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Infrared spectroscopy detection technology |
| Publisher：Shanghai Jinghongkepu Optoelectronics Technology Co., Ltd Release time：2025-01-13 15:36:07 Click count：25 Close |
| In situ infrared spectroscopy characterization of high vacuum system is a specialized equipment used to determine the surface composition, adsorption, acidity, species, surface hydroxyl groups, and reaction mechanism of catalysts. It includes three parts: high vacuum system, gas distribution system, and high-temperature vacuum reaction tank. It can be used in conjunction with Fourier transform infrared spectrometer for chemical adsorption determination and reaction mechanism research of compounds such as ammonia, pyridine, carbon monoxide, nitric oxide, methanol, ethanol, etc. 1. Adsorption state research and catalyst infrared spectroscopy characterization Infrared spectroscopy has been widely used in the study of surface properties of catalysts, with the most effective and widely applied being the infrared spectroscopy of so-called "probe molecules" adsorbed on the catalyst surface, such as NO, CO, CO2, NH3, C3H5N, etc. Infrared spectroscopy characterization can provide information on the "active centers" and surface adsorbed species present on the catalyst surface, especially under in-situ reaction conditions. Therefore, it is very important for revealing the catalytic reaction mechanism. 1.1 Study on CO adsorption state CO has a high infrared extinction coefficient, and its unfilled empty orbitals easily interact with transition metals. At the same time, many important catalytic reactions such as carbonyl synthesis, water gas synthesis, Fischer Tropsch synthesis, etc. are closely related to CO. Therefore, studying the adsorption state of CO on transition metal surfaces is a very extensive research topic. 1.2 Determination of catalyst surface composition The difference between the surface composition and bulk composition of alloy catalysts can lead to significant differences in their performance. Therefore, determining the surface composition of catalysts is crucial for understanding the active sites involved in the reaction. By utilizing the competitive adsorption of two gas mixtures on the surface of two-component transition metal catalysts and measuring their intensity through infrared spectroscopy, the surface composition of bimetallic supported catalysts can be conveniently determined. A typical example is the infrared spectrum of CO and NO co adsorbed on Pt Ru bimetallic catalysts. |
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