A modified commercial DRIFTS cell for kinetically relevant operando studies of heterogeneous catalytic reactions

Frederic Meunier, Alexandre Goguet, Sergiy Shekhtman, David Rooney, Helen Daly

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

This paper discusses a number of checks that should be carried out to ensure that the kinetic and spectroscopic measurements made using a DRIFTS cell are meaningful. The observations reported here demonstrate how an appropriately modified commercial DRIFTS cell can provide pertinent kinetic information about both gaseous products and the related surface intermediates. The oxidation of CO with 02 was used as a test to assess the catalyst bed bypass by the reaction mixture. Full CO conversion was obtained after the light-off temperature in the case of the modified cell, contrary to the case of the original cell, for which 80% of the reaction mixture bypassed the catalyst bed. The water-gas shift reaction over a Pt/CeO2 catalyst was used as a model reaction to further characterize the behavior of the cell under reaction conditions. The catalyst bed was shown not to be a dead-zone and was purged in essentially the same time as that needed to purge the cell. The reaction chamber globally operated in a quasi plug-flow mode and the gas composition in the thin catalyst bed appears to be homogeneous when operated under differential conditions. The production of the gas-phase reaction product CO2 could be simultaneously followed both by mass spectrometry and DRIFTS, both techniques leading to identical results. Various IR bands integration methods were discussed to allow a precise and accurate determination of the surface concentration of adsorbates during isotopic exchange. (c) 2008 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)196-202
Number of pages7
JournalAPPLIED CATALYSIS A-GENERAL
Volume340 (2)
Issue number2
DOIs
Publication statusPublished - 01 Jun 2008

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Fingerprint Dive into the research topics of 'A modified commercial DRIFTS cell for kinetically relevant operando studies of heterogeneous catalytic reactions'. Together they form a unique fingerprint.

  • Cite this