Effects of Cobalt and Chromium Loadings to The Catalytic Activities of Supported Metal Catalysts in Methane Oxidation

Abstract

A series of alumina supported cobalt and chromium catalysts with different metal loadings were prepared by impregnation method. Six types of alumina supported cobalt and chromium catalysts contained 5 wt%, 10 wt%, and 15 wt% loadings were produced and tested in methane oxidation. The catalysts were characterized by using x-ray diffraction (XRD) and carbon monoxide chemisorption (CO chemisorption). The XRD results do not confirmed any features of cobalt and chromium metal. The metal sizes for both catalysts were larger in high loading as shown by CO chemisorption results. Methane conversion results showed that the conversion increases with increasing the metal loading, however supported chromium catalysts were higher in activities compared to supported cobalt catalysts. Thermal stability tests on 15 wt% Co/Al and 15 wt% Cr/Al catalyst showed that supported chromium catalyst is more stable and maintain the particle size due to its strong interaction with support, while supported cobalt catalyst decrease in methane conversion due to deactivation of the catalyst. Copyright © 2020 BCREC Group. All rights reserved

Novel iron sand-derived α-Fe2O3/CaO2 bifunctional catalyst for waste cooking oil-based biodiesel production

“…Moreover, the fact that the addition of α-Fe 2 O 3 gave an amorphous structure to the catalyst also further hid the possible α-Fe 2 O 3 peaks present, since the weak peaks could be easily masked by the broad hump of the amorphous pattern. Mardwita et al ( 2020 ) had also obtained similar condition in their alumina-supported cobalt and chromium catalyst, and explained that these undetected peaks were due to the metal particles highly dispersed in the catalyst surface, consequently pushing alumina to be dominant and the only phase able to be detected by the XRD radiation.

Fig.

…”