High Catalytic Activity and N-2 Selectivity on Catalytic Denitrification by Fe-0 and Bimetallic Catalyst

摘要

This research focused on the improvement of catalytic activity and N-2 selectivity in catalytic denitrification by zero-valent iron (Fe-0) and bimetallic catalyst. Analysis of optimal operating conditions indicated that Pd-Cu/graphene showed better catalytic performance (catalytic activity: 0.44 mg/L.g.min, N-2 selectivity: 70%) than other catalysts under the same following conditions: 4 g/L Fe-0, 3 g/L catalyst, 3:1 Pd:Cu (Pd: 5% by weight), 2-h reaction time, and 5.1 pH. This may be due to graphene's larger specific surface area, good chemical stability, thermostability, and strong electron transfer illustrated via characterization of S-BET, SEM, FTIR, and TG. Finally, experiments on regeneration and reuse of catalysts indicated that acidic washing helped to regenerate the catalysts. However, except for Pd-Cu/diatomite, the catalytic performances of other catalysts appeared to be lower than their original catalysts. (c) 2020 American Society of Civil Engineers.