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

• Published in: Journal of environmental sciences (China) Vol. 41; no. 3; pp. 59 - 68
• Main Authors: Zaitan, Hicham, Manero, Marie Hélène, Valdés, Héctor
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01-03-2016; Elsevier
• Subjects: Adsorption; Air Pollution - prevention & control; Catalysis; Chemical and Process Engineering; Chemical engineering; Chemical Sciences; Engineering Sciences; Environmental Pollutants - chemistry; Oxidation-Reduction; Ozone; Ozone - chemistry; Toluene; Toluene - chemistry; VOCs; Volatile Organic Compounds - chemistry; Zeolite; Zeolites - chemistry; ZSM-5沸石; 吸附剂; 挥发性有机化合物; 混合处理; 臭氧气体; 高硅沸石; VOCs; Ozone; Zeolite; Adsorption; Toluene
• ISSN: 1001-0742; 1878-7320
• DOI: 10.1016/j.jes.2015.05.021

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 CO_2 and H_2O.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.