Significant effect of multi-doped cerium oxide for carbon monoxide oxidation studies

Kerkar, R. D.; Salker, A. V.

doi:10.1016/j.matchemphys.2020.123326

Cited by 13 publications

(5 citation statements)

References 31 publications

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“…There is no further loss of weight at 400–800 °C, and there is a small rise between 600 and 700 °C indicating CuO formation . These all reveal that the oxide catalysts reported here have no weight loss phenomenon, which is necessary for fulfilling the exhaust criteria …”

Section: Resultssupporting

confidence: 49%

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Catalytic CO Oxidation on the Cu⁺-O_v-Ce³⁺ Interface Constructed by an Electrospinning Method for Enhanced CO Adsorption at Low Temperature

Liu,

Wu,

Wang

et al. 2024

Inorg. Chem.

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It is crucial to eliminate CO emissions using nonnoble catalysts. Cu-based catalysts have been widely applied in CO oxidation, but their activity and stability at low temperatures are still challenging. This study reports the preparation and application of an efficient copper-doped ceria electrospun fiber catalyst prepared by a facile electrospinning method. The obtained 10Cu−Ce fiber catalyst achieved complete CO oxidation at a temperature as low as 90 °C. However, a reference 10Cu/Ce catalyst prepared by the impregnation method needed 110 °C to achieve complete CO oxidation under identical reaction conditions. Asymmetric oxygen vacancies (ASOV) at the interface between copper and cerium were constructed, to effectively absorb gas molecules involved in the reaction, leading to the enhanced oxidation of CO. The exceptional ability of the 10Cu−Ce catalyst to adsorb CO is attributed to its unique structure and surface interaction phase Cu + -O v -Ce 3+ , as demonstrated by a series of characterizations and DFT calculations. This novel approach of using electrospinning offers a promising technique for developing low-temperature and non-noble metal-based catalysts.

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Section: Resultssupporting

confidence: 49%

“…15 These all reveal that the oxide catalysts reported here have no weight loss phenomenon, which is necessary for fulfilling the exhaust criteria. 47…”

Section: Redoxmentioning

confidence: 99%

Catalytic CO Oxidation on the Cu⁺-O_v-Ce³⁺ Interface Constructed by an Electrospinning Method for Enhanced CO Adsorption at Low Temperature

Liu,

Wu,

Wang

et al. 2024

Inorg. Chem.

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“…The tartaric-acid-assisted solution combustion preparative route was employed to synthesize Ru-substituted CeO 2 series . First and foremost, stoichiometric amounts of Ce(NH 4 ) 2 (NO 3 ) 6 (Sigma-Aldrich) and RuCl 3 (Sigma-Aldrich) were dissolved in double distilled water.…”

Section: Methodsmentioning

confidence: 99%

Low Temperature NO and CO Conversion with a Mechanistic Approach on Ru-Composed Cerium Oxide

Kerkar,

Salker

2024

Langmuir

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Catalytic reduction of NO with CO at a lower temperature is an extremely challenging task, thus requiring conceivable surfaces to overcome such issues. Ru-substituted CeO 2 catalysts prepared via the solution combustion method were employed in CO oxidation and NO−CO conversion studies. The characterization for material formation and surface structure was carried out through XRD, SEM, TEM, and BET surface area. The catalytic study revealed the promising behavior of 5% Ru in CeO 2 for the 100% conversion of NO−CO at 150 °C, proving it to be an excellent exhaust material. These observed results are also supported by temperature-programmed studies, i.e. TPD of NO and CO in addition to NH 3 -TPD and H 2 -TPR for their convincible surface interaction that is inclined toward a significant change in the conversion path. Additionally, the proposed mechanism, based on the experimental evidence, sheds light on the NO−CO redox reaction, directing the reaction pathway toward the Langmuir− Hinshelwood and Mars-Van Krevelen-type route. Moreover, the exceptional performance can be attributed to the strategic incorporation of Ru in CeO 2 , where the strong interaction of Ru−Ce is able to gain a high synergy for NO and CO conversion.

