Co2 Adsorption Analysis Of Cation Exchanged Mordenite-Type Zeolite With Alkali And Alkaline Earth Metal

Yeoh, Zhi Yi (2020) Co2 Adsorption Analysis Of Cation Exchanged Mordenite-Type Zeolite With Alkali And Alkaline Earth Metal. Final Year Project, UTAR.

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Abstract

In this project, the mordenite-type (MOR) zeolite with Si/Al ratio around 5 was used for the CO2 adsorption analysis. The impact of different temperatures and cation exchange with alkali and alkaline earth metals on CO2 adsorption of MOR zeolite adsorbent were analysed using Thermogravimetric Analyser (TGA). Raw mordenite (R-MOR) zeolite exhibited the highest maximum CO2 adsorption capacity of 0.1198 mmol/g, highest maximum CO2 adsorption rate of 0.0020 mmol/(g•min), maximum N2 adsorption capacity of 1.0201 mmol/g and highest maximum CO2/N2 selectivity of 0.1175 at 30 °C. The CO2 adsorption properties of R-MOR zeolite were decreased with a rise of temperature. The kinetic study of CO2 adsorption at different temperatures revealed that R-MOR followed pseudo-first order model at 30 °C; intra-particle diffusion model at 50 °C and 100 °C. Since, R-MOR zeolite exhibited the best performance at 30 °C, following R-MOR zeolite was cation exchanged with alkali and alkaline earth metals and tested at 30 °C. The maximum CO2 adsorption capacity and maximum CO2 adsorption rate of the adsorbents followed an order of Ca-MOR> Mg-MOR> Na-MOR> K-MOR> R-MOR. CaMOR zeolite showed the highest maximum CO2 adsorption capacity of 0.4478 mmol/g, highest maximum CO2 adsorption rate of 0.0075 mmol/(g•min), least maximum N2 adsorption capacity of 0.2168 mmol/g and highest maximum CO2/N2 selectivity of 2.0655 at 30 °C. The X-ray diffraction (XRD) test confirmed the characteristic peaks of the adsorbents before and after cation exchanged were consistent with reference peaks of mordenite zeolite provided in International Zeolite Association. Fourier-transform infrared spectroscopy (FTIR) test exhibited the essential peaks for zeolite material and CO2 adsorbed peaks in the adsorbents. The structure of the adsorbents showed in Scanning Electron Microscope (SEM) test were nanofiber-like crystal and some amorphous globules made of entangled zeolite fibres. The Energy Dispersive X-ray Analyzer (EDX) result revealed that the adsorbents had a better affinity towards K+ during cation exchange.

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