02275nas a2200217   4500008004100000022001400041245015900055210006900214260007300283300001000356490000800366520142200374653001001796653002801806653001701834100002001851700001901871700002401890700002001914856012301934       2008                        eng d  a1387-181100aNon-isothermal kinetic studies of the template decomposition from silicalite-1 framework-high temperature X-ray diffraction and thermogravimetric analysis0 aNonisothermal kinetic studies of the template decomposition from  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG  a64-710 v1133 a<p>Non-isothermal decomposition of the tetrapropylammonium cations (TPA(+)) intercalated in silicalite-1 framework has been carried out using thermogravimetric (TG) analysis and high temperature powder X-ray diffraction (HTXRD) techniques. Conversion factor for template decomposition is calculated using two methods viz., % weight loss from the thermogravimetric analysis and changes in the intensities of the Bragg reflections 101/011 and 200/020 in the HTXRD patterns scanned at different temperatures (range 298823 K). The calculated apparent activation energy for template decomposition in air was 129 and 125 kJ mol(-1), respectively, for the two techniques TG and HTXRD, calculated using the Kissinger method. By Flynn-Wall-Ozawa approach of isoconversion, apparent activation energy for template decomposition in air was 123 and 124 U mol-1, respectively, for TG and HTXRD data. The reaction order was determined using the method of Kennedy and Clark and it is similar to 2 by both the techniques. The second order of template decomposition can be attributed to the fact that TPA+ is positioned in two different orientations inside the silicalite-1 framework. Template removal occurs with a contraction in unit cell dimensions. There is a decrease in the lattice parameters of the as-synthesized silicalite-1 sample after removal of template from the framework. (C) 2007 Elsevier Inc. All rights reserved.</p>10aHTXRD10anon-isothermal kinetics10aSilicalite-11 aBhange, Deu, S.1 aPandya, N., A.1 aJha, Ratnesh, Kumar1 aRamaswamy, Veda  uhttps://library.ncl.res.in/content/non-isothermal-kinetic-studies-template-decomposition-silicalite-1-framework-high-0