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Extraction of silica from cogon grass and utilization for synthesis of zeolite NaY by conventional and microwave-assisted hydrothermal methods
Journal of the Taiwan Institute of Chemical Engineers ( IF 5.7 ) Pub Date : 2017-12-11 , DOI: 10.1016/j.jtice.2017.11.024
Komsan Bunmai , Nattawut Osakoo , Krittanun Deekamwong , Wina Rongchapo , Chalermpan Keawkumay , Narong Chanlek , Sanchai Prayoonpokarach , Jatuporn Wittayakun

High purity silica is obtained after leaching glassy blade and trunk of cogon grass in HCl acid with various concentrations (1.5, 2.0, 2.5 and 3.0 M) and calcination at 500 °C for 4 h. The silica yield from the blade from all acid-leached samples is around 9 wt%, higher than that from the trunk (around 4 wt%). The sample leached with 2 M HCl has the highest silica purity (99.34 ± 0.02 wt%) and is further used in the syntheses of zeolite NaY by conventional and microwave-assisted hydrothermal methods (CH and MH). The NaY-CH has a larger particle size, BET surface area and total acidity than that NaY-MH. Interestingly, the NaY-MH has a larger external surface area and stronger acid strength.



中文翻译:

常规和微波辅助水热法从co草中提取二氧化硅并用于合成NaY沸石

在高浓度的盐酸(1.5、2.0、2.5和3.0 M)中浸没co草的玻璃状叶片和树干后,在500°C下煅烧4 h,即可得到高纯度的二氧化硅。来自所有酸浸样品的叶片二氧化硅产率约为9 wt%,高于来自树干的二氧化硅产率(约为4 wt%)。用2 M HCl浸出的样品具有最高的二氧化硅纯度(99.34±0.02 wt%),并通过常规和微波辅助水热法(CH和MH)进一步用于合成NaY沸石。NaY-CH比NaY-MH具有更大的粒径,BET表面积和总酸度。有趣的是,NaY-MH具有更大的外表面积和更强的酸强度。

更新日期:2017-12-11
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