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Zeolite NaCaA as a desulphurization adsorbent – modification of its thermal and hydrothermal stability
Author(s) -
Lutz W.,
Bülow M.,
Feoktistova N. N.,
Vtjurina L. B.,
Shdanov S. P.,
Siegel H.
Publication year - 1989
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170240206
Subject(s) - zeolite , hydrothermal circulation , thermal stability , alkalinity , ion exchange , aqueous solution , adsorption , chemical engineering , slurry , chemistry , hydrothermal synthesis , inorganic chemistry , mineralogy , materials science , ion , organic chemistry , catalysis , composite material , engineering
The thermal and hydrothermal stability of the zeolite NaCaA in dependence on the ion exchange degree have been investigated. The increasing thermal stability of the zeolite with increasing content of calcium ions corresponds to the higher stability of calcium silicates compared with sodium silicates. In contrast to that the decreasing hydrothermal stability is due to the decreasing alkalinity of the zeolite in aqueous media. Measurements of the p H‐value of zeolite/water slurries underline this tendency.