title: Ultraviolet-Visible (UV-Vis) Microspectroscopic System Designed for the In Situ Characterization of the Dehydrogenation Reaction Over Platinum Supported Catalytic Microchannel Reactor.
abstract: An ultraviolet visible (UV-Vis) microspectroscopic system was designed for the in situ characterization of the activity of the silica supported platinum (Pt) catalyst toward the dehydrogenation of 1-methyl-1,4-cyclohexadiene carried out in a custom-designed catalytic microreactor cell. The in situ catalytic microreactor cell (ICMC) with inlet/outlet ports was prepared using quartz cover as the optical window to facilitate UV-Vis observation. A fabricated thermometric stage was adapted to the UV-Vis microspectrophotometer to control the reaction temperature inside the ICMC. The spectra were collected by focusing the UV-Vis beam on a 30 × 30 µm area at the center of ICMC. At 393 K, the sequential measurement of the spectra recorded during the reaction exhibited a broad absorption peak with maximum absorbance at 260 nm that is characteristic for gaseous toluene. This result indicates that the silica supported Pt catalyst is active towards the dehydrogenation of 1-methyl-1,4-cyclohexadiene at the given experimental conditions. The onset of coke formation was also detected based on the appearance of absorption bands at 300 nm. The UV-Vis microspectroscopic system developed can be used further in studying the mechanism of the dehydrogenation reaction.
authors.affiliation: Department of Chemical Engineering, Nagoya University, Chikusa, Nagoya, Japan egtsuarnaba@yahoo.com.
authors.forename: Emee Grace Tabares
authors.initials: EG
authors.lastname: Suarnaba
authors.affiliation: Department of Chemical Engineering, Nagoya University, Chikusa, Nagoya, Japan.
authors.forename: Yi Fuan
authors.initials: YF
authors.lastname: Lee
authors.affiliation: Department of Chemical Engineering, Nagoya University, Chikusa, Nagoya, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yamada
authors.affiliation: Department of Chemical Engineering, Nagoya University, Chikusa, Nagoya, Japan.
authors.forename: Tomohiko
authors.initials: T
authors.lastname: Tagawa
keywords: UV-Vis; Ultraviolet-visible microspectroscopy; dehydrogenation reaction; in situ; oxide-supported; platinum catalyst