Praveen Kumar
Articles written in Journal of Chemical Sciences
Volume 116 Issue 6 November 2004 pp 311-317 Full Papers
K V P Pa Van Kumar K Praveen Kumar M Vijjulatha K C Kumara Swamy
The compounds S(6-
Volume 118 Issue 6 November 2006 pp 495-501
K C Kumara Swamy E Balaraman M Phani Pavan N N Bhuvan Kumar K Praveen Kumar N Satish Kumar
The diversity of products in the reaction of diethyl azodicarboxylate (DEAD)/diisopropyl azodicarboxylate (DIAD) and activated acetylenes with PIII compounds bearing oxygen or nitrogen substituents is discussed. New findings that are useful in understanding the nature of intermediates involved in the Mitsunobu reaction are highlighted. X-ray structures of two new compounds (2-
Volume 119 Issue 5 September 2007 pp 441-447
Controlling dynamics in diatomic systems
Controlling molecular energetics using laser pulses is exemplified for nuclear motion in two different diatomic systems. The problem of finding the optimized field for maximizing a desired quantum dynamical target is formulated using an iterative method. The method is applied for two diatomic systems, HF and OH. The power spectra of the fields and evolution of populations of different vibrational states during transitions are obtained.
Volume 128 Issue 4 0000 pp 649-656 Regular Articles
Co-catalyst free Titanate Nanorods for improved Hydrogen production under solar light irradiation
N LAKSHMANA REDDY D PRAVEEN KUMAR M V SHANKAR
Harnessing solar energy for water splitting into hydrogen $ (H_{2})$ and oxygen $(O_{2})$ gases in the presenceof semiconductor catalyst is one of the most promising and cleaner methods of chemical fuel $ (H_{2})$ production.Herein, we report a simplified method for the preparation of photo-active titanate nanorods catalystand explore the key role of calcination temperature and time period in improving catalytic properties. Bothas-synthesized and calcined material showed rod-like shape and trititanate structure as evidenced from crystalstructure and morphology analysis. Notably, calcination process affected both length and diameter of thenanorods into shorter and smaller size respectively. In turn, they significantly influenced the band gap reduction,resulting in visible light absorption at optimized calcination conditions. The calcined nanorods showedshift in optical absorption band edge towards longer wave length than pristine nanorods. The rate of hydrogengeneration using different photocatalysts was measured by suspending trititanate nanorods (in the absence ofco-catalyst) in glycerol-water mixture under solar light irradiation. Among the catalysts, nanorods calcined at$250^{0}C$ for 2 hours recorded high rate of H2 production and stability confirmed for five cycles. Photocatalyticproperties and plausible pathway responsible for improved H2 production are discussed in detail.
Volume 135, 2023
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