Indian Institute of Technology Guwahati

About: Indian Institute of Technology Guwahati is a education organization based out in Guwahati, Assam, India. It is known for research contribution in the topics: Catalysis & Computer science. The organization has 6933 authors who have published 17102 publications receiving 257351 citations.

Simulation of Natural Convection in the Presence of Volumetric Radiation Using the Lattice Boltzmann Method

Abstract: This article deals with the application of the lattice Boltzmann method (LBM) to the analysis of natural convection in the presence of volumetric radiation in a square cavity containing an absorbing, emitting, and scattering medium. Separate particle distribution functions in the LBM are used to calculate the density and velocity fields and the thermal field. The radiative term of the energy equation is computed using the finite-volume method. Streamlines, isotherms, and Nusselt number are analyzed for the effects of different parameters such as Rayleigh number, convection-radiation parameter, extinction coefficient, and scattering albedo.

Effect of cationic and anionic solid polymer electrolyte on direct electrochemical reduction of gaseous CO2 to fuel

Abstract: The electrochemical reduction of carbon dioxide in the gaseous phase was investigated using cationic and anionic solid polymer electrolytes. Influence of solid polymer electrolyte medium on electrochemical reduction of gaseous CO2 into fuel is studied. The electrodeposited Cu2O on porous carbon paper was used as cathode whereas Pt/C on the carbon paper was used as anode. The products formed after the electrochemical reduction of carbon dioxide were analyzed by gas chromatography and high performance liquid chromatography. Experiments were carried out at room temperature and atmospheric pressure. Mainly methane, ethylene, and methanol were formed as products apart from the undesired hydrogen gas as a by-product. It has been found that anionic solid electrolyte was more favorable than cationic solid electrolyte. Faradaic efficiency for the conversion of CO2 into products was more than 45% using anionic solid polymer membrane at 2.5 V and 5.4 mA cm−2.

Palladium-Catalyzed One-Pot Conversion of Aldehydes to Amides

Abstract: The palladium-catalyzed one-pot conversion of aldehydes into primary amides in the presence of hydroxylamine hydrochloride in aqueous dimethyl sulfoxide (DMSO) at moderate temperature is described. The process is selective and free from the addition of an external chelating ligand.

Enhancement of Cellulase Activity from a New Strain of Bacillus subtilis by Medium Optimization and Analysis with Various Cellulosic Substrates.

Abstract: The cellulase activity of Bacillus subtilis AS3 was enhanced by optimizing the medium composition by statistical methods. The enzyme activity with unoptimised medium with carboxymethylcellulose (CMC) was 0.07 U/mL and that was significantly enhanced by CMC, peptone, and yeast extract using Placket-Burman design. The combined effects of these nutrients on cellulase activity were studied using 22 full factorial central composite design. The optimal levels of medium components determined were CMC (1.8%), peptone (0.8%), and yeast extract (0.479%). The maximum enzyme activity predicted by the model was 0.49 U/mL which was in good agreement with the experimental value 0.43 U/mL showing 6-fold increase as compared to unoptimised medium. The enzyme showed multisubstrate specificity, showing significantly higher activity with lichenan and β-glucan and lower activity with laminarin, hydroxyethylcellulose, and steam exploded bagasse. The optimised medium with lichenan or β-glucan showed 2.5- or 2.8-fold higher activity, respectively, at same concentration as of CMC.