Journals / Turkish Journal of Chemistry / 2007 / Cilt: 31 - Sayı: 5
Deactivation of a Co-Precipitated Co/Al2O3 Catalyst
- Journal
- Turkish Journal of Chemistry
- Pages
- 515–521
- DOI
- —
Abstract
The effects of reaction temperature, feed ratio, space time, and CO percentage in feed on the deactivation conditions of a co-precipitated 36 wt% Co/Al2O3 catalyst in CO hydrogenation were investigated. Environmental-SEM-EDX and temperature-programmed reduction (TPR) studies were performed on used catalysts to investigate the effect of reaction conditions on catalyst deactivation. Intensive coke deposition on the catalyst was observed at a reaction temperature of about 573 K. Increasing the H2/CO ratio also increased the catalyst activity. Methane formed as the main product at high H2/CO ratios. Although catalyst activity did not change significantly during the 9-h reaction period at all conditions, a maximum of 6.8% C deposition was observed with increasing H2/CO, and this caused a 2% decrease in the total surface area of the used catalyst. Space time and CO percentage in the feed had less influence on catalyst decomposition.
Özet
The effects of reaction temperature, feed ratio, space time, and CO percentage in feed on the deactivation conditions of a co-precipitated 36 wt% Co/Al2O3 catalyst in CO hydrogenation were investigated. Environmental-SEM-EDX and temperature-programmed reduction (TPR) studies were performed on used catalysts to investigate the effect of reaction conditions on catalyst deactivation. Intensive coke deposition on the catalyst was observed at a reaction temperature of about 573 K. Increasing the H2/CO ratio also increased the catalyst activity. Methane formed as the main product at high H2/CO ratios. Although catalyst activity did not change significantly during the 9-h reaction period at all conditions, a maximum of 6.8% C deposition was observed with increasing H2/CO, and this caused a 2% decrease in the total surface area of the used catalyst. Space time and CO percentage in the feed had less influence on catalyst decomposition.