Application of high silica zeolite ZSM-5 in a hybrid treatment process based on sequential adsorption and ozonation for VOCs elimination

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• 作者：Hicham Zaitan¹ ; ^{hicham.zaitan@usmba.ac.ma" class="auth_mail" title="E-mail the corresponding author} ; Marie Hé ; lè ; ne Manero² ; ³ ; Hé ; ctor Valdé ; s⁴
• 关键词：Adsorption ; Ozone ; Toluene ; VOCs ; Zeolite
• 刊名：Journal of Environmental Sciences
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：41
• 期：Complete
• 页码：59-68
• 全文大小：703 K

文摘

In this study, a hydrophobic synthetic zeolite, namely ZSM-5 is chosen as an adsorbent/catalyst for toluene removal. Experimental results showed that toluene adsorption onto ZSM-5 was favourable, following a Langmuir adsorption isotherm model. ZSM-5 zeolite was regenerated using gaseous ozone at low temperature. Adsorbed toluene was oxidised, releasing mainly CO₂ and H₂O. Traces of oxidation by-products such as acetic acid and acetaldehyde were formed and remained adsorbed after the oxidativate regeneration with ozone. After four successive cycles of adsorption/ozonation, the adsorption efficiency was not affected (92%–99%). These results showed that volatile organic compound (VOC) removal by adsorption onto ZSM-5 zeolite followed by ozone regeneration could be used as a promising hybrid process for the control of VOC emissions in terms of efficiency.