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

被引：129
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
收藏
页码：132 / 137
页数：6
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