原位FTIR在研究催化剂积炭失活中的应用

Application of In Situ FTIR to Deactivation by Coke Deposition

本文综述了原位傅立叶变换红外光谱(FTIR)法在研究石油化工催化反应中积炭现象的进展,介绍了运用原位FTIR在表征催化异构化反应、催化还原反应、催化裂解反应过程中催化剂积炭的结果,总结了对固体酸催化剂和双官能贵金属-酸催化剂上积炭形式的研究,讨论了不同温度下的积炭形成的过程。结合本课题组对正庚烷催化裂解反应的初步研究结果,提出原位FTIR的重点问题是峰的识别与归属,其应用可以拓展到更多催化反应的机理与催化剂性质的研究。

Advances on the application of in situ Fourier transform infrared （FTIR） spectrometry to coke deposition during catalytic processes of petrochemical industry, including catalytic isomerization, reduction, and cracking are reviewed in this paper. The mechanisms of coke deposition over solid acid catalysts and bi-functional noble metal acid catalysts are summarized. The causes of coke formation under different temperatures are also discussed. Based on the preliminary results of catalytic cracking of n-heptane over zeolites in our work, identification and assignment of IR absorption bands for coked substances as the key issues on application of in situ FTIR are put forward. Extended applications to the mechanisms of other catalytic reactions and the properties of catalysts are proposed.