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“…It was also reported that the trend for CO conversion decreased in the order of CeO 2 -CuO > CuO > CeO 2 . Furthermore, their following study, 203 involved multidoping Ce with Mn, Cu, and Ag, and it significantly enhanced activity due to great adsorption and oxygen mobility with a conversion temperature of 95 °C. The primary goal is now not only to enhance stable activity but also to find alternatives to noble metal catalysts.…”

Section: B100mentioning

confidence: 99%

Advancements in In-Cylinder and After-Treatment Strategies for Mitigating Pollutants from Diesel Engines: A Critical Review

Da Costa,

Bukkarapu,

Fernandes

et al. 2024

Energy Fuels

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Although diesel after-treatment techniques demonstrate a substantial decrease in tailpipe emissions, the primary goal continues to be attaining nearly zero emissions to comply with current regulatory requirements and foreseeable imminent rigorous regulations. To achieve this objective, engine combustion systems and fuel formulations require fine-tuning. Taking insights from the recent literature, this review examines various processes, including homogeneous in situ methods, the incorporation of fuel-borne catalysts, and the use of biofuels. Despite progress in in-cylinder pollution mitigation techniques like low-temperature combustion, which exhibits substantial reductions in oxides of nitrogen (NO x ) and soot emissions, it is crucial to consistently advance technology to conform to evolving emission regulations and environmental concerns. A discussion is presented regarding the advantages and disadvantages of the homogeneous charge compression ignition (HCCI) mode and their potential for the future, focusing on biodiesel-fueled HCCI engines. The review assesses the effectiveness of thermal management strategies and engine design modifications that extend the operational range of HCCI engines powered by biodiesel in light of the inherent limitation of a restricted engine operating range. The review critically examines the merits and demerits of biofuels and HCCI systems and provides an essential analysis of current after-treatment approaches. With an imperative focus, the primary aim of this review is to ascertain modern catalysts designed explicitly for use in contemporary combustion systems. An exhaustive examination of the progress made in diesel oxidation catalysts, selective catalytic reduction techniques, lean NO x traps, diesel particulate filters, and catalyst regeneration is presented. The concluding remarks analyze the catalytic characteristics necessary for smooth incorporation with modern technological developments in various combustion systems.

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Significant effect of multi-doped cerium oxide for carbon monoxide oxidation studies

Cited by 13 publications

References 31 publications

Catalytic CO Oxidation on the Cu⁺-O_v-Ce³⁺ Interface Constructed by an Electrospinning Method for Enhanced CO Adsorption at Low Temperature

Catalytic CO Oxidation on the Cu⁺-O_v-Ce³⁺ Interface Constructed by an Electrospinning Method for Enhanced CO Adsorption at Low Temperature

Low Temperature NO and CO Conversion with a Mechanistic Approach on Ru-Composed Cerium Oxide

Advancements in In-Cylinder and After-Treatment Strategies for Mitigating Pollutants from Diesel Engines: A Critical Review

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Significant effect of multi-doped cerium oxide for carbon monoxide oxidation studies

Cited by 13 publications

References 31 publications

Catalytic CO Oxidation on the Cu+-Ov-Ce3+ Interface Constructed by an Electrospinning Method for Enhanced CO Adsorption at Low Temperature

Catalytic CO Oxidation on the Cu+-Ov-Ce3+ Interface Constructed by an Electrospinning Method for Enhanced CO Adsorption at Low Temperature

Low Temperature NO and CO Conversion with a Mechanistic Approach on Ru-Composed Cerium Oxide

Advancements in In-Cylinder and After-Treatment Strategies for Mitigating Pollutants from Diesel Engines: A Critical Review

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Product

Resources

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Catalytic CO Oxidation on the Cu⁺-O_v-Ce³⁺ Interface Constructed by an Electrospinning Method for Enhanced CO Adsorption at Low Temperature

Catalytic CO Oxidation on the Cu⁺-O_v-Ce³⁺ Interface Constructed by an Electrospinning Method for Enhanced CO Adsorption at Low Temperature