Which reagents can directly oxidize ammonium ion into gaseous dinitrogen?

I have a simple question. I've looked on the internet and the only thing I found was the [Anammox](https://en.wikipedia.org/wiki/Anammox) process - *An*aerobic *Amm*onium *Ox*idation. Wikipedia lists the reaction as:


$$\ce{NH4+} +\ce{NO2-}\rightarrow\ce{N2}+\ce{2H2O}$$


But only a few bactetria perform this process. I am looking for actual laboratory reagents that can oxidize ammonium ion to dinitrogen gas. My professor said that neither $\ce{KMnO4}$ nor $\ce{K2Cr2O7}$ can do the oxidation, and that one would have to use bleaching powder or $\ce{XeF2}$ instead. However I could NOT confirm his claim on the internet. Thus, I wish to know a list of such reagents which can do what I wish to. Thank you!


