Continuous stirred tank reactor Contribution

In this contribution, we present computer analyses of several selected temperature-programmed desorption (TPD) and temperature-programmed surface reaction (TPSR) experiments in a microreactor flow system operating under atmospheric pressure. The continuous stirred tank reactor (CSTR) and plug flow reactor (PFR) models have been applied for the design equation as... 

The key species in the FKN mechanism is BrO, which functions as both oxidant for Ce(III) and reductant for Ce(IV). This species is formed in the reaction between BrOj (bromate) and HBrOj (bromous acid). Neither BrOj nor HBrOz are stable in aqueous media and thus are produced and consumed in the FKN mechanism as intermediate species. A lucid description of the specifics of the oscillating reaction system has been provided by Barkin et al. (1977). A more recent contribution from Bar-Eli (1985) indicates that in a continuously stirred tank reactor (CSTR) only four or five of the total 14 reaction rate constants are required to describe the oscillations. Yoshida and Ushiki (1982) studied the oxidation of Ce(III) by Br03 found an induction period precedes a burst of Ce(IV) production, followed by continued slow generation of Ce(IV). The length of the induction period was highly dependent on the age of the reactant solution. 

Solution. Only in an ideal continuous stirred tank reactor are [M] and [J], and therefore x , constant, giving the narrowest possible distribution, due only to the microscopically random nature of the reaction. With an ideal CSTR, / = Xy,lx . In a batch reactor, [M] and [Ij vary with time, and in tubular reactors, with position, causing a shift in x with conversion, broadening the distribution so that / > x x . Note that changes in temperature, which cause the rate constants to vary, will also contribute to broadening of the distribution. 

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