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

A design is presented for a versatile transmission infrared cell that can interface with an external vacuum manifold to undergo in situ gas treatments and receive controlled doses of various adsorbates and probe molecules, allowing characterization of heterogeneous catalyst surfaces in order to iden...

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Bibliographic Details
Published in:Review of scientific instruments 2016-10, Vol.87 (10), p.103101-103101
Main Authors: Cybulskis, Viktor J., Harris, James W., Zvinevich, Yury, Ribeiro, Fabio H., Gounder, Rajamani
Format: Article
Language:English
Subjects:
Adsorbates
Adsorption
Catalysis
Catalysts
Cryogenic temperature
Dismantling
Fittings
Flanges
High temperature
Lewis acid
Scientific apparatus & instruments
Sealants
Surface chemistry
Temperature control
Zeolites
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Summary:A design is presented for a versatile transmission infrared cell that can interface with an external vacuum manifold to undergo in 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 between cryogenic 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 secure cell windows. The customized, hand-tightened Cajon fittings simplify operation of the cell compared to previously reported designs, because they allow for rapid cell assembly and disassembly and, in turn, replacement of catalyst samples. In order to validate the performance of the cell, transmission infrared spectroscopic experiments are reported to characterize the Brønsted and Lewis acid sites present in H-beta and H-mordenite zeolites using cryogenic adsorption of CO (
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4963665