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- W3149780547 abstract "It has been observed that the surface of heated illite is enriched in iron, potassium, calcium, and sulfur. Specifically, potassium, calcium, and sulfur reside in the outermost atomic layers of the iron-enriched aluminosilicate surface. The temperature dependence of this thermally-induced surface enrichment has been characterized for temperatures in the range of 150/sup 0/ to 1100/sup 0/ and heating periods on the order of twelve hours. Bulk depletion and desorption of potassium and sulfur have also been observed. The results can be qualitatively understood in terms of surface segregation. Having observed that the thermodynamics of surface enrichment are favorable, it is clear that the rates of enrichment are needed to further define the role of surface enrichment in the surface chemistry of the entrained or deposited aluminosilicate ash particles. In addition, the rates of desorption and adsorption for potassium and sulfur species are required to assess the extent of the release of these species into the combustion stream. The experimental results and the physical considerations included in the physical model indicate that, irrespective of the rates of surface enrichment, gas-surface reactions involving aluminosilicate and enriched aluminosilicate surfaces are of importance. Although a number of important gas-surface reactions may occur on thesemore » surfaces, those of greatest interest involve the formation, transport, or removal of corrosive species and atmospheric pollutants.« less" @default.
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- W3149780547 date "1979-08-01" @default.
- W3149780547 modified "2023-09-23" @default.
- W3149780547 title "Surface chemistry of aluminosilicate particles: application to combustion stream chemistry" @default.
- W3149780547 hasPublicationYear "1979" @default.
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