Employing a series of Cu-MnO_x supported catalysts, this work investigates for the first time the impact on the RWGS reaction rate obtained under simulated residual CO₂-rich feed streams, i.e., when CO and CH₄ species are added to the reaction atmosphere. For this purpose, a simulated gaseous stream was prepared based on real biomass processing results. First, the series of catalysts was assessed under diluted ideal conditions (i.e., a mixture of only CO₂ and H₂ with N₂ as dilutant). Here, the catalysts’ performance depended on both metal size and surface basic sites. Still, as the CO₂ partial pressure was increased (varying the H₂:CO₂ ratio), the Cu metal dispersion seemed the catalyst feature governing RWGS reaction rate. Values of CO₂ conversion from 50 to 60 % were registered for the different catalysts at a ratio H₂:CO₂ of 4. Then, under simulated residuals conditions and aside of thermodynamic limitations, the achievement of improved catalyst performances also depended on the catalysts’ reactivity towards the oxidation of CH₄ fractions. For (X wt.%) Cu - (10 wt.%) MnO_x/Al₂O₃ catalysts, 10 wt.% Cu was determined as the optimal Cu content. With this selected value, over the different analyzed supports (γ-Al₂O₃, (5 wt.%) SiO₂-Al₂O₃, (40 wt.%) SiO₂-Al₂O₃ and (20 wt.%) CeO₂-Al₂O₃), the highest conversion rates with values of CO₂ conversion of ca. 50 % at the higher temperature and optimal catalyst stabilities attained by the ceria supported catalyst (close to 95 % at most of the reaction temperatures) were ascribed to the optimal particle sizes and promoted CH₄ activation processes.

采用一系列 Cu-MnO _x负载催化剂，这项工作首次研究了在模拟的富含 CO _{2 的}残留进料流下获得的 RWGS 反应速率的影响，即当 CO 和 CH ₄物种添加到反应气氛中时. 为此，基于真实的生物质加工结果制备了模拟气流。首先，在稀释的理想条件（即，仅CO ₂和H ₂的混合物，N ₂作为稀释剂）下评估该系列催化剂。在这里，催化剂的性能取决于金属尺寸和表面碱性位点。尽管如此，随着 CO ₂分压的增加（改变 H ₂:CO ₂比率），Cu 金属分散体似乎是控制 RWGS 反应速率的催化剂特征。在 H ₂ :CO ₂为 4的比率下，记录了不同催化剂的 CO ₂转化率从 50% 到 60% 的值。然后，在模拟残留条件下，除了热力学限制外，提高催化剂性能的实现也取决于催化剂' 对 CH ₄馏分氧化的反应性。对于(X wt.%) Cu - (10 wt.%) MnO _x /Al ₂ O ₃催化剂，10 wt.% Cu被确定为最佳Cu含量。使用此选定值，在不同的分析载体 (γ-Al ₂ O ₃, (5 wt.%) SiO ₂ -Al ₂ O ₃ , (40 wt.%) SiO ₂ -Al ₂ O ₃和 (20 wt.%) CeO ₂ -Al ₂ O ₃ )，转化率最高的 CO ₂转化约。在较高温度下 50% 和由氧化铈负载的催化剂获得的最佳催化剂稳定性（在大多数反应温度下接近 95%）归因于最佳粒度并促进了 CH ₄活化过程。