Resolving the temperature profile in catalytic fixed bed reactors is essential for the investigation of reactions. However, this is not readily possible at laboratory scale without affecting the flow regime. Thermography tracks temperature profiles contactless with a high spatial resolution and without influencing the flow regime in the reactor. This study applies thermography for a powder fixed bed reactor at laboratory scale. A pa​rameter investigation was conducted to identify the dependency of hot spot temperatures during the highly exothermic CO₂ methanation reaction on major process parameters like reactant gas dilution, volume flow and cooling temperature. Further, the impact of an upstream cold bed on the temperature distribution in the catalytic bed was investigated. It was found that the cold bed was able to remove the heat of reaction efficiently to prolong an overheating of the catalyst bed. Thermography was also used to study a dynamic phenomenon, namely the in situ sulfur poisoning of a nickel-alumina catalyst. The temperature of the fixed bed was thereby spatially resolved at any point in time during the reaction. It was found that poisoning causes the reactive zone to move through the catalytic bed at a constant velocity. A simple poisoning model was applied to correlate the observed moving velocity to the catalyst's specific active surface area as determined by static H₂ chemisorption at room temperature.

解决催化固定床反应器中的温度曲线对于研究反应至关重要。然而，在实验室规模上不影响流动状态是不可能的。热成像技术以高空间分辨率跟踪非接触式温度分布，并且不影响反应器中的流动状态。这项研究将热成像技术应用于实验室规模的粉末固定床反应器。进行了一项参数研究，以确定高放热的CO ₂期间热点温度的依赖性甲烷化反应的主要工艺参数如反应气体稀释度，体积流量和冷却温度。此外，研究了上游冷床对催化床中温度分布的影响。发现冷床能够有效地除去反应热，以延长催化剂床的过热。热成像还用于研究动态现象，即镍-氧化铝催化剂的原位硫中毒。固定床的温度由此在反应过程中的任何时间点在空间上得以分辨。发现中毒导致反应区以恒定速度移动通过催化床。应用了简单的中毒模型，以将观察到的移动速度与由静态H确定的催化剂的比活性表面积相关联₂在室温下化学吸附。