Upgrading the rice husk char obtained by flash pyrolysis for the production of amorphous silica and high quality activated carbon.

Abstract:

:The overall valorization of rice husk char obtained by flash pyrolysis in a conical spouted bed reactor (CSBR) has been studied in a two-step process. Thus, silica has been recovered in a first step and the remaining carbon material has been subjected to steam activation. The char samples used in this study have been obtained by continuous flash pyrolysis in a conical spouted bed reactor at 500°C. Extraction with Na2CO3 allows recovering 88% of the silica contained in the rice husk char. Activation of the silica-free rice husk char has been carried out in a fixed bed reactor at 800°C using steam as activating agent. The porous structure of the activated carbons produced includes a combination of micropores and mesopores, with a BET surface area of up to 1365m(2)g(-1) at the end of 15min.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Alvarez J,Lopez G,Amutio M,Bilbao J,Olazar M

doi

10.1016/j.biortech.2014.07.073

subject

Has Abstract

pub_date

2014-10-01 00:00:00

pages

132-137

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(14)01062-1

journal_volume

170

pub_type

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