Carbon dioxide (CO₂) sorption-enhanced steam reforming of biogas (SESRB) is a promising approach for the production of hydrogen (H₂). This method applies hybrid dual-functional materials comprising a reforming catalyst and a CO₂ chemisorbent. Biogas, produced from the anaerobic digestion of biowaste, is an alternative feedstock for H₂ production. In this work, H₂ was produced from a simulated biogas mixture (CH₄ = 60 vol %, CO₂ = 40 vol %) in a fixed-bed reactor using a hybrid material (HM) comprising a nickel (Ni) catalyst and a calcium oxide sorbent. Using several techniques such as X-ray diffraction, X-ray photoelectron spectroscopy, electron microscopy, and nitrogen adsorption–desorption, HM was comprehensively studied. Material performance was tested in the 650–850 °C range using feeds with varying S/M ratios (steam-to-methane, 1.5–7.5 mol/mol). High S/M ratio and low gas hourly space velocity facilitated H₂ production from SESRB. Both H₂ purity (88 mol %) and CH₄ conversion (93 mol %) were high at 850 °C. HM endured 15 reaction-regeneration cycles and loaded 7 mol of CO₂/kg sorbent. Thus, SESRB is attractive for the sustainable production of H₂ from biogas.

中文翻译：

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利用含氧化钙吸附剂的镍基混合材料对沼气进行二氧化碳吸附强化蒸汽重整制氢


二氧化碳（CO ₂ ）吸附增强沼气蒸汽重整（SESRB）是一种有前途的生产氢气（H ₂ ）的方法。该方法应用包含重整催化剂和CO ₂ 化学吸附剂的混合双功能材料。沼气由生物废物厌氧消化产生，是生产 H ₂ 的替代原料。在这项工作中，H ₂ 是由模拟沼气混合物（CH ₄ = 60 vol %，CO ₂ = 40 vol %）在固定装置中生产的。使用包含镍（Ni）催化剂和氧化钙吸附剂的混合材料（HM）的床反应器。利用X射线衍射、X射线光电子能谱、电子显微镜、氮气吸附-脱附等多种技术对HM进行了综合研究。使用具有不同 S/M 比率（蒸汽与甲烷，1.5–7.5 mol/mol）的进料，在 650–850 °C 范围内测试材料性能。高S/M比和低气时空速有利于SESRB产生H ₂ 。在 850 °C 时，H ₂ 纯度（88 mol%）和 CH ₄ 转化率（93 mol%）都很高。 HM经历了15次反应再生循环并负载了7mol CO ₂ /kg吸附剂。因此，SESRB 对于从沼气中可持续生产 H ₂ 具有吸引力。