Synthesis,characterization and CO2 adsorption of NaA,NaX and NaZSM-5 from rice husk ash |
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| Affiliation: | 1. Department of Physics, Coimbatore Institute of Technology, Coimbatore 641014, India;2. Department of Physics, Dr. N.G.P. Arts and Science College, Coimbatore 641048, India;3. Department of Physics, Chikkanna Government Arts College, Tirupur 641602, India;4. Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam;5. Center for Transdisciplinary Research (CFTR), Department of Pharmacology, Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, India;6. College of Medical and Health Science, Asia University, Taichung, Taiwan;7. School of Renewable Energy, Maejo University, Chiang Mai 50290, Thailand;8. Department of Engineering and Science, Western Norway University of Applied Sciences, Bergen 5063, Norway |
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| Abstract: | NaA, NaX and NaZSM-5 zeolites were prepared by using silica extracted from rice hull ash as a raw material, and they were investigated for CO2 adsorption performance as an adsorbent in order to solve the problem of suppressing the global warming. Three zeolites were synthesized by hydrothermal methods with seed technology, and a series of characterization methods, including XRD, FTIR, nitrogen adsorption-desorption and SEM, were used to demonstrate their advantages compared to traditional hydrothermal methods. The maximum equilibrium adsorption capacity of NaA-RS, NaX-RS and NaZSM-5-RS was 1.46, 3.12 and 2.20 mmol/g at 0 °C and 101.3 kPa, respectively. The CO2 and N2 adsorption isotherms recorded at different temperatures were perfectly fitted by the Dual-site Langmuir model. The CO2/N2 selectivity and Henry's law constants were calculated to demonstrate that the samples have a stronger affinity for CO2, especially at low pressures. The isosteric heat of CO2 and N2 adsorption of the three zeolites was calculated, which was indicated that they were in an excellent potential for adsorption and separation of CO2 in industrial flue gas. |
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| Keywords: | Zeolite Rice husk ash Selectivity Adsorption thermodynamics |
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