Abd El-Aziz Ahmed Said
Assiut University, Egypt
Title: Influence of sonication on the catalytic activity of CuxCo3−xO4 nanocatalysts for conversion of CO into CO2 efficiently
Biography
Biography: Abd El-Aziz Ahmed Said
Abstract
In this work, the incorporation of CuO into Co3O4 (CuxCo3−xO4, 3.0≤x≥0.0) is presented as promoter to obtain highly active and stable nanocatalysts towards the catalytic conversion of CO into CO2. The pure and mixed oxides were prepared by co-precipitation-sonication method using K2CO3 as precipitant. The catalysts were characterized by TG-DTA, XRD, BET, HRTEM, electrical conductivity and surface chemisorbed oxygen measurements. The results revealed that the addition of CuO (x=0.0-0.75) to Co3O4 monotonically increases the specific surface area, the amount of surface chemisorbed oxygen, electrical conductivity and catalytic activity of the nanocatalysts. The role of the active redox sites existed in these nanocatalysts such as Co3+/Co2+, Cu2+/Cu+ and Co3+/Cu+ which are responsible for such modification was discussed. In addition, the catalytic activity indicated that Cu0.75Co2.25O4 nanocatalyst calcined at 400℃ exhibited the highest catalytic activity with total conversion of CO into CO2 at 125℃. Furthermore, the CuxCo3−xO4 catalysts also display high catalytic long-term stability. Finally the effects of various operational parameters were also studied.