Phuong Lan Tran-Nguyen, Kim-Phung Ly, Luong Huynh Vu Thanh, Artik Elisa Angkawijaya, Shella Permatasari Santoso, Nguyen-Phuong-Dung Tran, Meng-Lin Tsai, Yi-Hsu Ju
Rice husk ash (RHA) is an abundant agricultural waste in Mekong Delta, Vietnam. The utilization of RHA for zeolites production has been widely studied by pretreating RHA before reaction. In this study, zeolite NaX was synthesized directly using RHA without any pretreatment. Key parameters including molar ratios of SiO2 to Al2O3 and Na2O to Al2O3, reaction time, and aging time were investigated. The results showed that the optimal conditions for the synthesis of zeolite NaX are: molar ratio of SiO2/Al2O3 = 4, molar ratio of Na2O/Al2O3 = 10, reaction time = 4 h, and without aging. Zeolite NaX with a specific surface area of 388 m2/g and a pore diameter of 12.37 Å was obtained, which were comparable to the published data. The method developed in this work is an energy and time saving, integrated, and environmental friendly process. It has the potential to be applied for synthesizing other types of zeolite. © 2021 Taiwan Institute of Chemical Engineers
Department of Mechanical Engineering, Can Tho University, Campus II, 3/2 street, Can Tho city, 900100, Viet Nam; Department of Chemical Engineering, Can Tho University, Campus II, 3/2 street, Can Tho city, 900100, Viet Nam; Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, #43, Sec. 4, Keelung Rd., Taipei, 10607, Taiwan; Department of Chemical Engineering, Widya Mandala Surabaya Catholic University, Kalijudan 37, Surabaya, 60133, Indonesia; Department of Materials Science and Engineering, National Taiwan University of Science and Technology, #43, Sec. 4, Keelung Rd., Taipei, 10607, Taiwan; Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Keelung Rd. Sec. 4, Taipei, 10607, Taiwan