Yes, although it requires a high pressure of hydrogen gas.

The higher the pressure of H2, the faster the reaction will occur. Essentially you’re adding more “equivalents” of H2 and forcing the adsorption of H2 on to the active sites of the metal, speeding up the reaction (which occurs on the metal surface)

When I used it personally it did not appear to be reusable in any way. I ended up with green wastewater after destruction of excess reagent with acid. Nickel is not nearly as bad as chromium, but proper waste procedures should be followed.

Darn it. Thank you.

Yes, at high enough pressure.

With enough pressure, Raney Nickel can reduce carbonyls. You’re probably looking at at least 1000 psi, though.

If it’s just NO2 to amine without touching the alkene, just use Sn and HCl.