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Heulandite molecular sieves with a SiAl ratio of 3.2 3.8 have been synthesized hydrothermally in the presence of the alkali cations Li + ; Li + , K + ; and Na + , K + at 190°C at autogenous pressure. They have been characterized by X-ray powder diffraction and scanning electron micrographs. Heulandites can be formed in the Li + and Na + ...
This paper describes the preparation and characterization of new PILC materials with mixed pillars of Cr 3+ and Al 3+ intercalated between the layers of montmorillonite. Various CrAl ratios were studied to obtain the most suitable physicochemical products. The resulting materials showed basal spacing between 2.49 nm and 1.90 nm for air-dried samples and surface areas between...
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