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Effect of lanthanum doping on the lifetime of Co/γ-Al 2O 3 catalysts in Fischer-Tropsch synthesis
Hemmati, M. R ; Sharif University of Technology | 2012
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- Type of Document: Article
- DOI: 10.1016/j.jtice.2012.03.002
- Publisher: Elsevier , 2012
- Abstract:
- Cobalt-based catalysts were prepared on gamma alumina supports, and their behaviour for different Fischer-Tropsch synthesis (FTS) conditions was assessed. Although Co/γ-Al 2O 3 is a well-known FTS catalyst, its durability ought to be improved to make the industrial process economically feasible. The effect of lanthanum doping on the catalyst lifetime was examined utilising reactor tests and catalyst characterization techniques including TPR, ICP and N 2 porosimetry. Reactor test results revealed that an optimum amount of lanthanum improved catalyst activity and selectivity. Increasing amounts of lanthanum doping up to about 1.1wt% seemed to modify the chemical composition of the support resulting in improved catalyst selectivity and lifetime. Further increase in lanthanum doping up to 2.7wt% only marginally enhanced the catalyst selectivity and lifetime. TPR results revealed that the high temperature peak due to cobalt aluminate phase shifted to lower temperatures with increasing amount of doped lanthanum possibly due to the formation of lanthanum/aluminium mixed oxides
- Keywords:
- Catalyst characterization ; Catalyst lifetime ; Chemical compositions ; Cobalt aluminate ; Cobalt Catalyst ; Cobalt-based catalysts ; Deactivation ; Gamma alumina ; High temperature peaks ; Industrial processs ; Lanthanum doping ; Mixed oxide ; Phase shifted ; Porosimetry ; Alumina ; Catalyst selectivity ; Cobalt ; Lanthanum ; Lanthanum alloys ; Fischer-Tropsch synthesis
- Source: Journal of the Taiwan Institute of Chemical Engineers ; Volume 43, Issue 5 , September , 2012 , Pages 704-710 ; 18761070 (ISSN)
- URL: http://www.sciencedirect.com/science/article/pii/S1876107012000430