Toluene abatement from polluted air over CeO2-doped Pd/Al2O3-clinoptilolite nanocatalyst via low temperature catalytic oxidation
Subject Areas :
1 - کارشناس ارشد مهندسی شیمی، دانشکده مهندسی شیمی، دانشگاه صنعتی سهند، شهر جدید سهند، تبریز، ایران
2 - استاد مهندسی شیمی، مرکز تحقیقات راکتور و کاتالیست، دانشگاه صنعتی سهند، شهر جدید سهند، تبریز، ایران
Keywords: Tailing dams, Ahangaran mine, Silver extraction, Acid leaching, Cyanidation process,
Abstract :
Technologies such as thermal and catalytic oxidation or biological treatment are used to remove or reduce volatile organic compounds (VOCs) which are a major part of air pollutants. Nowadays use of nanocatalysts to remove environmental pollutants are highly regarded. In this work, the composite of Al2O3/CeO2/Clinoptilolite was synthesized, and then palladium active phase has been loaded on it by ultrasonic irradiation. Ultrasonic irradiation causes the profit description of active metal and improves structural properties of nanocatalysts. The purpose of using this catalyst is to take advantage of high specific surface area of alumina, acidic characteristic of clinoptilolite, and unique properties of CeO2 at the same time. Existence of CeO2 in catalyst causes increasing storage of oxygen, improving thermal and structural stability of composite and appropriate distribution of palladium metal on it. Characteristics of nanocatalysts are determined by XRD, FESEM, BET, FTIR, and EDX analyses. Gas chromatography and catalytic oxidation pilot are used for evaluation of catalytic performance toward toluene abatement from polluted air. XRD analysis results showed that the nanocatalysts have nanometer dimension crystals. BET analysis showed that the synthesized nanocatalysts have high specific surface areas. The reactor test results confirmed that the composite nanocatalysts have activity and absorption ability on toluene abatement.
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