[article] 
inIndustrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4359–4365

Titre :	A new way to look at fischer−tropsch synthesis using flushing axperiments
Type de document :	texte imprimé
Auteurs :	Xiaojun Lu, Auteur ; Xiaowei Zhu, Auteur ; Diane Hildebrandt, Auteur
Année de publication :	2011
Article en page(s) :	pp. 4359–4365
Note générale :	Chimie industrielle
Langues :	Anglais (eng)
Mots-clés :	Fischer tropsch synthesis
Résumé :	When Fischer−Tropsch synthesis (FTS) reaction experiments were conducted in a gas−solid system with a TiO2-supported cobalt catalyst in a continuous stirred tank reactor (CSTR), we observed significant changes in the reaction rate and product selectivity at an early stage of time on stream (TOS) when all the reaction conditions were kept constant.(1) We designed flushing experiments with an inert gas that started when the FTS reaction had reached steady state. After the completion of flushing, the FTS reaction was resumed with syngas. We then compared the results of the FTS reaction rate and product selectivity both before and after flushing. The flushing experimental results suggested that the marked variations we observed were caused (either wholly or mainly) by liquid products deposited in the catalyst rather than by the change in the properties of the catalyst surface. The concentrations and the relative amount of the reactant in the flushed out stream were examined and the implications of the high H2/CO ratio for the reaction kinetics and product selectivity are discussed. On the basis of the dynamic concentrations of C1−C8 in the flushed outgas, we propose that reaction among the products takes place under moderate FTS reaction conditions.
DEWEY :	660
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie102095c

[article] A new way to look at fischer−tropsch synthesis using flushing axperiments [texte imprimé] / Xiaojun Lu, Auteur ; Xiaowei Zhu, Auteur ; Diane Hildebrandt, Auteur . - 2011 . - pp. 4359–4365.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4359–4365

Mots-clés :	Fischer tropsch synthesis
Résumé :	When Fischer−Tropsch synthesis (FTS) reaction experiments were conducted in a gas−solid system with a TiO2-supported cobalt catalyst in a continuous stirred tank reactor (CSTR), we observed significant changes in the reaction rate and product selectivity at an early stage of time on stream (TOS) when all the reaction conditions were kept constant.(1) We designed flushing experiments with an inert gas that started when the FTS reaction had reached steady state. After the completion of flushing, the FTS reaction was resumed with syngas. We then compared the results of the FTS reaction rate and product selectivity both before and after flushing. The flushing experimental results suggested that the marked variations we observed were caused (either wholly or mainly) by liquid products deposited in the catalyst rather than by the change in the properties of the catalyst surface. The concentrations and the relative amount of the reactant in the flushed out stream were examined and the implications of the high H2/CO ratio for the reaction kinetics and product selectivity are discussed. On the basis of the dynamic concentrations of C1−C8 in the flushed outgas, we propose that reaction among the products takes place under moderate FTS reaction conditions.
DEWEY :	660
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie102095c