissinen, Janne T. Hirvi, Kauko Kallinen, Teuvo Maunula, Matthew Keenan, Mika Suvanto

“…Exhaust gas aftertreatment systems play a key role in controlling transportation greenhouse gas emissions. Modern aftertreatment systems, often based on Pd…”
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Formation of NH3 and N2O in a modern natural gas three-way catalyst designed for heavy-duty vehicles: the effects of simulated exhaust gas composition and ageing by Nevalainen, Pauliina, Kinnunen, Niko M., Kirveslahti, Anna, Kallinen, Kauko, Maunula, Teuvo, Keenan, Matthew, Suvanto, Mika

“…[Display omitted] •NO and CH4 concentrations in exhaust gas affect NH3 and N2O formation.•Increasing temperature restricts NH3 and N2O formation with fresh…”
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Case study of a modern lean-burn methane combustion catalyst for automotive applications: What are the deactivation and regeneration mechanisms? by Kinnunen, Niko M., Hirvi, Janne T., Kallinen, Kauko, Maunula, Teuvo, Keenan, Matthew, Suvanto, Mika

“…[Display omitted] •Sulfur poisoned CH4 oxidation catalyst is active in dry gas feed.•Deactivation of lean-burn CH4 oxidation catalyst is a joint effect of SO2…”
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Regeneration of a sulfur-poisoned methane combustion catalyst: Structural evidence of Pd4S formation by Nissinen, Ville H., Kinnunen, Niko M., Suvanto, Mika

“…[Display omitted] •Regeneration of a methane combustion catalyst was studied using a PdSO4/Al2O3 model system.•PdSO4 behaves differently under inert and…”
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A detailed study on regeneration of SO2 poisoned exhaust gas after-treatment catalysts: In pursuance of high durability and low methane, NH3 and N2O emissions of heavy-duty vehicles by Auvinen, Paavo, Nevalainen, Pauliina, Suvanto, Mika, Oliva, Fermín, Llamas, Xavier, Barciela, Bruno, Sippula, Olli, Kinnunen, Niko M.

“…[Display omitted] •O2 concentration prescribes the efficiency of catalyst regeneration.•N2O and NH3 formation during regeneration depends on catalyst and O2…”
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Thermal treatment of municipal solid waste incineration fly ash: Impact of gas atmosphere on the volatility of major, minor, and trace elements by Lane, Daniel J., Jokiniemi, Jorma, Heimonen, Mikko, Peräniemi, Sirpa, Kinnunen, Niko M., Koponen, Hanna, Lähde, Anna, Karhunen, Tommi, Nivajärvi, Taina, Shurpali, Narasinha, Sippula, Olli

“…•Only C and Cu were more volatile in oxidising conditions.•Sn and Sb only volatilised in reducing conditions.•Bi, Cd, Pb, S, and Zn became volatile at lower…”
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Hydroformylation of 1-Hexene over Rh/Nano-Oxide Catalysts by Sari Suvanto, Matti Haukka, Maija-Liisa Kontkanen, Matti Tuikka, Niko M. Kinnunen

“…The effect of nanostructured supports on the activity of Rh catalysts was studied by comparing the catalytic performance of nano- and bulk-oxide supported…”
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Development of a rapid ageing technique for modern methane combustion catalysts in the laboratory: Why does SO2 concentration play an essential role? by Auvinen, Paavo, Kinnunen, Niko M., Hirvi, Janne T., Maunula, Teuvo, Kallinen, Kauko, Keenan, Matthew, Baert, Rik, van den Tillaart, Erik, Suvanto, Mika

“…[Display omitted] •Rapid ageing of a MOC catalyst was studied at three different SO2 concentrations.•Results suggested that sulphur concentration affected the…”
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Engineered Sulfur‐Resistant Catalyst System with an Assisted Regeneration Strategy for Lean‐Burn Methane Combustion by Kinnunen, Niko M., Keenan, Matthew, Kallinen, Kauko, Maunula, Teuvo, Suvanto, Mika

“…Catalytic combustion of methane, the main component of natural gas, is a challenge under lean‐burn conditions and at low temperatures owing to sulfur poisoning…”
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Volatilisation of major, minor, and trace elements during thermal processing of fly ashes from waste- and wood-fired power plants in oxidising and reducing gas atmospheres by Lane, Daniel J., Sippula, Olli, Koponen, Hanna, Heimonen, Mikko, Peräniemi, Sirpa, Lähde, Anna, Kinnunen, Niko M., Nivajärvi, Taina, Shurpali, Narasinha, Jokiniemi, Jorma

“…•Impact of atmosphere varied greatly depending on fly ash type and temperature.•Low release of heavy metals from wood combustion fly ash in an oxidising…”
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Preparation and characterization of Pd–Ni bimetallic catalysts for CO and C3H6 oxidation under stoichiometric conditions by Hilli, Yulia, Kinnunen, Niko M., Suvanto, Mika, Savimäki, Auli, Kallinen, Kauko, Pakkanen, Tapani A.

“…•In Pd–Ni catalysts Ni exists in the form of NiO and Ni–Al2O3 spinel-like structures.•Pd–Ni competition for support sites affects Pd-support and Ni-support…”
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Characterization and Activity of Pd–Ir Catalysts in CO and C3H6 Oxidation Under Stoichiometric Conditions by Shipitcyna, Anastasiia, Kinnunen, Niko M., Hilli, Yulia, Suvanto, Mika, Pakkanen, Tapani A.

“…Bimetallic Pd–Ir catalysts based on halogen free precursors supported on alumina and La-stabilized alumina were prepared and characterized. The influence of…”
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Sulfur adsorption and release properties of bimetallic Pd–Ni supported catalysts by Hilli, Yulia, Kinnunen, Niko M., Suvanto, Mika, Savimäki, Auli, Kallinen, Kauko, Pakkanen, Tapani A.

“…[Display omitted] •Stabilization of Ni on catalyst surface by formation of spinel structure.•Solvent concentration affects the ratio between NiO and NiAl2O4 in…”
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Structural Preferences of Single-Walled Silica Nanostructures: Nanospheres and Chemically Stable Nanotubes by Linnolahti, Mikko, Kinnunen, Niko M., Pakkanen, Tapani A.

“…Structural preferences of single‐walled and coordinatively saturated spherical and tubular nanostructures of silica have been determined by ab initio…”
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Effects of NO and NO2 on fresh and SO2 poisoned methane oxidation catalyst – Harmful or beneficial? by Auvinen, Paavo, Kinnunen, Niko M., Hirvi, Janne T., Maunula, Teuvo, Kallinen, Kauko, Keenan, Matthew, Suvanto, Mika

“…[Display omitted] •The effect of NO depends on whether the catalyst is in fresh or SO2 poisoned state.•On a fresh catalyst, NO decreases methane conversion due…”
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