"Do you have a ref. for this. What in deity's name is a 'reverse catalyst' ??"
What I meant was a catalyst that reverses the original solar heated process, giving up latent heat in the process.
The idea was to avoid higher temperatures and move more energy by increasing the flow rate of the chemicals, which sounded a pretty good idea to me.
IIRC candidate reactions were N2/H2/NH3 and SO2/O2/OO3
Relevant reports would be from the DTIC DoD search engine, although I'm not sure any of it is in PDF's. .