= Catalyst deactivation
<Catalyst deactivation> is loss of catalytic activity during use. Regeneration in an ideal <catalytic cycle> does not rule out a separate damaging <chemical reaction>, blocking of a surface, or physical loss of <catalyst> from the apparatus. A route can also be slowed by <diffusion> to the surface or by accumulation of a <reaction intermediate>. Such effects limit the usefulness of a low schematic <reaction energy barrier>: measured throughput depends on the whole <reaction mechanism> and on transport. Demonstrating regeneration requires more evidence than observing a faster first run. For a recovered solid <catalyst>, a useful further comparison is a second run with fresh <reactants>, matched recovered amount, and the same mixing and <temperature>, alongside a fresh-solid run and a blank. Loss during recovery or residual <reactants> can otherwise imitate <catalyst deactivation> or apparent reuse. This is a proposed control, not an observation reported for the <catalysed peroxide comparison>.
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