ZSM-5 Supported Mn, Mn-Ag, Mn-Cu for AmbientTemperature Isopropyl Alcohol Adsorption and OzoneAssisted Regeneration Process

Abstract

Metal and bi-metal catalysts supported by ZSM-5 zeolite (Mn/ZSM-5, Mn-Ag/ZSM-5, and Mn-Cu/ZSM-5 ) were synthesized using a simple impregnation method. Various analytical techniques, including XRD, SEM, and EDS, were employed to evaluate the crystal structure, morphology, and elemental distribution of the materials. Subsequently, different catalysts were used to evaluate the adsorption capacity of isopropanol (IPA) as well as the regeneration efficiency using ozone in-situ. With an initial concentration of isopropanol gas of 2000ppmv, 0.5 g of catalyst, and a flow rate of 100 mL/min, Mn − Ag bimetal-supported zeolite showed the highest notable efficiency of the adsorption process of 89.06mg/g. Furthermore, the manganese metal-supported zeolite preserved approximately 60% and 70% of its ozone regeneration capacity during several consecutive cycles with a 1 L/min ozone flowrate and 10 - and 60 -minute O3 treatments, respectively. Additionally, the catalyst can increase efficiency up to 80% after four cycles when the ozone flowrate is doubled in 10 minutes. This innovative adsorption-regeneration method of gas treatment can benefit the environment by minimizing energy consumption, reducing the need for high-temperature treatments, and lowering overall energy requirements, potentially influencing the future development of metal and bi-metal catalysts for treating various volatile organic compounds.

Keywords

• zeolite
• isopropyl alcohol removal
• dynamic adsorption
• ozonation
• impregnation