Selective reduction of NO_x by hydrogen and methane in natural gas stationary sources over alumina supported Pd, Co and Co/Pd catalysts Part B: On the effect of bimetallic catalyst preparation

摘要

The aim of the present work is to study the selective reduction of NO_x. from natural gas sources using unburned methane or hydrogen as reducing agents. The results suggest that the NO_x are reduced by H2 at low temperature, when methane is not activated and at higher temperature the methane is then the main reducing agent. Similar results are obtained for alumina supported palladium and alumina supported cobald-palladium catalysts at low temperature in presence of hydrogen suggesting that the active phase for the reaction NO/H2 is the palladium. However, at high temperature the higher activity is obtained on bimetallic catalyst. The presence of cobalt enhances the catalytic activity. This result suggests that cobalt and palladium both in cationic form are the active sites when the reducing agent is the methane.