http://nopr.niscair.res.in/handle/123456789/3073 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/3118 Title: Energetic properties of fluoranthenes <br/> <br/>Authors: Gutman, Ivan; Đurđević, Jelena; Radenković, Slavko; Burmudžija, Adrijana <br/> <br/>Abstract: Fluoranthenes form a class of polycyclic conjugated molecules, structurally very similar to benzenoid systems. They consist of two benzenoid units joined through a five-membered ring. The basic features of the structure dependence of the total π-electron energy of fluoranthenes have been established. The focus of the studies is on the joinder energy, i.e., the difference between the total π-electron energy of a fluoranthene and of its two benzenoid units. <br/> <br/>Page(s): 194-197 Thu, 29 Jan 2009 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/3117 Title: Influence of rare earths on activity and selectivity of hydrogenation of chloronitrobenzene over PtM/C (M=La, Ce, Pr, Nd and Sm) catalysts <br/> <br/>Authors: Han, Xiaoxiang <br/> <br/>Abstract: Hydrogenation of chloronitrobenzene has been studied over Pt/C and PtM/C catalysts (M= Sm, Pr, Ce, Nd and La) in ethanol at 303 K and normal pressure. The effect of substrate concentration and reaction temperature has also been investigated over PtCe/C catalyst. The hydrogenation has been carried out over Pt/C catalyst. The order of the hydrogenation of choloronitrobenzene is p>o>m, and that of the yield of chloroaniline is: p>o>m. The conversion of chloronitrobenzene is >99% and chloroaniline is the main product on hydrogenation over PtM/C catalysts. PtCe/C catalyst exhibits the best catalytic activity (TOF = 0.47 s⁻¹) and the highest yield of p-CAN (96.6 mol%). PtLa/C catalyst gives the best yield for m-chloroaniline (95.8 mol%) and o-chloroaniline (96.5 mol%). PtCe/C (0.1 wt%) catalyst exhibits good catalytic activity and stability on the hydrogenation of p-chloronitrobenzene. <br/> <br/>Page(s): 168-172 Thu, 29 Jan 2009 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/3116 Title: Structural, optical, photoluminescence and photocatalytic characteristics of sol-gel derived CeO₂-TiO₂ films <br/> <br/>Authors: Verma, Amita; Joshi, Amish G <br/> <br/>Abstract: CeO₂-TiO₂ films with different Ce/Ti mole ratios have been obtained using a simple sol-gel process. The films (1:0.25 and 1:0.5) containing more than 50% CeO₂ content show nanocrystalline characteristics. X-ray photoelectron spectroscopic study shows the variation of Ce⁴⁺/Ce³⁺ ratio with increasing TiO₂ content. Films with greater CeO₂ content exhibit higher porosity. The observed photoluminescence in the films is attributed to various defects resulting from crystallization and also to the relative amount of Ce³⁺ in the mixed oxide matrix. The transparency in the films appears to be inversely related to their photoluminescence activity, since the 1:0.5 film, which exhibits the best photoluminescence response, is incidentally also the least transparent film. The presence of photocatalytic activity in these films shows their potential use as an efficient photocatalyst. <br/> <br/>Page(s): 161-167 Thu, 29 Jan 2009 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/3115 Title: Numerical modelling and simulation of Koutecky-Levich equation for NADH electrocatalytic oxidation at graphite electrodes modified with a new polymeric phenothiazine <br/> <br/>Authors: Unguresan, Mihaela Ligia; Gligor, Delia Maria <br/> <br/>Abstract: A mathematical model has been developed for the electrocatalytic NADH oxidation process taking place at graphite electrodes modified with a polymer of phenothiazine formaldehyde. The electrocatalytic rate constants (kobs) have been obtained from rotating disk electrode experiments, at various concentrations of NADH and pH values of the supporting electrolyte. Using the method of linear regression, the kinetic parameters kobs[NADH]₌₀, k₊₂ and KM have been determined. Based on the results obtained, the numerical simulation of these parameters corresponding to electrocatalytic oxidation of NADH, using the modified graphite electrode, has been obtained. The experimental data overlap almost perfectly with the mathematical and numerical simulated data, proving the validity of the model. <br/> <br/>Page(s): 206-210 Thu, 29 Jan 2009 22:58:59 GMT