In this study the rice husk has been subjected to two-stage gasification to obtain syngas, tar and char. The rice husk char is subjected to alkaline extraction to obtain amorphous silica and activated carbon. The products have been characterized by methods such as BET, FTIR and XRF. The silica obtained from acid leached rice husk has BET specific surface area of 311.68 m²/g and purity of 88.85%. The BET specific surface area of activated char increase from 102.49 m²/g to 567.03 m²/g after the activation process. The silica extraction using carbon dioxide (CO₂) precipitation is found to be more profitable than acid precipitation.

中文翻译：

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由两步气化过程得到的稻壳炭制无定形二氧化硅和活性炭

在这项研究中，稻壳已经过两阶段气化以获得合成气，焦油和焦炭。将稻壳炭进行碱萃取以获得无定形二氧化硅和活性炭。产品已通过BET，FTIR和XRF等方法进行了表征。由酸浸过的稻壳得到的二氧化硅的BET比表面积为311.68m ² / g，纯度为88.85％。活化过程后，活性炭的BET比表面积从102.49 m ² / g增加到567.03 m ² / g。发现使用二氧化碳（CO ₂）沉淀法进行二氧化硅萃取比酸沉淀法更有利。