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SYNTHESIS AND CHARACTERIZATION OF SOLAR PYROLYZED RICE HUSK ASH AS A CATALYST SUPPORT
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Oğuzhan Coşğun MSc Thesis.pdf
Date
2024-12-27
Author
Coşğun, Oğuzhan
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Rice husk ash was produced and characterized by solar pyrolysis method in this study, and its utilization as a catalyst support was investigated. Results were compared with industrially produced flame pyrolyzed rice husk ash samples to observe the effect of solar pyrolysis. For that purpose, solar pyrolysis of rice husk was conducted and several samples with varying carbon contents were produced. Flame and solar pyrolyzed samples were thoroughly characterized. Stability of the samples were investigated by thermal gravimetric analysis and temperature programmed reduction. Morphology was studied with scanning electron microscopy and Brunauer-Emmett-Teller analysis. Surface characterization was performed by electron spin resonance spectroscopy, nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, and X-ray diffraction crystallography. Adsorption isotherms were measured with acidic carbon dioxide and basic ammonia gases. Catalyst was prepared by incipient wetness impregnation method, and used in temperature programmed reduction analysis in the presence of hydrogen. Results indicate solar pyrolysis to be an effective method to produce rice husk ash with high stability and hierarchical porosity where carbon content, porosity, and free electron density can be engineered by manipulating the exposure time to concentrated solar energy. Temperature programmed studies show rice husk ash to be a stable support for palladium catalysts in the presence of hydrogen.
Subject Keywords
Rice Husk Ash
,
Catalyst Support
,
Characterization
,
Spectroscopy
,
Carbon
URI
https://hdl.handle.net/11511/113366
Collections
Graduate School of Natural and Applied Sciences, Thesis
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O. Coşğun, “SYNTHESIS AND CHARACTERIZATION OF SOLAR PYROLYZED RICE HUSK ASH AS A CATALYST SUPPORT,” M.S. - Master of Science, Middle East Technical University, 2024.
