Print: | ISSN 0256-1115 |
Online: | ISSN 1975-7220 |
Korean Journal of Chemical Engineering,
Vol.17, No.1, 71-75, 2000 A Statistical Evaluation of Preparation conditions on the Performance of Ce-Promoted Co-Mo Fischer-Tropsch Catalyst
This paper describes a statistical approach to the optimal selection of preparation conditions for a ceria-promoted Co-Mo catalyst used during CO hydrogenation. Eight catalyst samples based on a full factorial design were prepared via incipient wetness method. Evaluation was carried out in laboratory packed bed reactor using synthesis gas containing H2:CO=2 at 280℃ and 110 kPa. BET was unaffected by pH although increased calcination temperature induced only a small drop in total surface area. More significantly, catalysis calcined at low temperature (350℃) suffered a 3-fold loss in metal surface area when treated at high temperatures (550℃) while an increase in pH improved the metal area value. pH values above the isoelectric point (IEP=5.65) and low calcination temperature favoured activity and alkene selectivity. High reduction temperature, however, appeared to enhance methane suppression. Additionally, 2-factor interactions were statistically more significant than 3-factor interactions at 95% confidence level. Optimisation of the polynomial models describing the response data was also consistent with qualitative inferences.
Keywords:
Fishcer-Tropsch Synthesis; Statistical Evaluation; Co-Mo Catalyst; Optimal Catalyst Design
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