A kinetic study of ammonia oxidation on a Pt catalyst in the explosive region in a microstructured reactor/heat-exchanger

Evgeny Rebrov, M.H.J.M. De Croon, J.C. Schouten

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28 Citations (Scopus)

Abstract

The application of an aluminum-based microstructured reactor/heat-exchanger for measuring reaction kinetics in the explosive region is presented. Platinum-catalyzed ammonia oxidation was chosen as a test reaction to demonstrate the feasibility of the method. The reaction kinetics was investigated in a wide range of conditions [NH3 partial pressure: 0.03-0.20 atm, O-2 partial pressure: 0.10-0.88atm; reactant flow 2000-3000 cm(3) min(-1) (STP); temperature 240-360degreesC] over a supported Pt/Al2O3 catalyst (mass of Al2O3 layer in the reactor, 1.95 mg; Pt/Al molar ratio, 0.71; Pt dispersion, 20%). The maximum temperature non-uniformity in the microstructured reactor was ca. 5degreesC, even at conditions corresponding to an adiabatic temperature rise of 1400degreesC. Based on the data obtained, a previous kinetic model for ammonia oxidation was extended. The modified 13-step model describes the data in a considerably wider range of conditions including those with high ammonia loadings and high reaction temperatures. The results indicate the large potential of microstructured devices as reliable tools for kinetic research of highly exothermic reactions.
Original languageEnglish
Pages (from-to)744-752
Number of pages9
JournalChemical Engineering Research and Design
Volume81
Issue number7
Publication statusPublished - Aug 2003

ASJC Scopus subject areas

  • Polymers and Plastics

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