The above microkinetic models predict absolute, per active site rates at given conditions. Experiments most directly provide access to product yields rather than reaction rates. To compare plasma-only to plasma-catalytic yields, we develop well-mixed, isothermal integral reactor models appropriate to the plasma afterglow region and the Pt catalyst bed, respectively (Fig. and and see details in Supplementary Methods). Bulk temperatures are assumed to be 873 K to correspond with experiments.