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This research studies the adsorption of gas-phase As 2 O 3 by CaO, Fe 2 O 3 and Al 2 O 3, using a fixed-bed reactor with an arsenic continuous generation device. The adsorption of gas-phase arsenic on CaO and Fe 2 O 3 is mainly chemical adsorption at 600–900 °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 × 10 –6 v/v to 13.5 × 10 –6 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 Fe 2 O 3 with arsenic oxide was studied. The activation energies of CaO and Fe 2 O 3 are 12.17 kJ/mol and 25.99 kJ/mol, respectively. The reaction orders of Fe 2 O 3 and CaO are ∼1.1 and 0.8, respectively.
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Zhang et al. (2015) studied this question.
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