Pb0.04Co catalyst for N2O decomposition in presence of impurity gases

Abstract

Pb0.04Co(CP) catalyst prepared by coprecipitation method was investigated for N2O decomposition. It was found that the introduction of Pb into the catalyst greatly decreased the average size of Co3O4 crystallites, increased surface area, and active sites in population on the catalyst. The doping of Co3O4 with Pb also significantly weakened the CoO bond, which led to the activation energy decreasing from 74.0kJmol−1 to 28.9kJmol−1 and TOF of the reaction at 300°C increasing from 3.1×10−3s−1 to 23.1×10−3s−1. For the reaction over Pb0.04Co(CP) in the presence of 5vol% O2, 2vol% H2O, 500ppmv NO, 10vol% CO2, 50ppmv SO2, or some of them, the largest dynamic impact was caused from the NO together with the O2, which led to a decrease of N2O conversion from 100% to 40% at 350°C and 20000h−1. Whereas, CO2 had almost no influence on the reaction for the Pb0.04Co(CP) catalyst at the reaction conditions.