[article] 
inIndustrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9753–9758

Titre :	Making sense of the fischer − tropsch synthesis reaction : Start - up
Type de document :	texte imprimé
Auteurs :	Xiaojun Lu, Auteur ; Diane Hildebrandt, Auteur ; Xinying Liu, Auteur
Année de publication :	2011
Article en page(s) :	pp. 9753–9758
Note générale :	Chimie industrielle
Langues :	Anglais (eng)
Mots-clés :	Fischer tropsch reaction
Résumé :	Conventional Fischer−Tropsch experiments were conducted to investigate the early stages (start-up) of the reaction of a TiO2-supported cobalt catalyst in a continuous stirred tank reactor and compared to the later stages. Thus, both short-term and long-term experiments were performed starting with fresh catalysts in each case. The experimental results showed that stirrer speed had an influence on the Fischer−Tropsch performance only in the short term. This suggested that under typical reaction conditions in a gas−solid system, long-term the Fischer−Tropsch reaction is not controlled by external mass transfer. After between about 30 and 80 h (depending on the temperature), large changes in reaction rate and product selectivity were observed, and these time-on-stream experiments showed that these changes were caused neither by the reaction conditions nor by the external mass transfer. Two possible explanations are proposed.
DEWEY :	660
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie1011933

[article] Making sense of the fischer − tropsch synthesis reaction : Start - up [texte imprimé] / Xiaojun Lu, Auteur ; Diane Hildebrandt, Auteur ; Xinying Liu, Auteur . - 2011 . - pp. 9753–9758.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 9753–9758

Mots-clés :	Fischer tropsch reaction
Résumé :	Conventional Fischer−Tropsch experiments were conducted to investigate the early stages (start-up) of the reaction of a TiO2-supported cobalt catalyst in a continuous stirred tank reactor and compared to the later stages. Thus, both short-term and long-term experiments were performed starting with fresh catalysts in each case. The experimental results showed that stirrer speed had an influence on the Fischer−Tropsch performance only in the short term. This suggested that under typical reaction conditions in a gas−solid system, long-term the Fischer−Tropsch reaction is not controlled by external mass transfer. After between about 30 and 80 h (depending on the temperature), large changes in reaction rate and product selectivity were observed, and these time-on-stream experiments showed that these changes were caused neither by the reaction conditions nor by the external mass transfer. Two possible explanations are proposed.
DEWEY :	660
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie1011933