@article { ISI:000230434500007, title = {Synthesis of high silica content silicoaluminophosphate-5 (SAPO-5) from non-aqueous medium using hexamethyleneimine template}, journal = {Journal of Scientific \& Industrial Research}, volume = {64}, number = {7}, year = {2005}, month = {JUL}, pages = {509-514}, publisher = {NATL INST SCIENCE COMMUNICATION}, type = {Article}, address = {DR K S KRISHNAN MARG, NEW DELHI 110 012, INDIA}, abstract = {

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.

}, keywords = {aqueous, FT-IR, hydroxyl region, non-aqueous, SAPO-5, SEM, TG/DTA, XRD}, issn = {0022-4456}, author = {Venkatathri, N} } @article { ISI:000239869200004, title = {Synthesis, characterization and catalytic properties of vanadium aluminophosphate molecular sieves VAPO-31 and VAPSO-Amr from non-aqueous media}, journal = {Applied Catalysis A-General}, volume = {310}, year = {2006}, month = {AUG}, pages = {31-39}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Vanadium samples containing aluminophosphate molecular sieve (VAPO-31) and amorphous vanadium silicoaluminophosphate (VAPSO-Amr) have been synthesized using hexamethyleneimine template from non-aqueous media for the first time. XRD and SEM analyses confirm the phase purity of the synthesized samples. FT-IR analysis suggests the incorporation of V4+ in the aluminophosphate framework. ESR, UV-vis spectroscopic, and XPS techniques and cyclicvoltametric studies confirm the incorporation of vanadium and reveal its presence in tetrahedral and square pyramidal environments in the as-synthesized samples. Cyclic voltammetry reveals the presence of two redox couples in VAPO-31. This catalyst is found to be a good oxidation catalyst. Although most of the properties of VAPO-31NA and VAPSO-Amr are similar, the latter can access more vanadium and V4+ ions. Compared to aqueous media samples, it can incorporate more vanadium especially V5+, ions and has been found to be better oxidation catalyst. The physicochemical properties also change with media. (C) 2006 Elsevier B.V. All rights reserved.

}, keywords = {cyclic voltammetry, ESR, FT-IR, MAS NMR, non-aqueous, SEM, TG/DTA, UV-Vis, VAPO-31, XPS, XRD}, issn = {0926-860X}, doi = {10.1016/j.apcata.2006.05.001}, author = {Venkatathri, N.} } @article {46362, title = {Improving the energy density of Li-ion capacitors using polymer-derived porous carbons as cathode}, journal = {Electrochimica Acta}, volume = {130}, year = {2014}, month = {JUN }, pages = {766-770}, type = {Article}, abstract = {

High energy density Li-ion hybrid electrochemical capacitors (Li-HEC) are fabricated with 3 D architectured high surface area porous carbon (HSPC) derived from the poly(acrylamide-co-acrylic acid) potassium salt in a single step without any activating agent. The obtained HSPC exhibits high specific surface area of 1490 m(2) g(-1) and characterized with several analytical techniques. Li-HEC is fabricated with insertion type Li4Ti5O12 anode by adjusting the mass balance based on the single electrode performance with Li. The Li-HEC delivered the maximum energy density of similar to 55 Wh kg(-1), which is much higher than commercially available activated carbon (similar to 36 Wh kg(-1)). Further HSPC based Li-HEC delivered excellent cycleability and rendered similar to 87\% of initial value after 2000 cycles. (C) 2014 Elsevier Ltd. All rights reserved.

}, keywords = {energy density, Li-ion hybrid electrochemical capacitors, non-aqueous, porous carbon}, issn = {0013-4686}, doi = {10.1016/j.electacta.2014.03.079}, author = {Puthusseri, Dhanya and Aravindan, Vanchiappan and Madhavi, Srinivasan and Ogale, Satishchandra} }