Abstract This paper investigates the performance of 25 wt% Ni/GDC catalyst supported on ceramic monolith (MO) and open-cell foam (FO) towards the conversion of CO2 to CH4 at bench-scale level (CO2 flow rate = 78–319 NL·h−1). Both structured catalysts were prepared by the In Situ-Solution Combustion Deposition (IS-SCD) method to coat thin, uniform and high-resistance catalytic layers (Ni/GDC). Catalysts were characterized by XRD, TEM, SEM, and adhesion tests. Temperature profiles in axial and radial direction were registered and discussed. The experimental results highlighted the effect of the geometry of the support on the thermal profile of the catalytic bed and, consequently, on the catalytic performance towards CO2 methanation. For the investigated quasi-adiabatic conditions, the monolith-supported sample enabled a favourable temperature distribution, leading to higher performances (χCO2 = 70.3%; FCH4, OUT = 2.6 NL·cm−3·h−1) compared to the foam-based catalyst (χCO2 = 52.0%, FCH4, OUT = 2.2 NL·cm−3·h−1). Besides, Ni/GDC-MO catalyst showed high stability for 50 h of time-on-stream under daily start-up and shut-down cycles.

中文翻译：

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结构化 Ni/GDC 催化剂上的高温 CO2 甲烷化：电转气应用的性能和放大

摘要 本文研究了负载在陶瓷整料 (MO) 和开孔泡沫 (FO) 上的 25 wt% Ni/GDC 催化剂在实验室规模水平（CO2 流速 = 78–319 NL）将 CO2 转化为 CH4 的性能。 ·h-1)。两种结构催化剂均通过原位溶液燃烧沉积 (IS-SCD) 方法制备，以涂覆薄而均匀的高电阻催化层 (Ni/GDC)。催化剂通过 XRD、TEM、SEM 和附着力测试进行表征。记录和讨论了轴向和径向的温度分布。实验结果强调了载体的几何形状对催化床的热分布的影响，因此，对 CO2 甲烷化的催化性能的影响。对于所研究的准绝热条件，与泡沫基催化剂（χCO2 = 52.0%，FCH4）相比，整体支撑的样品实现了有利的温度分布，从而获得了更高的性能（χCO2 = 70.3%；FCH4，OUT = 2.6 NL·cm-3·h-1） , OUT = 2.2 NL·cm−3·h−1)。此外，Ni/GDC-MO 催化剂在每天的启动和关闭周期下，在 50 小时的运行时间中表现出高稳定性。