CAIE A-Level Chemistry A2 26.2.2 Heterogeneous Catalyst Action Topic Practice

Hypophosphorous acid is an inorganic acid.
The conjugate base of hypophosphorous acid is $\mathrm{H}_{2} \mathrm{PO}_{2}^{-}$.

A student suggests that the reaction between $\mathrm{H}_{2} \mathrm{PO}_{2}^{-}(\mathrm{aq})$ and $\mathrm{OH}^{-}(\mathrm{aq})$ might happen more quickly in the presence of a heterogeneous catalyst.

Describe the mode of action of a heterogeneous catalyst.