A model to Unni's experiments on cyclic catalytic oxidation of SO2

✍ Scribed by A.K. Jain; R.R. Hudgins; P.L. Silveston

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 170 KB
• Volume: 36
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(81)80077-2

✦ Synopsis

Letters to the Editors 233 towards steady or quasi-steady state, cyclic surface concenmentally by Jain ef uLI41. but it fails to predict the long-term tration approaches the non-cyclic surface concentration. advantage of cyclic operation. It is necessary to use cycling periods of about 4tXtO set before the surface concentration begins to follow the changes in the bulk concentration, exhibiting maxima or minima at the switching points. As might be expected. at the large periods the advantage of cyclic operation disappears after about 100 cycles. The SOa oxidation model of Mihail and Paul also fails to predict Unni's results. We will demonstrate this in a subsequent letter. Figure 3, for a cyclic period of 40,000 set, shows the transient behavior of both cyclic and non-cyclic operations during the first five cycles. The surface concentration now follows closely the fluid concentration. In the first few cycles. the cyclic surface concentration is higher than the non-cyclic one. However. by the fifth cycle the time-average cyclic surface concentration is approximately the same as the non-cyclic concentration.