NOPR Collection:

Superoxide mediated oxidative cleavage of some electron accepting systems using tetraethylammonium bromide as phase-transfer catalyst

Fri, 01 May 1998 00:00:00 GMT

Title: Superoxide mediated oxidative cleavage of some electron accepting systems using tetraethylammonium bromide as phase-transfer catalyst Authors: Singh, Sundaram; Singh, Krishna Nand Abstract: Various electron accepting substrates have been efficiently cleaved to carboxylic acid or ketone in good yield under the mild reaction conditions of tetraethylammonium superoxide. Page(s): 175-178

Preparation of benzonitrile from methyl benzoate and ammonia catalyzed by niobium phosphate

Fri, 01 May 1998 00:00:00 GMT

Title: Preparation of benzonitrile from methyl benzoate and ammonia catalyzed by niobium phosphate Authors: Wali, Anil; Unnikrishnan, S; Pillai, S Muthukumaru; Satish, S Abstract: In a catalytic reaction under vapour phase, methyl benzoate and ammonia can be converted into benzonitrile as a major and benzamides as minor products over NbOPO₄ and few other solid acid catalysts. Page(s): 172-174

Synergistic influence of iodide ions on the inhibition of corrosion of mild steel in sulphuric acid by cyclohexylamine

Fri, 01 May 1998 00:00:00 GMT

Title: Synergistic influence of iodide ions on the inhibition of corrosion of mild steel in sulphuric acid by cyclohexylamine Authors: Muralidharan, S; Azim, S Syed; Iyer, S Venkatakrishna Abstract: The synergistic inhibition of corrosion of mild steel in 0.5 M H₂SO₄ by a combination of cyclohexylamint (CHA) and iodide ions has been studied using different electrochemical techniques. Corrosion inhibition is found to decrease with increase in the concentration of CHA. Iodide ions are found to enhance the inhibition by CHA considerably. Synergistic parameters such as S₁, and S_θ obtained from values of inhibition efficiency and surface coverage are found to be more than unity. This observation clearly shows the synergistic influence of iodide ions on the corrosion inhibition by CRA. The adsorption of CHA alone and in combination with iodide ions obeys Langmuir's adsorption isotherm. Page(s): 167-171

V₂O₅ accelerated hot corrosion of nickel in alkali sulphates melt

Fri, 01 May 1998 00:00:00 GMT

Title: V₂O₅ accelerated hot corrosion of nickel in alkali sulphates melt Authors: Singh, I B Abstract: Effect of addition of V₂O₅ on hot corrosion of nickel in alkali (Li, Na, K)₂ SO₄ melts has been studied at 550°C by electrochemical polarization method; Corrosion potential (E_corr) observation under open circuit potential (OCP) condition attributes a shift of E_corr in positive potential direction with the increase of V₂O₅ concentration in the melt. Corrosion rate (I_corr) measurement indicates an order of magnitude higher oxidation rate in presence of even 1% V₂O₅ while three orders of magnitude higher oxidation rate is noted after addition of 5 % V₂O₅ in the melt. XRD analysis of the scale identifies the presence of NiS, NiS₂, Ni(VO₃)₂ as major constituents of the scale along with other minor constituents. Page(s): 163-166

NOPR Collection:

Superoxide mediated oxidative cleavage of some electron accepting systems using tetraethylammonium bromide as phase-transfer catalyst

Preparation of benzonitrile from methyl benzoate and ammonia catalyzed by niobium phosphate

Synergistic influence of iodide ions on the inhibition of corrosion of mild steel in sulphuric acid by cyclohexylamine

V2O5 accelerated hot corrosion of nickel in alkali sulphates melt

V₂O₅ accelerated hot corrosion of nickel in alkali sulphates melt