Cyclic performance of coke oven gas - Steam reforming with assistance of steel slag derivates for high purity hydrogen production

Baoxu Zhang, Yumin Chen, Bing Zhang, Ruifeng Peng, Qiancheng Lu, Weijie Yan, Bo Yu, Fang Liu and Junying Zhang

Renewable Energy, 2022, vol. 184, issue C, 592-603

Abstract: Steel slag-derived CaO (CaO(SS)) was applied in cyclic sorption enhanced steam reforming of coke oven gas process (cyclic SE-SRCOG) for high-purity hydrogen production. Effects of leaching acid concentration on the cyclic CO2 capture capacity of CaO(SS) were investigated. Using 1 mol/L acetic acid solution as leaching solution, the prepared CaO-based sorbent showed a stable CO2 capture capacity of 0.27 gCO2/gCaO after 35 sorption-desorption cycles. Impacts of operating modes (with different particles contents and loading patterns), operating procedure, and leaching residue (LR) blending on cyclic SE-SRCOG performance were experimentally investigated in detail. Combined catalyst-sorbent by adhesively tableting exhibited the worst stability due to loss of Ni active sites, caused by severe sintering and coverage by CaCO3. With a reforming temperature of 600 °C, cyclic SE-SRCOG with layered packing catalyst-sorbent particles could achieve H2 purity of 95% and CH4 conversion of 87% at the 5th cycle, and they were still maintained to be 87% and 65% at the 10th cycle, respectively. In operating mode using layered packed catalyst-sorbent particles, integration of LR into the sorbent facilitated further improvements of CH4 conversion to 86% at the 10th cycle, mainly due to that LR could act as catalytic promoters of SRCOG and sintering-resistance spacers of CaO(SS).

Keywords: Hydrogen production; Coke oven gas; Sorption-enhanced steam reforming; Steel slag; Cyclic stability (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:184:y:2022:i:c:p:592-603

DOI: 10.1016/j.renene.2021.11.123

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