Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Dhanashri P. Sawant is active.

Publication


Featured researches published by Dhanashri P. Sawant.


Angewandte Chemie | 2009

Highly Ordered Mesoporous Carbon Nitride Nanoparticles with High Nitrogen Content: A Metal‐Free Basic Catalyst

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

Heteropoly Acid Encapsulated SBA-15/TiO2 Nanocomposites and Their Unusual Performance in Acid-Catalysed Organic Transformations

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

Benzylation of benzene and other aromatics by benzyl chloride over mesoporous AlSBA-15 catalysts

Ajayan Vinu; Dhanashri P. Sawant; Katsuhiko Ariga; Martin Hartmann; Shivappa B. Halligudi


Catalysis Communications | 2008

Synthesis of biodiesel over zirconia-supported isopoly and heteropoly tungstate catalysts

G. Sunita; Biju M. Devassy; Ajayan Vinu; Dhanashri P. Sawant; Veerappan V. Balasubramanian; S.B. Halligudi


Chemistry of Materials | 2007

Three-dimensional cage type mesoporous CN-based hybrid material with very high surface area and pore volume

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

Formation of nanosized zirconia-supported 12-tungstophosphoric acid in mesoporous silica SBA-15: a stable and versatile solid acid catalyst for benzylation of phenol

Dhanashri P. Sawant; Ajayan Vinu; Nalini E. Jacob; Frédéric Lefebvre; S.B. Halligudi


Advanced Functional Materials | 2008

Novel Three Dimensional Cubic Fm3m Mesoporous Aluminosilicates with Tailored Cage Type Pore Structure and High Aluminum Content

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

Catalytic performances of silicotungstic acid/zirconia supported SBA-15 in an esterification of benzyl alcohol with acetic acid

Dhanashri P. Sawant; Ajayan Vinu; Josena Justus; Pavuluri Srinivasu; S.B. Halligudi


Journal of Molecular Catalysis A-chemical | 2007

Tungstophosphoric acid supported over zirconia in mesoporous channels of MCM-41 as catalyst in veratrole acetylation

Dhanashri P. Sawant; Ajayan Vinu; Frédéric Lefebvre; S.B. Halligudi


Microporous and Mesoporous Materials | 2008

Hexagonally ordered mesoporous highly acidic AlSBA-15 with different morphology: An efficient catalyst for acetylation of aromatics

Ajayan Vinu; Josena Justus; Chokkalingam Anand; Dhanashri P. Sawant; Katsuhiko Ariga; Toshiyuki Mori; Pavuluri Srinivasu; Veerappan V. Balasubramanian; Sivan Velmathi; Sher Alam

Collaboration


Dive into the Dhanashri P. Sawant's collaboration.

Top Co-Authors

Avatar

Ajayan Vinu

University of Newcastle

View shared research outputs
Top Co-Authors

Avatar

Veerappan V. Balasubramanian

National Institute for Materials Science

View shared research outputs
Top Co-Authors

Avatar

Pavuluri Srinivasu

National Institute for Materials Science

View shared research outputs
Top Co-Authors

Avatar

Katsuhiko Ariga

National Institute for Materials Science

View shared research outputs
Top Co-Authors

Avatar

Josena Justus

National Institute for Materials Science

View shared research outputs
Top Co-Authors

Avatar

Sher Alam

National Institute for Materials Science

View shared research outputs
Top Co-Authors

Avatar

Toshiyuki Mori

National Institute for Materials Science

View shared research outputs
Top Co-Authors

Avatar

Shivappa B. Halligudi

National Institute for Materials Science

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Sivan Velmathi

National Institute of Technology

View shared research outputs
Researchain Logo
Decentralizing Knowledge