Principle of extracting energy from chemical reaction

Suppose there is an endothermic chemical reaction like: A+B+ Heat energy K1→C+D

Now with Catalyst X, A+B+ (Catalyst X)+ Heat energy K2→C+D

Consider the reverse reaction, C+D(Catalyst Y)→A+B+Heat Energy K1

If we found Catalyst X and Y then we have can earn energy of amount of K2-K1; we thus have a means for producing free energy.