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

被引：121

作者：

Alvarez, Jon ^{[1
]}

Lopez, Gartzen ^{[1
]}

Amutio, Maider ^{[1
]}

Bilbao, Javier ^{[1
]}

Olazar, Martin ^{[1
]}

机构：

[1] Univ Basque Country UPV EHU, Dept Chem Engn, E-48080 Bilbao, Spain

来源：

BIORESOURCE TECHNOLOGY | 2014年 / 170卷

关键词：

Activated carbon; Char; Rice husks; Steam activation; Adsorbent; AGRICULTURAL RESIDUES; RAPID PYROLYSIS; ASH; BIOMASS; ADSORPTION; PRECURSORS; EVOLUTION; STRENGTH; CATALYST; POROSITY;

D O I：

10.1016/j.biortech.2014.07.073

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

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 degrees 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 degrees 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 1365 m(2) g(-1) at the end of 15 min. (C) 2014 Elsevier Ltd. All rights reserved.

引用

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页码：132 / 137

页数：6

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