For an oscillation amplitude of ΔU B ~ 0.5 eV in Figure , there exists a small region (yellow) where the forward A → B reaction is promoted between relative binding energies of B of 0-0.2 eV and about 10 2 Hz. However, above about 0.15 eV of relative binding energy of B exists a large region (dark blue) overwhelmingly favorable to the reverse reaction (formation of A). Higher oscillation amplitudes in low gamma γ B-A catalytic systems again lead to high conversion at oscillatory steady state, in this case for both reaction directions as yields > 90 % B are observed while other oscillation endpoints yield > 99 % A. The two regions are split by the delta point (δ ~ 1.4 eV, 0.4 relative binding energy of B). The implication is that this system can be tuned to produce an outlet stream with nearly completely controllable composition at high reactor residence times, just by varying the oscillation endpoints at frequencies between 1-10 Hz. The high and low conversion regimes exist as low as 0.001 Hz making them accessible to slowly oscillating systems. This behavior is nearly identical to the high gamma system in Figure ; as the only difference between Figure and 13 being the inverse values of gamma (γ B-A of 2.0 and 0.5, respectively), this inverse mirrored behavior is expected. Both low and high gamma systems provide versatility in conversion as nearly pure product streams of A or B can be produced by merely changing the dynamic catalysis oscillation endpoints relative to the catalytic chemistry delta point. The relationship between selected parameters and catalytic pumping directionality is depicted in Figure for the system previously described in Figure The directionality of the dynamic catalytic system is visually apparent from the values of the enthalpy of A* and B* at the minimum amplitude (U min ). The reverse reaction (B-to-A) is favored when A* is lower in energy than B* at U min in Figure , while the forward reaction (A-to-B) is favored when B* is lower in energy than A* at U min in Figure . By this interpretation, the lower energy state U min serves as the condition whereby the surface reaction proceeds to accumulate A* or B* on the surface; the higher energy state U max then serves to push this surface reaction product into the gas phase. In the low energy state U min , the transition state enthalpy must be lower than the desorption enthalpy to permit the surface reaction to proceed. This general behavior is depicted in the schemes for the reverse reaction (Figure ) and forward reaction (Figure ).