@article { ISI:000261275000005, title = {Non-phosgene route for the synthesis of methyl phenyl carbamate using ordered AISBA-15 catalyst}, journal = {Journal of Molecular Catalysis A-Chemical}, volume = {295}, number = {1-2}, year = {2008}, month = {NOV}, pages = {29-33}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Methyl phenyl carbamate (MPC) has been synthesized Under liquid phase conditions from dimethyl carbonate and aniline by using mesoporous AISBA-15 catalyst. The catalyst with different Si/Al ratio was synthesized by isomorphous Substitution of aluminium into the framework of siliceous SBA-15. The structural integrity of the catalyst system was diagnosed with the help of various characterization techniques Such as X-ray diffraction, Surface analysis, and the acidity measurement has been done by TPD using ammonia as probe molecule. AISBA-15 (Si/Al = 10) exhibited highest catalytic activity in the synthesis of MPC under the reaction Conditions Studied. The effect of parameters Such as molar ratio of reactants, catalyst concentration. reaction temperature and time on the conversion of aniline was investigated. The results demonstrated that an aniline conversion of 99\% and MPC selectivity of 71\% were achieved when the reaction was carried out at 100 C, DMC to aniline mole ratio of 10 with 5\% of catalyst (wt\% of total reaction mixture) for 3 h. (c) 2008 Elsevier B.V. All rights reserved.

}, keywords = {amines, Dimethyl carbonate, Mesoporous AISBA-15, Methoxycarbonylation, Methyl phenyl carbamate}, issn = {1381-1169}, doi = {10.1016/j.molcata.2008.08.009}, author = {Lucas, Nishita and Amrute, Amol P. and Palraj, K. and Shanbhag, G. V. and Vinu, Ajayan and Halligudi, Shivaraj B.} } @article { ISI:000334895800011, title = {Novel catalysts for valorization of biomass to value-added chemicals and fuels}, journal = {Journal of Chemical Sciences}, volume = {126}, number = {2, SI}, year = {2014}, note = {21st National Symposium on Catalysis (CATSYMP), CSIR Indian Inst Chem Technol, Hyderabad, INDIA, FEB 11-13, 2013}, month = {MAR}, pages = {403-413}, publisher = {Catalysis Soc India}, address = {C V RAMAN AVENUE, SADASHIVANAGAR, P B \#8005, BANGALORE 560 080, INDIA}, abstract = {

Key furan compounds such as 5-hydroxymethylfurfural (HMF), 2,5-furandicarboxylic acid (FDCA) and 2,5-dimethylfuran (DMF) were synthesized from renewable feedstocks. Dehydration of fructose was carried out in biphasic conditions employing several solid acid catalysts by targeting selective formation of HMF. Its selectivity is linearly dependent on total acidity clearly revealing that lower acidity favours selective formation of HMF. Oxidation and hydrogenolysis of HMF has been explored using 2 wt\% Ru-K-OMS-2. The catalysts used for each transformation were subjected to detailed characterization using XRD, BET surface area, temperature-programmed desorption and transmission electron microscopy. The effect of various reaction parameters was also investigated for obtaining high yields of desired chemical intermediates. High FDCA yields of 93.4 mol\% and 66 mol\% were achieved in alkaline and base-free conditions, respectively. The 2 wt\% Ru-K-OMS-2 is a versatile catalyst as it also catalyses HMF hydrogenolysis giving 33 mol\% of DMF. Thus, utility of various novel materials as catalysts has been demonstrated in the multistep transformations of hexoses to furan-based fuels and chemicals.

}, keywords = {2, 5-dimethylfuran, 5-furan dicarboxylic acid, 5-hydroxymethyl furfural, dehydration, fructose}, issn = {0974-3626}, author = {Lucas, Nishita and Kanna, Narasimha Rao and Nagpure, Atul S. and Kokate, Ganesh and Chilukuri, Satyanarayana V.} } @article {46805, title = {Novel Ru nanoparticle catalysts for the catalytic transfer hydrogenation of biomass-derived furanic compounds}, journal = {Sustainable Energy \& Fuels}, volume = {4}, year = {2020}, month = {JUL }, pages = {3654-3667}, type = {Article}, abstract = {

The catalytic transfer hydrogenation (CTH) reaction was investigated for boosting the reduction of biomass-derived furanic compounds to obtain high-quality liquid biofuels. The CTH of 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF) and furfural to 2-methylfuran (MF) was thoroughly studied over the Ru, Pd, Au, Pt, Ni, Rh and Cu metal catalysts supported on nitrogen-doped mesoporous carbons (NMCs) by utilizing 2-propanol as a source of hydrogen. The structural characteristics of the materials were examined by employing various physico-chemical methods, such as XRD, N(2)sorption, CHN analysis, XPS, FT-IR spectroscopy, H-2-TPR, TEM, CO2-TPD, ICP-OES and Raman spectroscopy. The influence of the N content, basicity of the catalyst, reaction temperature, hydrogen donor, nature of the catalyst support and transition metal was systematically investigated with regard to the substrate conversions and product yields. The correlation between the N content (wt\%) of the catalysts and the Ru nanoparticle size (nm) and turnover frequency (h(-1)) was also investigated. Highly dispersed Ru nanoparticles (1.9 nm) supported on NMC displayed admirable catalytic performance in CTH for the conversion of HMF to DMF and furfural to MF. The catalyst Ru-NMC with a good N content (11.4 wt\%) gave 84 and 87 mol\% yields of DMF and MF, respectively, with 2-propanol as the source of hydrogen under mild reaction conditions. In addition, this catalyst demonstrated excellent recyclability. The better catalytic activity of the Ru-NMC catalyst in the CTH of HMF and furfural was credited to the small size of the Ru metal nanoparticles (1.9 nm), high N content, superior metal-support interaction and mesoporous framework of the catalyst.

}, issn = {2398-4902}, doi = {10.1039/d0se00361a}, author = {Nagpure, Atul S. and Gogoi, Pranjal and Lucas, Nishita and Chilukuri, V. Satyanarayana} }