Dhanashri P. Sawant
National Institute for Materials Science
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Publication
Featured researches published by Dhanashri P. Sawant.
Angewandte Chemie | 2009
Xin Jin; Veerappan V. Balasubramanian; Sakthivel Tamil Selvan; Dhanashri P. Sawant; Murugulla A. Chari; Gao Qing Lu; Ajayan Vinu
Nitrogen-rich carbon nitride is obtained as ultrasmall, discrete, mesoporous nanoparticles (see picture) by reaction of ethylenediamine with CCl in the nanochannels of a mesoporous silica template. Its high nitrogen content, large surface area, and large pore volume make it a highly active catalyst for transesterification of β-keto esters of aryl, aliphatic, and cyclic primary alcohols.
Chemistry: A European Journal | 2008
Dhanashri P. Sawant; Josena Justus; Veerappan V. Balasubramanian; Katsuhiko Ariga; Pavuluri Srinivasu; Sivan Velmathi; Shivappa B. Halligudi; Ajayan Vinu
The preparation of SBA-15/TiO(2) nanocomposites with different loadings of Keggin-type 12-tungstophosphoric acid (TPA) nanocrystals in their mesochannels through a simple and effective vacuum impregnation method is reported for the first time. The catalysts have been characterised by various sophisticated techniques, including XRD, HRSEM, and TEM. It has been found that the acidity and the textural parameters of the nanocomposites can be controlled by simply changing the loadings of TPA and TiO(2) or the calcination temperature. TPA and TiO(2) loadings of 15 and 22.4 wt %, respectively, and a calcination temperature of 1123 K have proved to be optimal for obtaining mesoporous nanocomposite materials with the highest acidity. Moreover, the activities of these catalysts in promoting hydroamination as well as Mannich and Claisen rearrangement reactions have been extensively investigated. The results show that the amount of TPA has a great influence on the activity of the nanocomposites in all of the reactions studied. The effects of other reaction parameters, such as temperature and reaction time, on the conversion and product selectivity have also been studied in detail. A kinetic analysis of the formation of the products under various reaction conditions is presented. It has been found that the activity of the nanocomposite composed of 15 wt % TPA deposited on 22.4 wt of TiO(2) on SBA-15 in promoting the studied reaction is remarkably higher than the catalytic activities shown by pure TPA, TiO(2)-loaded SBA-15, or TPA-loaded SBA-15. The results obtained have indicated that the acidity and the structural control of the nanocomposite materials are highly critical for obtaining excellent catalytic activity, and the presented highly acidic nanocomposites are considered to show great potential for use as catalysts in promoting many acid-catalysed organic transformations.
Microporous and Mesoporous Materials | 2005
Ajayan Vinu; Dhanashri P. Sawant; Katsuhiko Ariga; Martin Hartmann; Shivappa B. Halligudi
Catalysis Communications | 2008
G. Sunita; Biju M. Devassy; Ajayan Vinu; Dhanashri P. Sawant; Veerappan V. Balasubramanian; S.B. Halligudi
Chemistry of Materials | 2007
Ajayan Vinu; Pavuluri Srinivasu; Dhanashri P. Sawant; Toshiyuki Mori; Katsuhiko Ariga; Jong San Chang; Sung Hwa Jhung; Veerappan V. Balasubramanian; Young Kyu Hwang
Journal of Catalysis | 2005
Dhanashri P. Sawant; Ajayan Vinu; Nalini E. Jacob; Frédéric Lefebvre; S.B. Halligudi
Advanced Functional Materials | 2008
Pavuluri Srinivasu; Sher Alam; Veerappan V. Balasubramanian; Sivan Velmathi; Dhanashri P. Sawant; Winfred Böhlmann; Subhash P. Mirajkar; Katsuhiko Ariga; Shivappa B. Halligudi; Ajayan Vinu
Journal of Molecular Catalysis A-chemical | 2007
Dhanashri P. Sawant; Ajayan Vinu; Josena Justus; Pavuluri Srinivasu; S.B. Halligudi
Journal of Molecular Catalysis A-chemical | 2007
Dhanashri P. Sawant; Ajayan Vinu; Frédéric Lefebvre; S.B. Halligudi
Microporous and Mesoporous Materials | 2008
Ajayan Vinu; Josena Justus; Chokkalingam Anand; Dhanashri P. Sawant; Katsuhiko Ariga; Toshiyuki Mori; Pavuluri Srinivasu; Veerappan V. Balasubramanian; Sivan Velmathi; Sher Alam