A transmission infrared cell design for temperature-controlled adsorption and reactivity studies on heterogeneous catalysts

A design is presented for a versatile transmission infraredcell that can interface with an external vacuummanifold to undergoin situ gas treatments and receive controlled doses of various adsorbates and probe molecules, allowing characterization of heterogeneous catalyst surfaces in order to identify and quantify active sites and adsorbed surface species. Critical design characteristics include customized temperature control for operation betweencryogenic and elevated temperatures (100 –1000 K) and modified Cajon fittings for operation over a wide pressure range (10−2–103 Torr) that eliminates the complications introduced when using sealants or flanges to securecell windows. The customized, hand-tightened Cajon fittings simplify operation of thecell compared to previously reported designs, because they allow for rapidcell assembly and disassembly and, in turn, replacement of catalyst samples. In order to validate the performance of thecell, transmission infrared spectroscopic experiments are reported to characterize the Br ønsted and Lewisacid sites present in H-beta and H-mordenitezeolites usingcryogenicadsorption of CO (

Source: Review of Scientific Instruments - October 3, 2016 Category: Physics Authors: Viktor J. Cybulskis, James W. Harris, Yury Zvinevich, Fabio H. Ribeiro and Rajamani Gounder Source Type: research