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- W60624269 abstract "Publisher Summary This chapter examines the use of zeolites and other molecular sieves for preparing sulfur pigments analogous to ultramarine. The conventional procedure with kaolin as a starting material can be supplemented by syntheses based on zeolites. The syntheses can be conducted in a broad range of temperatures including relatively low ones. Much lower (compared to kaolin) content of sulfur (or sulfur compounds) in mixture with zeolites suffices to obtain the products of intense colouration. The sulfur radical precursors can be introduced into zeolites either during their hydrothermal crystallization in the presence of sulfur compounds or during thermal treatment of zeolites mixed with sulfur (together with alkalis) or alkali sulfides. The thermal treatment of zeolites with radical precursors results in the formation of coloured products with maintained zeolite structures if low temperatures and low alkalinity of mixtures are applied. More drastic conditions always cause the structure transformation toward sodalite, provided that sodium is the only, or a very prevalent alkali cation in the mixture. Lack or deficit of Na cations results in recrystallization toward other structures. The application of zeolites allows to attain a broader range of product colours than during conventional synthesis from kaolin and substantially lowers the emission of polluting gases. The cations introduced into zeolites or applied as alkali sources influence the structure and coloration of the products. The sulfur pigments obtained from zeolites are more susceptible than the conventional ultramarine for a post-synthesis treatment with cations which results in a colour modification." @default.
- W60624269 created "2016-06-24" @default.
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- W60624269 date "2009-01-01" @default.
- W60624269 modified "2023-09-26" @default.
- W60624269 title "Inorganic Sulphur Pigments Based on Nanoporous Materials" @default.
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- W60624269 doi "https://doi.org/10.1016/b978-0-444-53189-6.00022-6" @default.
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