The status quo and prospect of ESR imaging applications to study on catalysts
The status quo and prospect of ESR imaging applications to study on catalysts
复制标题
ESR成像在催化剂研究中的应用现状与展望
DOI：
10.1007/bf03161992
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发表时间：
1997
影响因子：
1
通讯作者：
Y. Xu
中科院分区：
文献类型：
--
作者：
Z. Xiang;Y. Xu
ESR成像技术为自旋物种的空间成像提供了可能性，并已被广泛接受为许多领域的有用工具。电子自旋共振成像可用于观察自旋物种的空间分布并确定扩散过程。这些应用必将引起催化领域化学家的兴趣。本文论述了ESR成像技术的特点和局限性，以及ESR成像技术在催化剂研究中的应用现状和前景。在现有的ESR装置上，灵敏度和空间分辨率足以满足催化剂研究中的大多数应用。虽然这方面的工作报道不多，但其前景将是令人感兴趣的。本文用ESR成像技术对催化剂体系中顺磁物质（反应物、产物和中间体）的空间分布进行了原位观测，并对催化剂颗粒中的扩散进行了测定，对微型固定床反应器中的中毒进行了表征。这种方法不仅可以直接研究顺磁粒子，而且可以间接研究淬灭自旋信号的反磁粒子。
ESR imaging technique supplies us with the possibility of spatial imaging of spin species, and has been widely accepted as a useful tool in many fields. ESR imaging can be applied to observing the spatial distribution of spin species and determining the diffusion processes. These applications will certainly interest chemists in catalyst field. In this paper, the characteristics and limitations of ESR imaging technique, and the status quo and prospect, of ESR imaging applications to catalyst study are discussed. With a current ESR apparatus, the sensitivity and spatial resolution are good enough for the most applications in catalyst studies. Although few works in this field have been reported, its prospect will be interesting. We suggestin situ observation of spatial distribution of paramagnetic species (such as reactants, products and intermediates) in a catalyst system, determination of diffusion in a catalyst pellet and characterization of poisoning in micro fixed-bed reactors with ESR imaging method. Not only paramagnetic species could be studied directly, but also antimagnetic species, which quench spin signals, could be studied indirectly with this method.