The aim of this work is to identify the effect of the CaO phase as a CO₂ sorbent and mayenite (Ca₁₂Al₁₄O₃₃) as a stabilizing phase in a bi-functional material for CO₂ capture in biomass syngas conditioning and cleaning at high temperature. The effect of different CaO weight contents is studied (0, 56, 85, 100 wt%) in sorbents synthesized by the wet mixing method. These high temperature solid sorbents are upgraded to bi-functional compounds by the addition of 3 or 6 wt% of nickel chosen as the metal active phase. N₂ adsorption, X-ray diffraction, scanning electronic microscopy, temperature-programmed reduction analyses and CO₂ sorption study were performed to characterize structural, textural, reducibility and sorption properties of bi-functional materials. Finally, sorption-enhanced reforming of toluene (chosen as tar model), of methane then of methane and toluene with bi-functional compounds were performed to study the best material to improve H₂ content in a syngas, provided by steam biomass gasification. If the catalytic activity on the sorption enhanced reforming of methane exhibits a fast fall-down after 10–15 min of experimental test, the reforming of toluene reaches a constant conversion of 99.9% by using bi-functional materials.

中文翻译：

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用于生物质气化富 H2 气体的双功能催化剂/吸附剂

这项工作的目的是确定 CaO 相作为 CO ₂吸附剂和钙铝石（Ca ₁₂ Al ₁₄ O ₃₃）作为双功能材料中稳定相的效果，用于在生物量合成气调节和清洁中捕获CO ₂高温。研究了不同 CaO 重量含量 (0, 56, 85, 100 wt%) 在湿混合法合成的吸附剂中的影响。通过添加 3 或 6 重量％的镍作为金属活性相，这些高温固体吸附剂升级为双功能化合物。N ₂吸附、X 射线衍射、扫描电子显微镜、程序升温还原分析和 CO ₂进行吸附研究以表征双功能材料的结构、质地、还原性和吸附特性。最后，进行甲苯（选择为焦油模型）、甲烷、甲烷和甲苯与双官能化合物的吸附增强重整，以研究提高由蒸汽生物质气化提供的合成气中H ₂含量的最佳材料。如果吸附增强甲烷重整的催化活性在实验测试 10-15 分钟后表现出快速下降，则通过使用双功能材料，甲苯重整达到 99.9% 的恒定转化率。