Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Dynamics of Autoxidation of Aqueous Sulfur Dioxide in Aqueous Suspensions of Cadmium Oxide
Ashu RaniD. S. N. PrasadRachna BhargavaKrishna Swarup Gupta
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1991 Volume 64 Issue 6 Pages 1955-1961

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Abstract

Autoxidation of S(IV), in buffered solutions,conforms the rate law (1). The increase in buffer concentration has a
Robsd=k5[CdO][S(IV)]2[H+]−1.22 (1)
rate decreasing effect. On the other hand, in unbuffered solutions the kinetics obey a different rate law (2).
Robsd=(k10+k11[CdO])[S(IV)][H+]−0.5 (2)
In both situations, the dissolution of CdO accompanies the autoxidation. A heterogeneous catalytic mechanism involving adsorption of both dioxygen and sulfur(IV) on the surface of CdO particle has been proposed.

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