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- W3022031829 abstract "Publisher SummaryThis chapter explores the alkalinity in a synthesis batch and its importance for the control of the crystallization of zeolites. It determines their composition and is to a great extent responsible for the type of the crystallizing product. The pH-value of the solution is determined by the total alkali content and complicated buffering equilibria of the mentioned species. Zeolites are usually synthesized in the presence of an amorphous gel phase. The solubility of this gel phase also depends on the alkalinity. It assures the supersaturation for nucleation and growth processes. In systematic studies of the influence of the alkalinity on the product Si/Al-ratio, m is generally used as a critical parameter. Much work has been done in the analysis of the species in silicate and silico-aluminate solutions. Important results have been obtained from NMR. Direct control of the pH during the crystallization would be desirable especially for industrial processes. However, this is difficult because zeolites crystallize at rather high pH values. For a measurement of these values the PtlH2-electrode or the glass-electrode can be used. The batches for zeolite crystallization are prepared by mixing a silicate source and aluminate source and adjusting the excess alkalinity m with a suitable quantity of alkali hydroxide." @default.
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- W3022031829 date "2001-01-01" @default.
- W3022031829 modified "2023-09-24" @default.
- W3022031829 title "The pH-value and its importance for the crystallization of zeolites" @default.
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- W3022031829 doi "https://doi.org/10.1016/b978-044450703-7/50103-4" @default.
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