Ultra-Low temperature CO oxidation activity of octahedral site cobalt Species in Co3O4 based catalysts: unravelling the origin of unique catalytic property

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dc.contributor.author Baidya, Tinku
dc.contributor.author Murayama, Toru
dc.contributor.author Nellaiappan, Subramanian
dc.contributor.author Katiyar, Nirmal Kumar
dc.contributor.author Bera, Parthasarathi
dc.contributor.author Safonova, Olga
dc.contributor.author Lin, Mingyue
dc.contributor.author Priolkar, Kaustubh R.
dc.contributor.author Kundu, Samapti
dc.contributor.author Rao, Bolla Srinivasa
dc.contributor.author Steiger, Patrick
dc.contributor.author Sharma, Sudhanshu
dc.contributor.author Biswas, Krishanu
dc.contributor.author Pradhan, Swapan Kumar
dc.contributor.author Nakka, Lingaiah
dc.contributor.author Malviya, Kirtiman Deo
dc.contributor.author Masatake, Haruta
dc.date.accessioned 2019-07-29T10:58:32Z
dc.date.available 2019-07-29T10:58:32Z
dc.date.issued 2019-07
dc.identifier.citation Baidya, Tinku; Murayama, Toru; Nellaiappan, Subramanian; Katiyar, Nirmal Kumar; Bera, Parthasarathi; Safonova, Olga; Lin, Mingyue; Priolkar, Kaustubh R.; Kundu, Samapti; Rao, Bolla Srinivasa; Steiger, Patrick; Sharma, Sudhanshu; Biswas, Krishanu; Pradhan, Swapan Kumar; Nakka, Lingaiah; Malviya, Kirtiman Deo and Masatake Haruta, “Ultra-Low temperature CO oxidation activity of octahedral site cobalt Species in Co3O4 based catalysts: unravelling the origin of unique catalytic property”, The Journal of Physical Chemistry C, DOI: 10.1021/acs.jpcc.9b04136, Jul. 2019. en_US
dc.identifier.issn 1932-7447
dc.identifier.issn 1932-7455
dc.identifier.uri https://doi.org/10.1021/acs.jpcc.9b04136
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/4625
dc.description.abstract Co3O4 with spinel structure shows CO oxidation activity at very low temperature under dry condition. This study aims at finding the origin of the unique catalytic activity of Co species in Co3O4 based oxides. Although, Octahedral site Co3+ species has been reported to be active in Co3O4 based catalyst, there is no solid explanation as to why Co is so special as compared with other metal like Fe having similar redox states. In this study, mainly, three model spinel catalysts including MnCo2O4, MnFe2O4 and CoCr2O4 have been chosen. The detailed analysis of bulk and crystal surface structure, surface properties of the catalysts and redox properties of the active metals have been performed to understand the unusual catalytic activity. Low-temperature CO oxidation activity decreases in the following order: MnCo2O4 >> MnFe2O4 > CoCr2O4. It indicates that Co2+ species in tetrahedral site (in CoCr2O4) remains inactive for low-temperature catalytic activity, while Co3+ in octahedral site (in MnCo2O4) is active in Co3O4 based catalysts. This result is corroborated with CoFe2O4 which shows higher activity than CoCr2O4, as it has partial occupation of octahedral site. Fe, being a weak redox metal, does not show low-temperature activity, although, crystallite facets of MnCo2O4 and MnFe2O4 catalysts are predominantly exposed in (100) and (110) lattice planes, which contain quite similar concentration of Co3+ and Fe3+ species in both. Intensity of redox peak for CO oxidation involving Co3+/Co2+ couple in MnCo2O4 indicates a highly favorable reaction, while a non-responsive behavior of Co species is observed in CoCr2O4. As expectedly, MnFe2O4 is proven to be a weak, giving a much lower intensity of electrochemical CO oxidation. Both CO- and H2-TPR indicate much higher reducibility of Co species in MnCo2O4 as compared with Co species in CoCr2O4 or Fe in MnFe2O4. en_US
dc.description.statementofresponsibility by Tinku Baidya, Toru Murayama, Subramanian Nellaiappan, Nirmal Kumar Katiyar, Parthasarathi Bera, Olga Safonova, Mingyue Lin, Kaustubh R. Priolkar, Samapti Kundu, Bolla Srinivasa Rao, Patrick Steiger, Sudhanshu Sharma, Krishanu Biswas, Swapan Kumar Pradhan, Lingaiah Nakka, Kirtiman Deo Malviya and Haruta Masatake
dc.language.iso en_US en_US
dc.publisher ACS Publication en_US
dc.title Ultra-Low temperature CO oxidation activity of octahedral site cobalt Species in Co3O4 based catalysts: unravelling the origin of unique catalytic property en_US
dc.type Article en_US
dc.relation.journal The Journal of Physical Chemistry C en

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