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Catalyst State Diagnosis of Three-Way Catalytic Converters Using Different Resonance Parameters—A Microwave Cavity Perturbation Study

机译：使用不同共振参数的三元催化转化器催化剂状态诊断 - 微波腔扰动研究

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Recently, radio frequency (RF) technology was introduced as a tool to determine the oxygen storage level of a three-way catalyst (TWC) for gasoline vehicles. Previous studies on the investigation of commercial catalysts mostly use only the resonant frequency to describe the correlation of oxygen storage level and RF signal. For the first time this study presents a comparison under defined laboratory conditions considering both, resonance frequency and also the quality factor as measurands. Furthermore, various advantages over the sole use of the resonant frequency in the technical application are discussed. Experiments with Ø4.66’’ catalysts and Ø1.66’’ catalyst cores with alternating (rich/lean) gas compositions showed that the relative change in signal amplitude due to a change in oxygen storage is about 100 times higher for the inverse quality factor compared to the resonant frequency. In addition, the quality factor reacts more sensitively to the onset of the oxygen-storage ability, and delivers precise information about the necessary temperature, which is not possible when evaluating the resonant frequency due to the low signal amplitude. As investigations on aged catalysts confirm, the quality factor also provides a new approach to determine operando the ageing state of a TWC.
机译：最近，引入射频（RF）技术作为确定汽油车辆的三元催化剂（TWC）的氧气储存水平的工具。以前关于商业催化剂的研究主要使用谐振频率来描述氧气储存水平和RF信号的相关性。本研究首次提出了在定义的实验室条件下的比较，考虑到两者，共振频率以及质量因数作为测量。此外，讨论了技术应用中唯一使用谐振频率的各种优点。具有交替（富含/稀）气体组合物的Ø4.66'''催化剂和Ø1.66'催化剂芯的实验表明，由于氧气储存变化导致的信号幅度的相对变化为逆质量因子的约100倍。与谐振频率相比。另外，质量因子更敏感地反应耗氧能力的开始，并且提供关于必要温度的精确信息，当由于低信号幅度而评估谐振频率时，这是不可能的。作为对老年催化剂的研究证实，质量因子还提供了一种确定Operando AGC的衰老状态的新方法。

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