1972
DOI: 10.1346/ccmn.1972.0200204
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Abstract: Abstract-Kaolinites, catalytically active for the polymerization of styrene, can be deactivated by treatment with l N aqueous sodium chloride. Subsequent washing of the sodium kaolinite results in a facile hydrolysis yielding an active hydronium/aluminum kaolinite in which the exchangeable cations act as surface Br~nsted acid initiation sites.

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Cited by 11 publications
(3 citation statements)
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“…A considerable catalytic activity of kaolinites in nonaqueous media on various other reactions has already been observed. In a number of cases (Hawthorne and Solomon, 1972; Solomon and Murray, 1972), it was observed that moisture content is very important in the interactions at the kaolinite surface: even small amounts of water hindered those reactions. On the other hand, the present results show that adding water in the range of sorbed water may enhance the catalytic decomposition of parathion on the clay surface.…”
Section: Resultsmentioning
confidence: 99%
“…A considerable catalytic activity of kaolinites in nonaqueous media on various other reactions has already been observed. In a number of cases (Hawthorne and Solomon, 1972; Solomon and Murray, 1972), it was observed that moisture content is very important in the interactions at the kaolinite surface: even small amounts of water hindered those reactions. On the other hand, the present results show that adding water in the range of sorbed water may enhance the catalytic decomposition of parathion on the clay surface.…”
Section: Resultsmentioning
confidence: 99%
“…In adsorption and surface chemistry studies, kaolinite is often pretreated to remove gel-like coatings and to expose gibbsite and silica layers (Ferris and Jepson, 1975;Hawthorne and Solomon, 1972). These pretreatments significantly influenced CrO42 adsorption by kaolinite (Figure 1).…”
Section: Influence Of Kaolinite Pretreatmentmentioning
confidence: 99%
“…En fait, la nature du cation 6tant mise ~t part, il faut rechercher l'origine de ces am61iorations dans l'6volution du pouvoir catalytique des kaolins par suite des traitements subis. Certains travaux sur le pouvoir catalytique de la kaolinite (Hawthorne & Solomon, 1972) montrent qu'a priori l'activit6 vis-~i-vis de la polym6risation du styr6ne est meilleure quand le kaolin est d6cationis6; mais ils mettent en 6vidence que les initiateurs de la polym6risation sont les sites acides de Br6nsted qui peuvent certes exister sur le min6ral, mais aussi (et dans des conditions pr6cises) sur les adjuvants adsorb6s, les modalitbs du d6veloppement de tels sites 6tant par ailleurs complexes.…”
Section: Rbpartition Gbographique Des Fautesunclassified