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- W119275630 abstract "Three-way autocatalysts comprised of Pt-Rh/CeO2-Al2O3 are able to store sulphur and then to release it suddenly in the form of H2S. The storage occurs by the formation of sulphates under a fuel-lean exhaust gas; the release is induced by a change to rich conditions. Current production autocatalysts are suitably modified to minimise the effects of this storage/release cycle. Thermodynamic calculations have been used to predict the stable phases of a catalyst, and to model the possible changes in pH2S after a lean-rich transition. For a series of metal oxides, which may be components of a complete catalyst, substantial differences are expected in the composition of the gases evolved during the dissociation of the corresponding metal sulphates. For example, the decomposition of Ce2(SO4)3 should yield CeO2, with S and O being released in the ratio 1:2.66, but NiSO4 should ultimately form Ni3S2, with a ratio of 1:12 for S:O. Despite such differences, the calculations indicate that Ce, Al, Fe and Ni (but not Ca) should each act to reduce the steady-state H2S content of the fuel-rich gas stream, provided the gas stream is saturated with the decomposition products. The known ability of CeO2 to increase the emission of H2S well above the steady-state concentration implies that kinetic limitations must prevent final equilibrium being reached. This study reveals that even if a catalyst additive forms sulphates under lean conditions, it may still be able to attenuate H2S. In the ideal case, the sulphate will readily decompose on switching to a rich atmosphere, and will release a large excess of oxygen (relative to sulphur); the resultant oxide may also be able to scavenge any available H2S from the gas-phase." @default.
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- W119275630 date "1991-01-01" @default.
- W119275630 modified "2023-09-26" @default.
- W119275630 title "Role of Sulphate Decomposition in the Emission and Control of Hydrogen Sulphide from Autocatalysts" @default.
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- W119275630 doi "https://doi.org/10.1016/s0167-2991(08)62993-6" @default.
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