There is no sciences in that. Thrust is a function of the speed at which gases are ejected. Without velocity the thrust would be null, turning the gas generator (the turbine) into an inefficient ICE... (only the fan will produce thrust from the ill-generated electricity) .
Also, the volume of ejected gas during a typical airliner flights would lead to a gigantic "particule filter", heavy, that would have to be replaced certainly as much as a battery... And obviously disposed on an ecological manner. Not really practical in any meanings (the filter does not produce energy and would draw a large amount of power to be disposed).
There are plenty of other manner to dispose off Nox and CoX, one in particular is by not-producing them as much... Something that turbines are really efficiently doing already!