Hydrogen production via steam reforming of coke oven gas enhanced by steel slag-derived CaO
| Autor: | Yumin Chen, Bokai Kang, Zhipeng Li, Ruifeng Peng, Weijie Yan, Qian Jianfeng, Junying Zhang, Feiqiang Guo, Baoxu Zhang, Xing Chuai |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Sorbent Hydrogen Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Methane law.invention Catalysis Steam reforming chemistry.chemical_compound law Calcination Hydrogen production Renewable Energy Sustainability and the Environment business.industry 021001 nanoscience & nanotechnology Condensed Matter Physics Steelmaking 0104 chemical sciences Fuel Technology chemistry Chemical engineering 0210 nano-technology business |
| Zdroj: | International Journal of Hydrogen Energy. 45:13231-13244 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2020.03.061 |
| Popis: | Steel slag, a waste from steelmaking plant, has been proven to be good candidate resources for low-cost calcium-based CO2 sorbent derivation. In this work, a cheap and sintering-resistance CaO-based sorbent (CaO (SS)) was prepared from low cost waste steel slag and was applied to enhance catalytic steam reforming of coke oven gas for production of high-purity hydrogen. This steel slag-derived CaO possessed a high and stable CO2 capture capacity of about 0.48 g CO2/g sorbent after 35 adsorption/desorption cycles, which was mainly ascribed to the mesoporous structure and the presence of MgO and Fe2O3. Product gas containing 95.8 vol% H2 and 1.4 vol% CO, with a CH4 conversion of 91.3% was achieved at 600 °C by steam reforming of COG enhanced by CaO (SS). Although high temperature was beneficial for methane conversion, CH4 conversion was remarkably increased at lower operation temperatures with the promotion effects from CaO (SS), and CO selectivity has been also greatly decreased. Reducing WHSV could increase methane conversion and reduce CO selectivity due to longer reactants residence time. Reducing C/A could increase methane conversion and hydrogen recovery factor, and also decrease CO selectivity. When being mixed with catalyst during SE-SRCOG, CaO (SS) with a uniform size distribution favored methane conversion due to the high utilization efficiency of catalyst. Promising stability of CaO (SS) in cyclic reforming/calcination tests was evidenced with a hydrogen recovery factor >2.1 and CH4 conversion of 82.5% at 600 °C after 10 cycles using CaO (SS) as sorbent. |
| Databáze: | OpenAIRE |
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