Removal of Gas-Phase As2O3 by Metal Oxide Adsorbents: Effects of Experimental Conditions and Evaluation of Adsorption Mechanism

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• 作者：Yue Zhang ; Chunbo Wang ; Wenhan Li ; Huimin Liu ; Yongsheng Zhang ; Pauline Hack ; Weiping Pan
• 刊名：Energy & Fuels
• 出版年：2015
• 出版时间：October 15, 2015
• 年：2015
• 卷：29
• 期：10
• 页码：6578-6585
• 全文大小：370K
• ISSN：1520-5029

文摘

This research studies the adsorption of gas-phase As₂O₃ by CaO, Fe₂O₃ and Al₂O₃, using a fixed-bed reactor with an arsenic continuous generation device. The adsorption of gas-phase arsenic on CaO and Fe₂O₃ is mainly chemical adsorption at 600鈥?00 掳C. The adsorption quantity and efficiency decreases as the temperature increases. Iron(III) oxide has the best arsenic adsorption ability, followed by calcium oxide and then aluminum oxide. The incoming arsenic concentration was varied, from 4.5 脳 10^鈥? v/v to 13.5 脳 10^鈥? v/v, to determine if this had any effect on adsorption, which revealed that the adsorbent did not become saturated under the experimental conditions used. The adsorption efficiency for each adsorbent was affected by the adsorption temperature, and the same adsorption efficiency was achieved regardless of the inlet arsenic concentration. Intrinsic reaction kinetics of CaO and Fe₂O₃ with arsenic oxide was studied. The activation energies of CaO and Fe₂O₃ are 12.17 kJ/mol and 25.99 kJ/mol, respectively. The reaction orders of Fe₂O₃ and CaO are 鈭?.1 and 0.8, respectively.