THE ROLE OF SULFONATED ACTIVATED CARBONS AS CATALYSTS FOR THE HYDROLYSIS OF CELLOBIOSE

Bermejo, B.; Fraga, A. Couto; Sousa-Aguiar, E. F.

doi:10.1590/0104-6632.20190361s20170412

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Kinetic and Catalysis, Reaction Engineering and Materials Science • Braz. J. Chem. Eng. 36 (1) • Jan-Mar 2019 • https://doi.org/10.1590/0104-6632.20190361s20170412 copy

THE ROLE OF SULFONATED ACTIVATED CARBONS AS CATALYSTS FOR THE HYDROLYSIS OF CELLOBIOSE

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

In this work the production of glucose via hydrolysis of cellobiose using sulfonated active carbons as catalysts was studied. Commercial carbons presenting different types of porous system (micropores and mesopores) have been treated with sulfuric acid at different temperatures, being characterized afterwards. Such carbons have been tested as catalysts in the reaction of cellobiose hydrolysis. The results indicated that the type and density of sulfonic sites are not the only parameters responsible for the activity of the catalysts. Indeed, the porosity of the catalysts also plays an important role in the determination of the catalyst activity.

Key words:
Hydrolysis; Sulfonated carbon; Cellobiose; Glucose

Sample	BET Surface (m²/g)	t-plot micropore area (cm²/g)	Total pore volume (cm³/g)
C-147	670	365	0.56
C-141-S	780	684	0.30

Sample	Temperature of sulfonation (ºC)	Specific surface (m²/g)	Micropore area (m²/g)	Average pore size (Å)
C-141-S	120	846	724	19.9
C-141-S	160	628	526	20.2
C-141-S	200	562	465	20.4
C-147	120	363	157	35.6
C-147	160	551	293	32.6
C-147	200	559	297	32.3

Sample	Sulfonation temperature (ºC)	Ash content (wt%)
C-141-S untreated	-	2.11
C-141-S	120	1.82
C-141-S	160	0.69
C-141-S	200	1.52
C-147 untreated	-	3.23
C-147	120	2.68
C-147	160	2.42
C-147	200	2.02

Sample	Sulfonation temperature (ºC)	Sulfonic groups (mmol/g)	Surface pH	Non-sulfonic acid sites (mmol/g)
C-141-S untreated	-	-	10.62	0.49
C-141-S	120	0.33	2.50	0.51
C-141-S	160	0.29	2.37	0.56
C-141-S	200	0.24	3.18	0.88
C-147 untreated	-	-	5.67	0.60
C-147	120	0.81	2.06	0.27
C-147	160	0.53	2.05	0.50
C-147	200	0.31	2.29	1.00

Sample	Sulfonation temperature (ºC)	Conversion* (%)
C-141-S	120	58.6
C-141-S	160	37.8
C-141-S	200	22.0
C-147	120	55.6
C-147	160	51.5
C-147	200	41.3

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[1] Corresponding author: E. F. Sousa-Aguiar - E-mail: efalabella@eq.ufrj.br