Use of building wastes and red mud as CO2 sorbent and catalyst for the production of hydrogen
In the context of low-carbon and circular economy, this study aimed to develop a method for producing biofuels rich in hydrogen, using exclusively waste materials as energy sources or beneficial additives. Selected materials were forest and agricultural wastes as feedstocks, as well as de...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Academia.edu Journals
2024-07-01
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| Series: | Academia Green Energy |
| Online Access: | https://www.academia.edu/121752605/Use_of_building_wastes_and_red_mud_as_CO2_sorbent_and_catalyst_for_the_production_of_hydrogen |
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| Summary: | In the context of low-carbon and circular economy, this study aimed to develop a method for producing biofuels rich in hydrogen, using exclusively waste materials as energy sources or beneficial additives. Selected materials were forest and agricultural wastes as feedstocks, as well as demolition wastes from construction activities and red mud (RM) waste from the aluminum industry as a novel CO2 sorbent and catalyst, respectively. The experiments were carried out in a fixed-bed gasification system under a steam atmosphere and a thermogravimetric-mass spectrometric unit. The effects of temperature, sorbent/fuel ratio, and catalyst loading on final conversion, product gas composition and heating value, hydrogen yield, and energy recovery were examined, and optimum conditions were determined. At 750°C, Ca/C = 1, and RM loading 20–30% wt, the amount of CO2 captured by the building demolition waste sorbent was 76.5–81.2%, the molar fraction of hydrogen in the product gas 74.8–77.1% mol (raised up to 77% as compared to reaction without sorbent or catalyst), the hydrogen yield 1.31–2.08 m3/kg, the higher heating value (HHV) of gas 13.4–13.6 MJ/m3, and fuel conversion 71–100%. For the same proportions of sorbent and catalyst at 850°C, 64.3–77.8% of CO2 was captured, the hydrogen concentration in product gas was 76.6–79.8% mol, the yield was 1.5–2.35 m3/kg, the HHV of gas was 12.4–13.2 MJ/m3, and the conversion of organic matter was 88.1–100%. |
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| ISSN: | 2998-3665 |