Kinetics of catalytic oxidation of sulphur dioxide for comparison of fixed and fluid bed reactors
1957; Wiley; Volume: 7; Issue: 5 Linguagem: Inglês
10.1002/jctb.5010070510
ISSN1934-998X
AutoresMax Goldman, Lawrence N. Canjar, Robert B. Beckmann,
Tópico(s)Metal Extraction and Bioleaching
ResumoAbstract The kinetics of the oxidation of sulphur dioxide over a commercial vanadia catalyst in confined and fluidized beds have been investigated under various operating conditions. The reaction rates for both the confined and the fluidized operation were correlated by an equation based on the assumption that the reaction rate was controlled by the specific surface reaction between activatedly adsorbed atomic oxygen and activatedly adsorbed sulphur dioxide at high mass velocities where diffusional effects are negligible. The general rate equation is: \documentclass{article}\pagestyle{empty}\begin{document}$ \[r = \frac{{kE\sqrt {K_{O_2 } .K_{3O_2 } } \left[{p_{SO_2 } \sqrt {p_{O_2 } } - {{p_{SO_3 } } \mathord{\left/ {\vphantom {{p_{SO_3 } } K}} \right. \kern-\nulldelimiterspace} K}} \right]}}{{1 + \left[{\sqrt {p_{O_2 } \cdot K_{O_2 } } + p_{SO_2 } \cdot K_{SO_2 } + p_{SO_3 } \cdot K_{SO_3 } } \right]^2 }} \] $\end{document} The individual reaction rate data were correlated by assuming the adsorption equilibrium and reaction velocity constants were the same for both the confined and the fluidized operations. The developed rate equations differ only in the effectiveness factors for the specific mode of gas‐solid contacting. This study gives some insight into the practical problem of applying fixed bed catalytic data to fluidized operation in the absence of fluidized bed data or vice versa. It also demonstrates the possibility of correlating fixed and fluidized bed data with a single parameter. It is doubtful if, as is generally supposed, a fluidized bed under low mass velocity conditions behaves as a fixed bed.
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