Bio-Circular-Green-economy Technology & Engineering Center, BCGeTEC, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand.
Center of Excellence on Catalyst and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand.
Molecules. 2020 Sep 5;25(18):4063. doi: 10.3390/molecules25184063.
The porous carbon (bacterial cellulose (BC)-activated carbon (AC)(BA)) prepared via two-step activation of bacterial nanocellulose by treatments with potassium hydroxide (KOH) and then phosphoric acid (HPO) solutions showed superior adsorption properties and effective performance as catalyst support. BC-AC(BA) had an open and interconnected multi-porous structure, consisting of micropores (0.23 cm/g), mesopores (0.26 cm/g), and macropores (4.40 cm/g). The BET surface area and porosity were 833 m/g and 91.2%, respectively. The methylene blue adsorption test demonstrated that BC-AC(BA) was superior in its mass transfer rate and adsorption capacities. Moreover, BC-AC(BA) modified by HPO treatment showed a significant enhancement of catalytic performance for dehydration of ethanol. At the reaction temperature of 250-400 °C, 30P/BC-AC(BA) gave ethanol conversion at 88.4-100%, with ethylene selectivity of 82.6-100%, whereas, high selectivity for diethyl ether (DEE) at 75.2%, at ethanol conversion of 60.1%, was obtained at the reaction temperature of 200 °C.
通过两步法处理细菌纳米纤维素，先用氢氧化钾（KOH）处理，再用磷酸（HPO）处理，制备出多孔碳（细菌纤维素（BC）-活性炭（AC）（BA）），这种多孔碳具有优越的吸附性能和作为催化剂载体的有效性能。BC-AC（BA）具有开放且相互连接的多微孔结构，由微孔（0.23 cm/g）、中孔（0.26 cm/g）和大孔（4.40 cm/g）组成。BET 比表面积和孔隙率分别为 833 m/g 和 91.2%。亚甲基蓝吸附试验表明，BC-AC（BA）在传质速率和吸附容量方面表现出色。此外，经 HPO 处理修饰的 BC-AC（BA）表现出对乙醇脱水反应显著增强的催化性能。在 250-400°C 的反应温度下，30P/BC-AC（BA）的乙醇转化率为 88.4-100%，乙烯选择性为 82.6-100%，而在 200°C 的反应温度下，乙醇转化率为 60.1%时，二乙醚（DEE）的选择性高达 75.2%。
