Abstract
Reported here are new data on the structural and catalytic properties of a series of mono-component cobalt and bi-component Co–Ce catalysts supported on SBA-15 (Santa Barbara Amorphous-15)). The catalysts performance has been evaluated by tests on combustion of methane, propane, and n-hexane. It was established that the preparation of the Co–Ce catalysts by the ‘two-solvent’ technique does not significantly change the mesoporous structure, however, its pores are clogging with the Co and Ce guest species. Cobalt and cerium are uniformly distributed and preferentially fill up the channels of SBA-15, but oxide agglomerates located on the surface are observed as well. The highest activity of the mono-component cobalt sample is explained by its higher reducibility as a result of lower interaction of the cobalt oxide with the SBA-15. The fine dispersion of cobalt and cerium oxide and their strong interaction in the channels of the SBA-15 molecular sieve, leads to the formation of difficult-to-reduce oxide phases and, consequently, to lower catalytic activity compared to monocomponent cobalt oxide catalyst. The synthesised mesoporous structure can prevent the agglomeration of the oxide particles, thus leading to the successful development of a new and stable catalyst for decreasing greenhouse gas emissions.
Highlights
The major air pollutants are volatile organic compounds (VOCs)
The specified volatile organic compounds are chosen because methane is the second most abundant greenhouse gas with a global warming potential ca. 20 times greater than CO2, propane is the main component in the liquefied petroleum gas (LPG) and n-hexane, because it is the component of many products related to industry and in the air it participates in a radical reaction yielding 2-hexanone, 2-and 3-hexyl nitrate, and 5-hydroxy-2-pentanone, all of them existing in photochemical smog
The catalysts’ performance of a series of mono-component cobalt and bi-component Co–Ce catalysts supported on SBA-15 in combustion of methane, propane, and n-hexane showed high selectivity to H2O and CO2, the extent of incomplete oxidation to CO being negligible
Summary
The major air pollutants are volatile organic compounds (VOCs). They contribute to a number of environmental problems such as formation of ground-level ozone, formation of photochemical smog, and toxic air emissions. Because of close interaction between Co3O4 and CeO2 in the catalyst prepared with a common solution of Co and Ce nitrates, more surface oxygen species are provided to the cobalt oxide [7]. It is, reasonable to assume that the combination of cobalt with ceria-containing SBA-15 will lead to good catalytic performance. The present paper is focused on of mixed Co–Ce oxide catalysts for the combustion of different VOCs. The work is focused on the investigation of the structural and catalytic properties of series of mono-component cobalt and bi-component Co–Ce catalysts supported on SBA-15. The specified volatile organic compounds are chosen because methane is the second most abundant greenhouse gas with a global warming potential ca. 20 times greater than CO2, propane is the main component in the liquefied petroleum gas (LPG) (composed of primarily propane and butane) and n-hexane, because it is the component of many products related to industry and in the air it participates in a radical reaction yielding 2-hexanone, 2-and 3-hexyl nitrate, and 5-hydroxy-2-pentanone, all of them existing in photochemical smog
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