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Materials of the conference "EDUCATION AND SCIENCE WITHOUT BORDERS"
PDFWe have found that there is materialized sulfur oxide oxidation by oxygen on ultrasonic field in mild conditions (20-30°C) in the presence of cobalt complexes, which immobilized on polyacrylic acid.
Laboratory equipment for researching of sonochemical reactions is submitted in [1].
Cobalt complexes aqueous solutions have pH in the region of 7-8. In this pH region SO2 exists in the SO32- form, that is why as a source of SO2 was taken Na2SO3. Also for optimization of gas cleaning conditions from SO2 was used reaction (1):
2 Nа2SО3 + О2 → 2 Nа2SО4 (1)
Oxidation reaction of sodium sulfite by oxygen in the presence of cobalt complexes, which fixed on polyacrylic acid, was researched by us earlier [2].
There was shown that in 
interval from 10-3 to 10-2 mole/l rate of Na2SO3 oxidation by oxygen is described with this equation:
(2)
where k1 and k2 – the partial rate constants, that characterized mononuclear and binuclear cobalt complexes; α1 and α2 – the equilibrium constants:
(3)
(4)
Calculated kinetic and thermodynamic constants in the presence of ultrasound are given below:
|
|
k1, л/моль×с |
k2, л/моль×с |
a1, л/моль |
a2, л/моль |
|
With ultrasound |
2,3×10-5 |
1,4×10-3 |
4×104 |
2,5×103 |
|
Without ultrasound |
3,3×10-4 |
1,3×10-4 |
1,98 |
3,3 |
It is important to say that in the ultrasound presence formation constant of binuclear cobalt complexes, which fixed on PAA, higher to three order and rate constant higher to one order than when without ultrasound.
[2] V. S. Yemelyanova, Uldasheva G.A., Jubanov K.A., Sarmurzina A.G., Karamurzin B.O., T.V.Shakieva, Turdykulova A.K. Effect of acetonitrile for the oxidation of sulfur dioxide in the presence of oxygen attached to a polyacrylic acid complexes of cobalt // KazNU Messenger. Chemical Series: -2004, №4(36), p. 139 – 143
Emelyanova V.S., T.V. Shakieva, Zh.K. Kaiyrbekov, B. Dosumova, U. Dzhatkambayeva, ZH.K. Myltykbaeva, D.Zh. Mukhitova ULTRASOUND’S EFFECT ON KINTEICS OF THE SULFER DIOXIDE OXYIDATION BY OXYGEN IN THE PRESENCE OF POLIMERMETALLIC CATALYST. International Journal Of Applied And Fundamental Research. – 2013. – № 2 –
URL: www.science-sd.com/455-24245 (22.12.2024).