TAP analysis of single and double peak responses during CO oxidation over Pt

Critical phenomena in heterogeneous catalysis have attracted a considerable interest throughout history due to their intriguing dynamical complexity. The coordinated interplay of various phenomena, such as surface interactions, nonlinear reaction mechanisms and the transport of energy and mass, determine the likelihood of dynamic patterns in certain catalytic systems. In this work, pulse experiments performed with a Temporary Analysis of Products (TAP) reactor showcase the complex dynamic behavior of CO oxidation over a Pt catalyst and exhibit its dependence on the pulsed CO/O2 ratio and the local bed temperature. Pulse responses exhibit a dynamic transition between two critical values of the reaction rate for feed mixtures richer in O2 due to the controlled interactions of the adsorbed species on the surface of the catalyst.

Automated summary

The study reveals the complex dynamic behavior of CO oxidation over a Pt catalyst in heterogeneous catalysis. It shows that critical phenomena in such systems are influenced by surface interactions, nonlinear reaction mechanisms, and the transport of energy and mass. The pulse experiments conducted with a TAP reactor demonstrate the dependence of the dynamic patterns on the pulsed CO/O2 ratio and the local bed temperature, resulting in a dynamic transition between two critical values of the reaction rate for feed mixtures richer in O2 due to controlled interactions of adsorbed species on the catalyst's surface.