Nitrous synthesis mechanism

[pashov]

Rhodium.ws lists Patent US4,376,105 as a synthesis for laughing gas. The synthesis works fine and it's easy. I would like to know about the mechanism of the reaction. I understand nobody who hasn't done some research about the particular reaction can know the exact mechanism .. But I really have no idea of what's going on there ...
So, what do you think is happening there? Can any general assumptions or "educated guesses" be made?