Telegeiev Igor, Thili Oumaima, Lanel Adrien, Bazin Philippe, Levaque Yoann, Fernandez Christian, El-Roz Mohamad
Normandie University , Ensicaen, Unicaen, CNRS, Laboratoire Catalyse et Spectrochimie , 14000 Caen , France.
Anal Chem. 2018 Dec 18;90(24):14586-14592. doi: 10.1021/acs.analchem.8b04754. Epub 2018 Nov 30.
Various catalytic and photocatalytic reactions in the liquid phase give rise to gas products. Therefore, the identification and quantification of these products are of high importance and are even essential for some reactions. In this paper, a new in situ FTIR reactor is designed and used for analyzing the gas headspace of a (photo)catalytic reaction in solution. It allows the identification and quantification of the gas-phase products of a liquid reaction under operating conditions and in real time. The new reactor has been tested in three representative photocatalytic reactions widely studied as model reactions in the liquid phase: i.e., (i) decomposition of formic acid, (ii) oxidation of methylene blue, and (iii) reduction of CO. The validity of the results has been confirmed by analyzing the headspace at the end of the reaction using gas chromatography technique. The new reactor opens the possibility to follow online the (photo)catalyst activity. This is useful for ensuring the stability of the catalyst and studying the evolution of the selectivity during the reaction. The nondestructive behavior of the FTIR technique allows its coupling with other techniques for obtaining complementary results. The new reactor setup is easy to handle and to ship and is very efficient, which makes it very suitable for performing complementary, fast and/or preliminary studies.
液相中的各种催化和光催化反应会产生气体产物。因此，对这些产物的鉴定和定量非常重要，甚至对某些反应来说是必不可少的。本文设计了一种新型原位傅里叶变换红外光谱（FTIR）反应器，并将其用于分析溶液中（光）催化反应的气体顶空。它能够在操作条件下实时鉴定和定量液体反应的气相产物。该新型反应器已在作为液相模型反应广泛研究的三个代表性光催化反应中进行了测试：即（i）甲酸分解，（ii）亚甲基蓝氧化，以及（iii）CO还原。通过使用气相色谱技术分析反应结束时的顶空，证实了结果的有效性。这种新型反应器为在线跟踪（光）催化剂活性提供了可能性。这对于确保催化剂的稳定性以及研究反应过程中选择性的演变很有用。FTIR技术的无损特性使其能够与其他技术联用，以获得互补的结果。这种新型反应器装置易于操作和运输，而且效率很高，这使其非常适合进行互补、快速和/或初步研究。
