Real-time observation of the effect of oxygen storage materials on Pd-based three-way catalysts under ideal automobile exhaust conditions: an <i>operando</i> study
Real-time observation of the effect of oxygen storage materials on Pd-based three-way catalysts under ideal automobile exhaust conditions: an <i>operando</i> study
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理想汽车尾气条件下储氧材料对钯基三元催化剂效果的实时观察：一项<i>operando</i>研究
DOI：
10.1039/d1cy00460c
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Tanaka Tsunehiro
中科院分区：
文献类型：
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作者：
Asakura Hiroyuki;Hosokawa Saburo;Beppu Kosuke;Tamai Kazuki;Ohyama Junya;Shishido Tetsuya;Kato Kazuo;Teramura Kentaro;Tanaka Tsunehiro
采用微气相色谱仪、氮氧化物测定仪、四极杆质谱仪和时间分辨快速X射线吸收光谱（XAS）技术，对1wt%Pd/Al_2O_3和Pd/CeO_2催化剂的Pd物种和CeO_2载体在三效催化过程中的动态行为进行了真实的研究。与额外的非原位NO脉冲测量，结果表明，在理想的汽车尾气条件下的储氧材料的效果，这可以概括为一个众所周知的锚定效应的CeO 2上的活性金属物种，氧存储/释放效果，以保持近化学计量的条件下的催化剂表面，NO还原能力的CeO 2本身，和存储/释放的碳质物种上/从CeO 2。
The dynamic behavior of Pd species and the CeO2 support of 1 wt% Pd/Al2O3 and Pd/CeO2 catalysts during three-way catalysis was examined in real time with operando multi-probe analysis using a micro gas chromatograph, a NOx meter, and a quadrupole mass spectrometer and time-resolved quick X-ray absorption spectroscopy (XAS) measurements. With additional ex situ NO pulse measurement, the results demonstrated the effect of oxygen storage materials under ideal automobile exhaust conditions, which can be summarized into a well-known anchoring effect of CeO2 on active metal species, an oxygen storage/release effect to maintain near stoichiometric conditions on the catalyst surface, NO reduction ability of CeO2 itself, and storage/release of carbonaceous species on/from CeO2.