3RD INTERNATIONAL CONGRESS ON TECHNOLOGY - ENGINEERING & SCIENCE - Kuala Lumpur - Malaysia (2017-02-09)

The Reducible Nature Of The Support Over Cobalt-based Catalysts In Ht-wgs Reaction
We previously found that doping of cobalt into ceria was effective for improving the activity and stability of Co3O4 catalysts in the high temperature water gas shift reaction (HT-WGS) [1]. In this study, to investigate how the nature of the support can influence cobalt−based catalysts in the HT-WGS reaction, we have prepared a series of supported cobalt catalysts by varying the reducible and non-reducible support oxides. CeO2, ZrO2, and TiO2 oxides were selected as reducible supports and Al2O3 was selected as a non-reducible support. The characterization results show that the CeO2 supported Co catalyst (Co/CeO2) possesses the highest surface area and metal dispersion among the prepared catalysts. The catalytic performance results indicated that Co/CeO2 was the highly active in the temperature range of 350 ~ 550 oC. Moreover, the time-on-stream study revealed that the Co/CeO2 catalyst was relatively more stable than cobalt supported on ZrO2 and Al2O3 oxides. The outstanding activity and stability of the Co/CeO2 catalyst were attributed to its high metal dispersion, which is found strongly dependent on the reducible nature of the support.
Dae-Woon Jeong