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Asian Journal of Research in Chemistry
Year : 2017, Volume : 10, Issue : 3
First page : ( 251) Last page : ( 258)
Print ISSN : 0974-4169. Online ISSN : 0974-4150.
Article DOI : 10.5958/0974-4150.2017.00040.2

Kinetics of isoamyl alcohol and aniline inhibited uncatalysed and Ag (I) catalysed autoxidation of S (IV) in acidic Medium

Sharma A.K.1,*, Sharma R.2, Prasad D. S. N.1

1Department of Chemistry, Govt. P.G. College, Jhalawar-326001, Rajasthan (India)

2Department of Chemistry, S.P.C. Govt. College, Ajmer-305001, Rajasthan (India)

*Corresponding Author E-mail: sharmaarun423@gmail.com

Online published on 22 September, 2017.

Abstract

In this paper we report that isoamyl alcohol and aniline are good inhibitor for SO2 oxidation in pH range 4.02–5.25 in the presence of Ag(I). Based on the observed results following rate law given and a free radical mechanism has been proposed.

d[S(lV)]/dt = (k1+ k2[Ag(I)]) [S(lV)]/1 + B [Organics]

Experiments were carried out at 30≤T°C≤40, 4.02≤pH≤5.25, 1×10−3 mol/cm3 ≤ [S(lV)≤10×10−3 mol/cm, 5×10−6 mol/cm3 ≤[Ag(I)]≤2.5×10−5 mol/cm3, 5×10−7 mol/cm3≤[Isoamyl alcohol]≤8×10−3 mol/cm,5×10−7 mol/cm3 ≤[Aniline]≤3× 10−4 mol/cm3. Rate constants and order of reaction were calculated and found pseudo- first order in all cases. The effect of pH and temperature were also discussed. The value of apparent energy were found as 45.16 kJ mol−1 and 26.43 kJ mol−1 in the presence of isoamyl alcohol and aniline respectively.

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Keywords

Kinetics, Autoxidation, SO2, Ag(I), Catalysis, Inhibition, Isoamyl alcohol, Aniline.

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