StartStoppReaktionen

StartStoppReaktionen, often translated as start-stop reactions, refers to a specific type of chemical process characterized by distinct phases of rapid activity followed by periods of inactivity. These reactions do not proceed at a constant rate but rather exhibit an intermittent behavior. This phenomenon is observed in various chemical systems, including some catalytic processes and electrochemical reactions. The underlying mechanisms typically involve the formation and destruction of intermediate species or surface structures that govern the reaction rate.

One common scenario where start-stop reactions occur is in heterogeneous catalysis. Here, the catalyst surface might become temporarily poisoned or passivated, halting the reaction. Subsequently, conditions might change, leading to the removal of the inhibitor or regeneration of the active sites, allowing the reaction to restart. Similarly, in electrochemical systems, the accumulation or depletion of reactants at an electrode surface, or the formation of passivation layers, can lead to stop phases.

Understanding start-stop reactions is crucial for controlling and optimizing chemical processes. The intermittent nature can affect product yield, reaction selectivity, and energy consumption. Researchers investigate the kinetics and mechanisms of these reactions to identify the factors that trigger the transitions between active and inactive states. This knowledge allows for the design of catalysts or operating conditions that can either mitigate or deliberately utilize this characteristic behavior for specific applications.