Cobalt oxide decorated porous silica particles: Structure and activity relationship in the catalytic oxidation of carbon monoxide

Eurov, D.A.; Rostovshchikova, T.N.; Shilina, M.I.; Kirilenko, D.A.; Tomkovich, M.V.; Yagovkina, M.A.; Udalova, O.V.; Kaplin, I.Y.; Ivanin, I.A.; Kurdyukov, D.A.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 3 февраля 2022 г.

Авторы: Eurov Daniil A., Rostovshchikova Tatiana N., Shilina Marina I., Kirilenko Demid A., Tomkovich Maria V., Yagovkina Maria A., Udalova Olga V., Kaplin Igor Yu, Ivanin Igor A., Kurdyukov Dmitry A.
Журнал: Applied Surface Science
Том: 579
Год издания: 2022
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 152121
DOI: 10.1016/j.apsusc.2021.152121
Аннотация: Porous (0.6–30 nm) and non-porous spherical silica nanoparticles are synthesized. These silicas with different morphologies are decorated with cobalt (2.9 wt%) using Co(NO3)2⋅6H2O as precursor. Co-SiO2 particles are studied by N2 sorption, TEM, XRD, XPS, FTIR and TPR-H2 methods. Specific surface area (SSA) of the prepared materials is 10–1200 m2/g. The main crystalline phase is identified as Co3O4. The activity of Co-SiO2 compositesin the CO oxidation and preferential oxidation of CO (PROX) in a H2-rich gas mixture improves with increasing atomic ratios of Co/Si and Co3+/Co2+ on the silica surface. Catalysts with the large mesopores containing mainly Co2+ are the least active. Co-SiO2 composites based on synthetic opal grown by sedimentation of non-porous silica particles with the lowest SSA demonstrate the highest catalytic activity. The CO conversion reaches 100% at 150 ◦C in the absence of hydrogen, while in PROX the 90% conversion of CO is achieved at 170 ◦C. The large Co3O4 aggregates between non-porous spherical silica particles of opal are the most active and stable during CO-PROX reaction. The lower interaction of Co3O4 nanoparticles with this support promotes the stabilization of the oxidized state Co3+ and provides a higher yield of CO2 in CO-PROX reaction.
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