Potassium chloride (KCl) is a very stable compound. It does not readily undergo thermal decomposition, even at high temperatures. This means that the absence of a catalyst has no effect on the outcome of the thermal decomposition of potassium chloride.

Here's why:

* Strong ionic bond: KCl is an ionic compound held together by strong electrostatic attractions between potassium cations (K+) and chloride anions (Cl-). These bonds require a significant amount of energy to break.

* High decomposition temperature: The decomposition of KCl requires extremely high temperatures, well beyond what is typically encountered in a laboratory setting.

* No inherent tendency to decompose: KCl is a stable compound and does not readily break down into its constituent elements under normal conditions.

In summary, thermal decomposition of potassium chloride is not a feasible process under normal circumstances, regardless of the presence or absence of a catalyst.