[article] 
inIndustrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 123–131

Titre :	Olefin production by catalytic transformation of crude bio-oil in a two-step process
Type de document :	texte imprimé
Auteurs :	Ana G. Gayubo, Auteur ; Beatriz Valle, Auteur ; Andrés T. Aguayo, Auteur
Année de publication :	2010
Article en page(s) :	pp. 123–131
Note générale :	Industrail chemistry
Langues :	Anglais (eng)
Mots-clés :	Olefin--Production--Catalytic--Transformation--Crude--Bio-Oil----Two-Step Process
Résumé :	The valorization of crude bio-oil by catalytic transformation into hydrocarbons has been carried out in an online two-step (thermal-catalytic) process. The deposition of pyrolytic lignin, formed by polymerization of biomass-derived products, is enhanced in the thermal step. Volatiles are processed in a fluidized bed reactor with a catalyst that is hydrothermally stable and selective for olefin production, which has been based on a HZSM-5 zeolite. A study has been made of the effect of operating conditions (methanol content in the feed of bio-oil/methanol, temperature, space time, and time on stream) on bio-oil conversion, product lump yields and the selectivity of each individual C2−C4 olefin. These conditions also have a significant effect on deactivation, which is attributed to coke deposited on the catalyst. The TPO curves of coke combustion identify two fractions: one of thermal origin (pyrolytic lignin) and the other of catalytic origin, whose formation depends on the concentration of oxygenates in the reaction medium. A feed with 50 wt % of methanol, at 500 °C, with space time of 0.371 (g of catalyst) h (g of methanol)−1 allows a 94 wt % conversion of the bio-oil in the feed, with a selectivity of C2−C4 olefins of 48 wt % (50 wt % is propene) and low yields of CO and CO2 (its formation is attenuated by cofeeding methanol).
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie901204n

[article] Olefin production by catalytic transformation of crude bio-oil in a two-step process [texte imprimé] / Ana G. Gayubo, Auteur ; Beatriz Valle, Auteur ; Andrés T. Aguayo, Auteur . - 2010 . - pp. 123–131.
Industrail chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 123–131

Mots-clés :	Olefin--Production--Catalytic--Transformation--Crude--Bio-Oil----Two-Step Process
Résumé :	The valorization of crude bio-oil by catalytic transformation into hydrocarbons has been carried out in an online two-step (thermal-catalytic) process. The deposition of pyrolytic lignin, formed by polymerization of biomass-derived products, is enhanced in the thermal step. Volatiles are processed in a fluidized bed reactor with a catalyst that is hydrothermally stable and selective for olefin production, which has been based on a HZSM-5 zeolite. A study has been made of the effect of operating conditions (methanol content in the feed of bio-oil/methanol, temperature, space time, and time on stream) on bio-oil conversion, product lump yields and the selectivity of each individual C2−C4 olefin. These conditions also have a significant effect on deactivation, which is attributed to coke deposited on the catalyst. The TPO curves of coke combustion identify two fractions: one of thermal origin (pyrolytic lignin) and the other of catalytic origin, whose formation depends on the concentration of oxygenates in the reaction medium. A feed with 50 wt % of methanol, at 500 °C, with space time of 0.371 (g of catalyst) h (g of methanol)−1 allows a 94 wt % conversion of the bio-oil in the feed, with a selectivity of C2−C4 olefins of 48 wt % (50 wt % is propene) and low yields of CO and CO2 (its formation is attenuated by cofeeding methanol).
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie901204n