Methane Abatement and Catalyst Durability in Heterogeneous Lean-Rich and Dual-Fuel Conditions

Maunula, Teuvo; Kallinen, Kauko; Kinnunen, Niko M.; Keenan, Matthew; Wolff, Thomas

doi:10.1007/s11244-018-1123-y

Cited by 6 publications

(5 citation statements)

References 13 publications

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“…Therefore, the selected catalysts are required to exhibit very high activity at relatively low temperatures, working with low concentrations of methane (below 1%), while also maintaining an excellent selectivity toward CO 2 . Moreover, the presence of concentrations of up to 10% water vapor and CO 2 (and other pollutants in smaller concentrations) may induce an important deactivation effect on the chosen catalyst, limiting both its activity and lifetime. , …”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the presence of concentrations of up to 10% water vapor and CO 2 (and other pollutants in smaller concentrations) may induce an important deactivation effect on the chosen catalyst, limiting both its activity and lifetime. 6,7 Spinel-type cobalt oxide (Co 3 O 4 ) is widely known for being an active catalyst in environmental applications and has been extensively investigated for the oxidation of VOCs, 8 the abatement of N 2 O, and the combustion of soot, among many other reactions. 9,10 In all cases, the origin of its activity has been connected to its good redox properties, that is, its high reducibility at moderate temperatures.…”

Section: Introductionmentioning

confidence: 99%

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On the Effect of the Synthesis Route of the Support in Co₃O₄/CeO₂ Catalysts for the Complete Oxidation of Methane

Choya

Rivas

Gutiérrez-Ortiz

et al. 2022

Ind. Eng. Chem. Res.

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Six ceria supports synthesized by various synthesis methodologies were used to deposit cobalt oxide. The catalysts were thoroughly characterized, and their catalytic activity for complete methane oxidation was studied. The supports synthesized by direct calcination and precipitation with ammonia exhibited the best textural and structural properties as well as the highest degree of oxidation. The remaining supports presented poorer textural properties to be employed as catalytic supports. The cobalt deposited over the first two supports presented a good dispersion at the external surface, which induced a significant redox effect that increased the number of Co3+ ions on their surface. Consequently, the presence of highly active lattice oxygen species on the surface of these catalysts was favored. Additionally, the optimal active catalyst (Co-DC) revealed a significant resistance to water vapor inhibition, owing to the high hydrophobicity of the ceria support.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Effect of the Synthesis Route of the Support in Co₃O₄/CeO₂ Catalysts for the Complete Oxidation of Methane

Choya

Rivas

Gutiérrez-Ortiz

et al. 2022

Ind. Eng. Chem. Res.

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“…Deactivation of the exhaust gas aftertreatment system is still a challenge, and thus solutions are needed to meet the future durability requirements [21][22][23]. A possible solution to increase the life-time of the exhaust gas aftertreatment system could be a regeneration of the catalyst.…”

Section: Introductionmentioning

confidence: 99%

Fundamentals of Sulfate Species in Methane Combustion Catalyst Operation and Regeneration—A Simulated Exhaust Gas Study

et al. 2019

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Emission regulations and legislation inside the European Union (EU) have a target to reduce tailpipe emissions in the transportation sector. Exhaust gas aftertreatment systems play a key role in low emission vehicles, particularly when natural gas or bio-methane is used as the fuel. The main question for methane operating vehicles is the durability of the palladium-rich aftertreatment system. To improve the durability of the catalysts, a regeneration method involving an efficient removal of sulfur species needs to be developed and implemented on the vehicle. This paper tackles the topic and its issues from a fundamental point of view. This study showed that Al2(SO4)3 over Al2O3 support material inhibits re-oxidation of Pd to PdO, and thus hinders the formation of the low-temperature active phase, PdOx. The presence of Al2(SO4)3 increases light-off temperature, which may be due to a blocking of active sites. Overall, this study showed that research should also focus on support material development, not only active phase inspection. An active catalyst can always be developed, but the catalyst should have the ability to be regenerated.

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“…The combustion of methane requires the activation of the C-H bonds in the methane molecule, which in turn require high reaction temperatures. However, the thermal level of the exhaust from a natural gas engine during normal operation does 2 of 17 not exceed 500-550 • C, well below the range for the purely thermal decomposition of this hydrocarbon [5,6]. Therefore, the selected catalysts are required to exhibit very high activity at relatively low temperatures and contact times, while also maintaining an excellent selectivity towards CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Bulk Co3O4 for Methane Oxidation: Effect of the Synthesis Route on Physico-Chemical Properties and Catalytic Performance

et al. 2022

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The synthesis of bulk pure Co3O4 catalysts by different routes has been examined in order to obtain highly active catalysts for lean methane combustion. Thus, eight synthesis methodologies, which were selected based on their relatively low complexity and easiness for scale-up, were evaluated. The investigated procedures were direct calcination of two different cobalt precursors (cobalt nitrate and cobalt hydroxycarbonate), basic grinding route, two basic precipitation routes with ammonium carbonate and sodium carbonate, precipitation-oxidation, solution combustion synthesis and sol-gel complexation. A commercial Co3O4 was also used as a reference. Among the several examined methodologies, direct calcination of cobalt hydroxycarbonate (HC sample), basic grinding (GB sample) and basic precipitation employing sodium carbonate as the precipitating agent (CC sample) produced bulk catalysts with fairly good textural and structural properties, and remarkable redox properties, which were found to be crucial for their good performance in the oxidation of methane. All catalysts attained full conversion and 100% selectivity towards CO2 formation at a temperature of 600 °C while operating at 60,000 h−1. Among these, the CC catalyst was the only one that achieved a specific reaction rate higher than that of the reference commercial Co3O4 catalyst.

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Methane Abatement and Catalyst Durability in Heterogeneous Lean-Rich and Dual-Fuel Conditions

Cited by 6 publications

References 13 publications

On the Effect of the Synthesis Route of the Support in Co₃O₄/CeO₂ Catalysts for the Complete Oxidation of Methane

On the Effect of the Synthesis Route of the Support in Co₃O₄/CeO₂ Catalysts for the Complete Oxidation of Methane

Fundamentals of Sulfate Species in Methane Combustion Catalyst Operation and Regeneration—A Simulated Exhaust Gas Study

Bulk Co3O4 for Methane Oxidation: Effect of the Synthesis Route on Physico-Chemical Properties and Catalytic Performance

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Methane Abatement and Catalyst Durability in Heterogeneous Lean-Rich and Dual-Fuel Conditions

Cited by 6 publications

References 13 publications

On the Effect of the Synthesis Route of the Support in Co3O4/CeO2 Catalysts for the Complete Oxidation of Methane

On the Effect of the Synthesis Route of the Support in Co3O4/CeO2 Catalysts for the Complete Oxidation of Methane

Fundamentals of Sulfate Species in Methane Combustion Catalyst Operation and Regeneration—A Simulated Exhaust Gas Study

Bulk Co3O4 for Methane Oxidation: Effect of the Synthesis Route on Physico-Chemical Properties and Catalytic Performance

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On the Effect of the Synthesis Route of the Support in Co₃O₄/CeO₂ Catalysts for the Complete Oxidation of Methane

On the Effect of the Synthesis Route of the Support in Co₃O₄/CeO₂ Catalysts for the Complete Oxidation of Methane