NOPR Collection:

Effect of NaCI addition on the voltage noise characteristics during oxidation ofiron in NaNO₃-NaNO₂ melt

2016-07-20T06:38:09Z

Title: Effect of NaCI addition on the voltage noise characteristics during oxidation ofiron in NaNO₃-NaNO₂ melt Authors: Singh, I B; Venkatachari, G Abstract: Effect of NaCI addition on the oxidation of iron in NaNO₃-NaNO₂ melt at 250°C has been studied by electrochemical voltage noise analysis and harmonic current measurements. The voltage fluctuations, electrochemical noise power and oxidation rate were tend to decrease with immersion time in the NaNO₃-NaNO₂ melt due to the growth of compact oxide film. This trend was maintained even after the addition of 2% NaCl. However, a rapid increase of voltage fluctuations, noise power and oxidation rate were observed after the addition of 3% NaCI due to breakdown of the compactness of oxide film. The compact nature of oxide film and their breakdown has also been confirmed by recording power spectral density plots in particular melt system. Page(s): 163-166

Kinetics of Pb(II) adsorption by polyacrylamide grafted sawdust

2016-07-20T06:37:57Z

Title: Kinetics of Pb(II) adsorption by polyacrylamide grafted sawdust Authors: Raji, C; Anirudhan, T S Abstract: Lead (ll) removal efficiency of polyacrylamide grafted sawdust has been investigated through la-boratory experiments. Kinetic measurements have been made as a function of solution concentration of Pb(II) ions, pH and temperature. The slow step governing the rate of exchange is diffusion of ions through the exchanger particles. The equilibrium data fit well with the Langmuir isotherms. Thermodynamic parameters were also presented to predict the nature of adsorption. Adsorbent can be regenerated with acid and can then be reused. Page(s): 157-162

Reforming of Pd-lanthanide catalysts

2016-07-20T06:32:52Z

Title: Reforming of Pd-lanthanide catalysts Authors: Sita, N Mahalakshmi Abstract: The reforming reactions of cyclohexane, methyl cyclopentane and n-heptance on the Pd/ϒ-Al₂O₃ (Ln=Dy, Ho, Tm) catalysts have been investigated. The results demonstrate that Pd-Ln/ ϒ-Al₂O₃ catalysts evince high activity and stability compared to Pd/ϒ-Al₂O₃ catalysts catalysts. Owing to the different lanthanide content in the catalysts, the aromatisation and isomerization yields are different in the reforming reactions of n-heptane and cyclopentane. It is interesting to investigate the optimum content of lanthanides which gives the maximum aromatisation and isomerization yield. Page(s): 155-156

Hydroformylation of olefins catalyzed by transient montomorillonite rhodium (II) catalyst

2016-07-20T06:37:41Z

Title: Hydroformylation of olefins catalyzed by transient montomorillonite rhodium (II) catalyst Authors: Halligudi, S B Abstract: Transient [Rh^IIH(CO)(PPh₃)₂]^- 2 complex obtained by the reaction of synthesis gas with montmorillonite loaded complex [Rh(PPh₃)₃]⁺1 catalyzes the hydroformylation of allyl alcohol at 70°C and 60atm CO + H₂ (1:1) in alcoholic solvents to give > 96% yield of the linear product (L) 4-hydroxybutyraldehyde with branched (B)/linear product mole ratio 0.04. The activity of 2 is greatly influenced by the alcoholic solvents used in the hydroformylation reaction; the longer the carbon chain higher the activity of the catalyst with the loss of selectivity (B/L ratio 0.08-0.14). The activity is compared with the Wilkinson catalyst [Rh¹H(CO)(PPh₃)₂] 6 in homogeneous conditions. Complex 6 is found to be five times more reactive than 2 but with a loss of selectivity in the hydroformylation of allyl alcohol which gives 4-hydroxybutyraldehyde (65%) (B/L ratio 0.54) in ethanol. Similar observations have been found in the hydroformylation reactions of styrene, 4-chlorostyrene, cyciohexene and 1,3-butadiene to give corresponding products. Page(s): 150-154

NOPR Collection:

Effect of NaCI addition on the voltage noise characteristics during oxidation ofiron in NaNO3-NaNO2 melt

Kinetics of Pb(II) adsorption by polyacrylamide grafted sawdust

Reforming of Pd-lanthanide catalysts

Hydroformylation of olefins catalyzed by transient montomorillonite rhodium (II) catalyst

Effect of NaCI addition on the voltage noise characteristics during oxidation ofiron in NaNO₃-NaNO₂ melt