期刊
BIOMASS CONVERSION AND BIOREFINERY
卷 8, 期 3, 页码 711-718出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s13399-018-0322-x
关键词
Activated carbon; CO2 activation; Coconut shell; Pore property; Mesoporosity
资金
- Ministry of Science and Technology of Taiwan [MOST 105-2622-E-020-004-CC3]
- Li-Jing Viscarb Co. (Pingtung, Taiwan)
In this work, the pore properties and textural characterization of resulting activated carbons (ACs) derived from dried coconut shell (DCS) were investigated in duplicate using a single-step physical activation process. Based on the thermochemical properties of DCS analyzed, the process features its carbonization temperature of 500 A degrees C at a constant heating rate of 10 A degrees C/min under nitrogen flow, subsequently switched to the gasification with CO2 gas in the ranges of 700-900 A degrees C (activation temperature) and 0-60 min (holding time) in the same reactor. The results showed that the pore properties (including mesoporosity) of resulting AC products, obtained from nitrogen adsorption-desorption isotherm and true density measurements, were on an increasing trend as activation temperature and holding time increased. These findings were attributable to the severe reactions of the lignocellulose-based char with CO2. According to the maximal Brunauer-Emmet-Teller (BET) surface area (E integral 1100 m(2)/g) and mesoporosity percentage (E integral 40%), the optimal activation conditions should be performed at 850 A degrees C for a holding time of 60 min, but will result in relatively low yield. Furthermore, the textural structures and elemental compositions of DCS-based ACs were viewed using the scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) and elemental analysis, showing consistent results as described above.
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