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Article

New Insight into the Interplay of Method of Deposition, Chemical State of Pd, Oxygen Storage Capability and Catalytic Activity of Pd-Containing Perovskite Catalysts for Combustion of Methane

by
Silva Stanchovska
1,
Georgy Ivanov
1,
Sonya Harizanova
1,
Krasimir Tenchev
2,
Ekaterina Zhecheva
1,
Anton Naydenov
1,* and
Radostina Stoyanova
1
1
Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Bldg 11, 1113 Sofia, Bulgaria
2
Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Bldg 11, 1113 Sofia, Bulgaria
*
Author to whom correspondence should be addressed.
Catalysts 2021, 11(11), 1399; https://doi.org/10.3390/catal11111399
Submission received: 28 October 2021 / Revised: 10 November 2021 / Accepted: 15 November 2021 / Published: 18 November 2021
(This article belongs to the Special Issue Kinetics and Mechanism of Catalytic Reactions—Integrity of Experiment and Theory)
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Abstract

Elaboration of Pd-supported catalysts for catalytic combustion is, nowadays, considered as an imperative task to reduce the emissions of methane. This study provides new insight into the method of deposition, chemical state of Pd and oxygen storage capability of transition metal ions and their effects on the catalytic reactivity of supported catalysts for the combustion of methane. The catalyst with nominal composition La(Co0.8Ni0.1Fe0.1)0.85Pd0.15O3 was supported on SiO2-modified/γ-alumina using two synthetic procedures: (i) aerosol assisted chemical vapor deposition (U-AACVD) and (ii) wet impregnation (Imp). A comparative analysis shows that a higher catalytic activity is established for supported catalyst obtained by wet impregnation, where the PdO-like phase is well dispersed and the transition metal ions display a high oxygen storage capability. The reaction pathway over both catalysts proceeds most probably through Mars–van Krevelen mechanism. The supported catalysts are thermally stable when they are aged at 505 °C for 120 h in air containing 1.2 vol.% water vapor. Furthermore, the experimentally obtained data on La(Co0.8Ni0.1Fe0.1)0.85Pd0.15O3—based catalyst, supported on monolithic substrate VDM®Aluchrom Y Hf are simulated by using a two-dimensional heterogeneous model for monolithic reactor in order to predict the performance of an industrial catalytic reactor for abatement of methane emissions.
Keywords: methane; catalytic combustion; palladium; perovskite; Mars-van Krevelen methane; catalytic combustion; palladium; perovskite; Mars-van Krevelen
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MDPI and ACS Style

Stanchovska, S.; Ivanov, G.; Harizanova, S.; Tenchev, K.; Zhecheva, E.; Naydenov, A.; Stoyanova, R. New Insight into the Interplay of Method of Deposition, Chemical State of Pd, Oxygen Storage Capability and Catalytic Activity of Pd-Containing Perovskite Catalysts for Combustion of Methane. Catalysts 2021, 11, 1399. https://doi.org/10.3390/catal11111399

AMA Style

Stanchovska S, Ivanov G, Harizanova S, Tenchev K, Zhecheva E, Naydenov A, Stoyanova R. New Insight into the Interplay of Method of Deposition, Chemical State of Pd, Oxygen Storage Capability and Catalytic Activity of Pd-Containing Perovskite Catalysts for Combustion of Methane. Catalysts. 2021; 11(11):1399. https://doi.org/10.3390/catal11111399

Chicago/Turabian Style

Stanchovska, Silva, Georgy Ivanov, Sonya Harizanova, Krasimir Tenchev, Ekaterina Zhecheva, Anton Naydenov, and Radostina Stoyanova. 2021. "New Insight into the Interplay of Method of Deposition, Chemical State of Pd, Oxygen Storage Capability and Catalytic Activity of Pd-Containing Perovskite Catalysts for Combustion of Methane" Catalysts 11, no. 11: 1399. https://doi.org/10.3390/catal11111399

APA Style

Stanchovska, S., Ivanov, G., Harizanova, S., Tenchev, K., Zhecheva, E., Naydenov, A., & Stoyanova, R. (2021). New Insight into the Interplay of Method of Deposition, Chemical State of Pd, Oxygen Storage Capability and Catalytic Activity of Pd-Containing Perovskite Catalysts for Combustion of Methane. Catalysts, 11(11), 1399. https://doi.org/10.3390/catal11111399

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