a  facile  effective  stirring  aging  at  room  temperature  prior  to  conventional  hydrothermal treatment was employed in the template-free synthesis of micro- and nano-crystalline sodalites with  two  different  initial  gel  compositions.  the  effect  of  initial  si/al  molar  ratio,  naoh concentration and stirring aging time were investigated on the morphology and particle size of the...

Isomorphic substitutions of extra-framework components in sodalite-group aluminosilicate minerals and their thermal conversions have been investigated using infrared, Raman, electron spin resonance (ESR), as well ultraviolet, visible near infrared (UV–Vis–near IR) absorption spectroscopy methods involving chemical X-ray diffraction data. Sodalite-related from gem lazurite deposits (haüyne, lazu...

microporous hydroxy-sodalite zeolite membranes with different morphologies were synthesized via secondary growth technique with vacuum seeding on tubular α-al2o3 supports at two different synthesis conditions (i.e. two different routes). microstructures of the synthesized membranes were characterized by x-ray diffraction (xrd), scanning electron microscope (sem) and single gas permeation using ...

Two processes for extracting alumina from low-grade ores are described, one applicable to both clays and high-silica bauxites, and the other only to bauxites. In the former process, a line-containing sinter is prepared and annealed by cooling it slowly through the range of 1,3000 to 1,2000 C. The annealed sinter dusts to a powder which requires no grinding. This material is extracted with a sol...

the utilization of hydroxy sodalite (h-sod) as catalyst under solvent-free condition is described for the efficient preparation of tetrahydrobenzo[b]pyrans. these compounds are synthesized by three-component reactions of aldehydes, alkylnitriles and dimedone. h-sod that is the waste-product of zeolite manufacturing process is used as an efficient and a very inexpensive catalyst. furthermore, it...

A flexible sodalite-type metal organic framework [Cu(pyrimidine-2-olate)2]n (1R) is obtained in a self-assembly process involving Cu2+ ions and pyrimidine-2-olate ligands. 1R suffers a series of sequential and reversible structural changes upon solid-liquid sorption processes of metal nitrates. The 1C-to-1O transformation occurs only with large cations.

A silver(I) 3-D porous coordination polymer (PCP, 1) with a sodalite topology undergoes a remarkable reversible crystal-to-crystal expansion and contraction upon exposure to different solvents. Notably, complete desolvation of 1 also facilitates a transformation to a non-porous 2-D coordination polymer (2).

zeolites due to their structures can be used as molecular sieves for purification of materials and solutions. zeolites with phi and sod structure are so common and applicable for this purpose. hydroxy sodalite and phillipsite are the more abundant members of zeolites which display good selectivity for very small molecules and some ions such as sr, pb, zn, cu and rb. there is not any pure natura...