What is the principle of palladium carbon + formation of ammonium formate?

No, ammonium formate has aldehyde group

This is the same as palladium, the hydrogen reaction mechanism; except that the methane can provide hydrogen, as a source of hydrogen, is equivalent to replacing hydrogen.

It should be reduced by the reductability of the aldehyde group in the metallic acid.

Ammonium formate is oxidized into ammonium carbonate.Here, the palladium carbon is placed to capture hydrogen, and it is not added to

Trouble, have there related articles?Or can you tell this reaction to restore C \u003d C?