An in situ spatially resolved analytical technique to simultaneously probe gas phase reactions and temperature within the packed bed of a plug flow reactor

Jamal Touitou, Robbie Burch, Christopher Hardacre*, Colin McManus, Kevin Morgan, Jacinto Sa, Alexandre Goguet

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Citations (Scopus)
259 Downloads (Pure)

Abstract

This paper reports the detailed description and validation of a fully automated, computer controlled analytical method to spatially probe the gas composition and thermal characteristics in packed bed systems. As an exemplar, we have examined a heterogeneously catalysed gas phase reaction within the bed of a powdered oxide supported metal catalyst. The design of the gas sampling and the temperature recording systems are disclosed. A stationary capillary with holes drilled in its wall and a moveable reactor coupled with a mass spectrometer are used to enable sampling and analysis. This method has been designed to limit the invasiveness of the probe on the reactor by using the smallest combination of thermocouple and capillary which can be employed practically. An 80 mu m (O.D.) thermocouple has been inserted in a 250 mu m (O.D.) capillary. The thermocouple is aligned with the sampling holes to enable both the gas composition and temperature profiles to be simultaneously measured at equivalent spatially resolved positions. This analysis technique has been validated by studying CO oxidation over a 1% Pt/Al2O3 catalyst and the spatial resolution profiles of chemical species concentrations and temperature as a function of the axial position within the catalyst bed are reported.

Original languageEnglish
Pages (from-to)2858-2862
Number of pages5
JournalAnalyst
Volume138
Issue number10
Early online date15 Mar 2013
DOIs
Publication statusPublished - 2013

Keywords

  • OXIDATION
  • CATALYST
  • PROFILES

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Electrochemistry
  • Biochemistry
  • Environmental Chemistry

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