Abstract The dual role that low-cost dolomite plays as a catalyst and CO2 sorbent in the steam reforming of raw bio-oil has been studied. The reactions were performed in a continuous regime at 700 °C and steam/carbon ratio of 3. The results show that calcined dolomite is a feasible catalyst for producing a H2-rich syngas from raw bio-oil, with efficient CO2 retention and positive impact on the CO2 global emissions balance. Reforming of oxygenates (mainly acids, alcohols and aldehydes) and cracking/hydrogenation of poly-substituted phenols are prevailing reactions during the effective CO2 capture, catalyzed by the CaO and MgO in the dolomite. Consequently, around 40% of bio-oil is converted into a CO2-free syngas with H2 and CO concentrations above 65 vol% and below 20 vol%, respectively, whereas the liquid product is primarily composed of phenol and alkyl-phenols. Products composition changes along reaction by two causes: i) saturation of dolomite by CaO carbonation, which drastically changes the liquid product composition leading to the formation of aromatics by alkyl-phenols hydrodeoxygenation (HDO), activated by the CaCO3 and Fe impurities; ii) coke deposition which involves a progressive decrease in H2/CO ratio (6–2.5 in 4 h) by deactivation of steam reforming and water-gas-shift reactions.

中文翻译：

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白云石在生物油蒸汽重整生产富H2合成气中的双重催化剂-吸附剂作用

摘要 研究了低成本白云石在生物油蒸汽重整过程中作为催化剂和CO2吸附剂的双重作用。反应在 700 °C 和蒸汽/碳比为 3 的连续状态下进行。 结果表明，煅烧白云石是一种可行的催化剂，可用于从原始生物油生产富 H2 合成气，具有有效的 CO2 截留和积极影响关于 CO2 全球排放平衡。含氧化合物（主要是酸、醇和醛）的重整和多取代酚的裂解/氢化是有效捕获 CO2 期间的主要反应，由白云石中的 CaO 和 MgO 催化。因此，大约 40% 的生物油被转化为不含 CO2 的合成气，其中 H2 和 CO 的浓度分别高于 65 vol% 和低于 20 vol%，而液体产品主要由苯酚和烷基苯酚组成。产物组成随反应发生变化的原因有两个：i) CaO 碳酸化使白云石饱和，这极大地改变了液体产物组成，导致由 CaCO3 和 Fe 杂质活化的烷基酚加氢脱氧 (HDO) 形成芳烃；ii) 焦炭沉积，包括通过蒸汽重整和水煤气变换反应的失活来逐渐降低 H2/CO 比（4 小时内 6-2.5）。