02018nas a2200157   4500008004100000022001400041245010900055210006900164260010600233300001400339490000700353520134400360653000801704100001901712856012901731       2005                        eng d  a0025-540800aSynthesis and NMR characterization of SAPO-35 from non-aqueous systems using hexamethyleneimine template0 aSynthesis and NMR characterization of SAPO35 from nonaqueous sys  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcJUL  a1157-11650 v403 a<p>SAPO-35 was synthesized using hexamethyleneimine template in non-aqueous systems. X-ray diffraction and scanning electron micrograph analysis shows the synthesized sample is pure and well crystalline. Presence of four stages (1.6%, 0.8%, 7.8% and 8.4%) of weight loss is observed by TG/DTA analysis. FT-IR analysis in the framework region shows the presence of tetrahedral T-O-T vibrations is similar to the other known aluminophosphate molecular sieves. FT-IR spectrum in the -OH region shows stretching vibrations at 3631, 3604 and 3580 cm(-1) can be assigned to OH groups in bigger cages near S6R, in bigger cages near D6R and those actually confined inside the D6R, respectively. The spectra for the as-synthesized sample show a single symmetrical Al-27 MAS NMR line at delta = 36.26 indicating the presence of a single tetrahedral aluminium species. Where as Si-29 and P-31 MAS NMR shows the presence of two peaks in both at (-89.9 and -95.15 ppm) and (-34.01 and -40.45 ppm) due to the Si substitution of P present in two different locations in double 6 ring (D6R) and in single 6 ring (S6R). Al-27 3Q-MAS NMR shows two peaks for environmentally different tetrahedral aluminium atoms. This is the first time we are showing such a fact which is not observable using ordinary MAS NMR. (c) 2005 Elsevier Ltd. All rights reserved.</p>10aXRD1 aVenkatathri, N  uhttps://library.ncl.res.in/content/synthesis-and-nmr-characterization-sapo-35-non-aqueous-systems-using-hexamethyleneimine-001415nas a2200241   4500008004100000022001400041245012900055210006900184260008900253300001200342490000700354520056900361653001200930653001000942653002000952653001600972653001100988653000800999653001101007653000801018100001901026856012801045       2005                        eng d  a0022-445600aSynthesis of high silica content silicoaluminophosphate-5 (SAPO-5) from non-aqueous medium using hexamethyleneimine template0 aSynthesis of high silica content silicoaluminophosphate5 SAPO5 f  aDR K S KRISHNAN MARG, NEW DELHI 110 012, INDIAbNATL INST SCIENCE COMMUNICATIONcJUL  a509-5140 v643 a<p>Silicoaluminophosphate-5 (SAPO-5) molecular sieve with up to 2.4 Si atom per unit cell have been synthesized using hexamethyleneimine template in ethylene glycol medium (molar ratio of silica in the reaction gels up to 0.3). Crystallinity and silicon incorporation are confirmed by XRD, XRF, N, sorption study, TG/DTA, SEM. pyridine TPD technique and hydroxyl region FT-IR. These materials with high Si concentration show higher activity for toluene alkylation reaction than samples prepared with up to 0.1 molar ratio of silica in the gel of aqueous media.</p>10aaqueous10aFT-IR10ahydroxyl region10anon-aqueous10aSAPO-510aSEM10aTG/DTA10aXRD1 aVenkatathri, N  uhttps://library.ncl.res.in/content/synthesis-high-silica-content-silicoaluminophosphate-5-sapo-5-non-aqueous-medium-using-0