Authors:Shailja Arora, Pratibha Kapoor, and Madan Singla
In this study, a high catalytic activity of palladium nanoparticles immobilized on alumina (Al2O3) is reported for the industrially important reduction of aromatic nitro compounds to amino compounds. The palladium nanoparticles
were immobilized on alumina by a simple physical precipitation method. The synthesis of palladium nanoparticles was done in
ethylene glycol without using any external stabilizing agent. The composite particles exhibited good colloidal stability.
The catalytic activity is investigated qualitatively by high performance liquid chromatography (HPLC) and quantitatively by
photometrically monitoring the reduction of p-nitrophenol by an excess of sodium borohydride (NaBH4) in the presence of nanocomposites. The kinetic data could be explained by the assumption of pseudo first-order reaction
with respect to p-nitrophenol.
Authors:Pratibha Srivastava, Inder Kapoor, Gurdip Singh, and Roland Fröhlich
Phenylenediammonium dibromide (PDADBr) salts have been prepared and characterized by X-ray crystallography. The thermal decomposition
of PDADBr has been studied by thermogravimetry (TG) and differential thermal analysis (DTA). Kinetic parameters have been
evaluated using model fitting and isoconversional methods. The thermolytic pathways have also been suggested which involve
proton transfer as a primary step to regenerate parent amine and HBr. Interaction between amine and HBr at higher temperature
yields gaseous products.