Metal-decorated opal-like silica catalysts: High-temperature reconstructions in cobalt-ceria active layer during simultaneous oxidation of CO and hydrocarbons

Авторы: Veselov Grigory B., Eurov Daniil A., Shilina Marina I., Rostovshchikova Tatiana N., Stoyanovskii Vladimir O., Yagovkina Maria A., Kurdyukov Dmitry A., Vedyagin Aleksey A.
Журнал: Applied Catalysis A: General
Том: 687
Год издания: 2024
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 119981
DOI: 10.1016/j.apcata.2024.119981
Аннотация: Opal-like silica, which represents a new class of SiO2-based nanomaterials, was used as a support for the deposition of cobalt and cerium oxides as active components. A series of samples was prepared and tested in the oxidation of CO and hydrocarbons in a prompt thermal aging regime. As revealed by a set of physicochemical methods, the initial catalytic performance of the samples is high (T50 = 214 ◦С) due to the emergence of newcatalytic sites, which appeared as a result of interaction between Co and Ce oxides located between silica nanospheres in a close proximity to each other. At 800 ◦C, these particles undergo agglomeration, which is expressed in a slight deactivation of the catalysts (T50 ≥ 260 ◦С). The bulk silicate phase is formed at 900 ◦C, thusleading to further deactivation. Recovering of the catalytic activity (T50 = 252 ◦С) takes place at 1000 ◦С.
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