Not being familiar with the intracacies of catalytic reactions, I ask the following. I know in spectography, everything has a unique wavelength. If this is true, then bio gas could be routed thru various catalytic 'filters' that would cause different metals in the wood to be separated before oxidation. That would allow infinite spacing and therefore reaction in the full spectrum. Perhaps I am off on this, but I do know from experience that there is a tremendous amount of energy released in a catalyst from wood smoke.
Much more radiation occurs than if it was just burned in open flame.
Bottom line is that emmissions can be eliminated and become a delta positive instead of a drain on the overall system.