@article { ISI:000239739400011, title = {Promoter induced rapid synthesis of AlPO4-5 molecular sieve in non-aqueous media using hexamethyleneimine template}, journal = {Journal of the Indian Chemical Society}, volume = {83}, number = {7}, year = {2006}, month = {JUL}, pages = {692-696}, publisher = {INDIAN CHEMICAL SOC}, type = {Article}, address = {92 ACHARYA PRAFULLA CHANDRA RD ATTN:DR INDRAJIT KAR/EXEC SEC, CALCUTTA 700009, INDIA}, abstract = {

AlPO4-5 have been synthesized from non-aqueous media using hexamethyleneimine template in presence of sodium ions. The results show that the sodium catalyses the nucleation and crystallization process of the formation of AlPO4-5 molecular sieve. The material synthesized was characterized by XRD, SEM, carbon and nitrogen analysis, TG/DTA, FT-IR, Al-27 and P-31 MASNMR. The results show that the samples are highly crystalline. The presence of octahedral and tetrahedral sites are observed in 27 At MASNMR, P-31 MASNMR gives only a single peak for tetrahedral phosphorous atoms.

}, keywords = {aluminophosphates, Molecular sieve, non-aqueous media}, issn = {0019-4522}, author = {Venkatathri, N.} } @article { ISI:000239739400012, title = {Synthesis and characterization of AlPO4-5RT molecular sieve at room temperature}, journal = {Journal of the Indian Chemical Society}, volume = {83}, number = {7}, year = {2006}, month = {JUL}, pages = {697-701}, publisher = {INDIAN CHEMICAL SOC}, type = {Article}, address = {92 ACHARYA PRAFULLA CHANDRA RD ATTN:DR INDRAJIT KAR/EXEC SEC, CALCUTTA 700009, INDIA}, abstract = {

Aluminophosphate molecular sieve AlPO4-5RT (AlPO4-5, prepared at room temperature) have been synthesized using hexamethyleneimine template at room temperature for the first time. Gel composition Al2O3 : P2O5 : 1.16HEM : 45H(2)O aging for 12 h at room temperature, and in 24 h, 473 K are the standard reaction conditions for synthesis of AlPO4-5. Studies on above gel composition at room temperature shows the presence of AlPO4-5 crystals. Both the aluminophosphates have been characterized by elemental analysis, XRD, SEM, FT-IR, TG/DTA, and C-13, Al-27 and P-31 MASNMR techniques. XRD analysis of AlPO4-5RT shows that the presence of low intensed pseudobochmite sample. SEM shows the morphology nanosized crystals along with platelets. TG/DTA analysis reveals the presence of maximum five stages elimination of templates. Carbon and nitrogen analysis shows that the presence of four template molecules per unitcell. C-13 MASNMR analysis shows the interaction of template with structure of the framework. Al-27 MASNMR shows the presence of small amount of octahedral co-ordination besides the rest are in tetrahedral co-ordination. P-31 MASNMR shows the presence of two environmentally different tetrahedrally co-ordinated phosphorous atoms.

}, keywords = {Aluminophosphate, Molecular sieve}, issn = {0019-4522}, author = {Venkatathri, N.} } @article { ISI:000239739400010, title = {Synthesis of high alumina ZSM-5 molecular sieve with ethylene diamine as template}, journal = {Journal of the Indian Chemical Society}, volume = {83}, number = {7}, year = {2006}, month = {JUL}, pages = {686-691}, publisher = {INDIAN CHEMICAL SOC}, type = {Article}, address = {92 ACHARYA PRAFULLA CHANDRA RD ATTN:DR INDRAJIT KAR/EXEC SEC, CALCUTTA 700009, INDIA}, abstract = {

Attempts were made to investigate compositional constraints in the synthesis of pentasill molecular sieves, including aluminosilicate zeolites using ethylene diamine (C2DN) template, from the gel composition 1.85Na(2)O : aAl(2)O(3) : 15.2SiO(2) : 592H(2)O : 19.7C(2)DN in the temperature 177 degrees C for ten days. When a = 0.25 the product was ZSM-5 and then a = 1 the product was ZSM-35 and in between compositions the mixture of two were obtained. Reduce the time of crystallization time to 5 days give nanocrystalline material. XRD and FT-IR spectra in framework region of ZSM-5 synthesized using ethylene diamine template and without template are having similar pattern, however the intensity varies. Scanning electron microscopic picture of the both are varies. The structural stability of the zeolite ZSM-5 synthesized using no template was also found to be lower as compared with that for the ZSM-5 synthesized using ethylene diamine template. These differences. may result from the occluded excess sodium.

}, keywords = {ethylenediamine, Molecular sieve, zeolite}, issn = {0019-4522}, author = {Venkatathri, N.} }