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http://dx.doi.org/10.9713/kcer.2012.50.2.229

Phosphorus Modified Co/Al2O3 Fischer-Tropsch Catalyst for a Slurry Phase CSTR with Enhanced Hydrothermal and Mechanical Stability  

Jung, Gyu-In (Research Center for Green Catalysis, Korea Research Institute of Chemical Technology)
Ha, Kyoung-Su (Research Center for Green Catalysis, Korea Research Institute of Chemical Technology)
Park, Seon-Ju (Research Center for Green Catalysis, Korea Research Institute of Chemical Technology)
Kim, Du-Eil (Research Center for Green Catalysis, Korea Research Institute of Chemical Technology)
Woo, Min-Hee (Research Center for Green Catalysis, Korea Research Institute of Chemical Technology)
Jun, Ki-Won (Research Center for Green Catalysis, Korea Research Institute of Chemical Technology)
Bae, Jong-Wook (Department of Chemical Engineering, Sungkyunkwan University)
Kang, Yong (School of Chemical Engineering, Chungnam National University)
Publication Information
Korean Chemical Engineering Research / v.50, no.2, 2012 , pp. 229-237 More about this Journal
Abstract
Phosphorus was incorporated into Co/$Al_2O_3$ catalyst for FTS by impregnating an acidic precursor, phosphoric acid, in ${\gamma}-Al_2O_3$ support to improve the mechanical strength, the hydrothermal stability of the catalyst particle, and the catalytic performance as well. Surface characterization techniques such as FT-IR revealed that $AlPO_4$ phase was generated on the surface of the P-modified catalyst. The addition of phosphorus was found to alleviate the interaction between cobalt and alumina surface, and to increase reducibility of catalyst. The catalytic activity such as $C_{5+}$ productivity and turnover frequency (TOF) was calculated to evaluate catalytic performance. The influence of calcination temperature of the $Al_2O_3$ containing 2 wt.% P on the catalytic performance was also investigated. Through hydrothermal stability test and XRD analysis, the P-modified catalyst had strong resistant to the pressurized and hot $H_2O$. The mechanical strength of the P-modified catalyst was also examined through an in-house fluidized-bed vessel, and it was found that the catalyst fragmentation could be successfully suppressed with P. Taken as a whole, the best performance was shown to be at 1~2 wt.% P in alumina and at the calcination temperature of $500^{\circ}C$.
Keywords
Fischer-Tropsch; CSTR; Hydrothermal Stability; Attrition Test;
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