Process intensification methods in steam reforming of ethanol with novel catalysts: Microwave heating and sorption enhanced reforming

Date

2024-6

Author

Sarıyer, Merve

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Due to the depletion of fossil fuels and the increase in the amount of hazardous gases such as carbon dioxide and methane, which contributes to the greenhouse effect and global warming, the need for clean and environmentally friendly energy carriers and resources is increasing. Hydrogen can be used as a fuel substitute for fuel cells and electricity generation, making it a promising and environmentally benign energy carrier. In this study, it was aimed to produce hydrogen-rich gas through steam reforming and sorption-enhanced steam reforming (SESRE) of ethanol in both the microwave and conventional heated reactors with the nickel-impregnated commercial mesoporous carbon (Ni-MC), silica aerogel (Ni-SA) and carbon-coated monolith (Ni-CCM) catalysts. The high performance of the microwave system has been proven in terms of the hydrogen yield and purity compared to the conventional system with all catalysts. When the synthesized catalysts were evaluated in terms of hydrogen yield and purity, it was observed that the best catalyst was the Ni-SA catalyst in the microwave system and the Ni-CCM catalyst in conventional system. Moreover, with the use of microwave heating, no coke formation was observed at 500°C and 600°C with the Ni-SA catalyst. Using the Ni-MC catalyst, SESRE resulted in product distribution with very high hydrogen purity (over 97 %), containing no CO and CO2 before the breakthrough point in microwave system at 500°C. On the other hand, with the Ni-SA catalyst, the mole percentage of the hydrogen reached approximately 90 % in the first 45 min in the SESRE in the microwave system at 400°C.

Subject Keywords

Steam Reforming of Ethanol, Catalyst, Microwave Heating, Process Intensification, Hydrogen

URI

https://hdl.handle.net/11511/110137

Collections

Graduate School of Natural and Applied Sciences, Thesis