Details

Title:

Preparation of Adsorbents Derived from Pyrolytic Rice Husk Char

Author(s):

Alvarez, J., Lopez, G., Amutio, M., Erkiaga, A., Barbarias, I., Olazar, M.

Document(s):

Abstract:

Activation of pyrolytic rice husk char has been carried out using carbon dioxide as activation agent. The effect of activation time has been studied in a fixed bed reactor at 800 ºC. The char samples used in the activation process have been obtained by continuous flash pyrolysis carried out in a conical spouted bed reactor at 500 ºC. This char is mainly composed of carbon and ash present in the raw material (98 wt. % of silica), therefore, a previous extraction of silica has been developed in order to obtain a value added product and to improve the active carbon properties. The pyrolytic char is firstly treated with HCl (1M) to remove the mineral fraction, and then is boiled with a solution of sodium carbonate (15 wt. %) to leach out the silica. The carbonaceous matter is used to prepare active carbon and the filtrate is employed to synthesize silica. The activated carbons are found to be a mixture of micropores and mesopores, where the maximum BET area is obtained at 45 min with a value of 1516 m2 g­1 .

Keywords:

activated carbon, rice husks, char, adsorbent

Topic:

R&D on Biomass Conversion Technologies for Heating, Electricity and Chemicals

Subtopic:

Pyrolysis and other biomass liquefaction technologies

Event:

21st European Biomass Conference and Exhibition

Session:

2CV.4.21

Pages:

947 - 952

ISBN:

978-88-89407-53-0

Paper DOI:

10.5071/21stEUBCE2013-2CV.4.21

Price:

FREE