02032nas a2200217   4500008004100000022001400041245011800055210006900173260000800242300001100250490000800261520127100269653003501540653002501575653001201600100002601612700001601638700001901654700002001673856012101693       2025                        eng d  a1387-181100aSynthesis and structural studies of ammonium exchanged synthetic analogue of disordered aluminosilicate natrolite0 aSynthesis and structural studies of ammonium exchanged synthetic  cFEB  a1134410 v3843 a<p>
	The current article reports preparation and structural analysis of NH4+ exchanged form of synthetic natrolite zeolite (NH4-natrolite) with disordered structure wherein Si and Al occupies all the tetrahedral (T) sites in the zeolite framework. Structural data is used to gain insight into the structural parameters those influence thermal stability of its proposed H-form. NH4-natrolite is prepared by ion-exchange method from K-natrolite (which was also obtained by ion-exchange with Na-natrolite). Na-natrolite, K-natrolite and NH4-natrolite prepared in this study were tested for their structural, morphological and thermal analysis. Synchrotron X-ray diffraction data was utilized to estimate the crystal structures of hydrated forms of Na-natrolite, K-natrolite and NH4-exchanged natrolites. Thermal analysis of NH4-natrolite revealed that the dehydration is followed by removal of ammonia during calcination. The role of the size (radius) and nature (either divalent or monovalent) of the exchangeable cations present in the channels, the framework chemical content and extent of `T' atom ordering have been collectively discussed and correlated with the structural behaviour of calcined NH4-natrolite to explain its thermal stability in better way.</p>
10aCrystal structure of natrolite10aDisordered framework10azeolite1 aGavhane, Manjusha, J.1 aJha, R., K.1 aNam, Kyung-Wan1 aBhange, Deu, S.  uhttps://library.ncl.res.in/content/synthesis-and-structural-studies-ammonium-exchanged-synthetic-analogue-disordered