What is the reaction mechanism of a selective catalytic reaction with urea? What is the reaction mechanism of the following reaction:

$$\ce{4NO + 2(NH2)2CO + O2 -&gt; 4N2 + 4H2O + 2CO2}$$

I expect that the catalyst is vanadium oxide and titanium oxide.
Where can I find a detailed description of the reaction mechanism?
After researching this topic, I've found the mechanism to be: