Multiscale reactor modelling of total pressure effects on complete methane oxidation over Pd/Al2O3
Artikel i vetenskaplig tidskrift, 2019

A two-dimensional multiscale model is developed for complete methane oxidation in a continuous flow reactor. The model considers mass and heat transfer for a porous alumina supported palladium catalyst coated on a ceramic monolith substrate and the surface kinetics are described by a first-principles microkinetic model for complete methane oxidation over PdO(101). The temperature dependent conversion for a synthetic exhaust gas composition shows a delayed ignition but a higher conversion at elevated temperatures when the total pressure is increased from 1 to 10 atm. The simulations reveal a temperature and total pressure dependent operating point where the methane conversion is maximized. Analysis of the kinetics shows that the reaction is suppressed by bicarbonates, hydroxyl species and water originating from adsorbed carbon dioxide and water from the gas phase. The reaction order with respect to water and carbon dioxide at 1 atm is -0.94 and -0.99, respectively, and decreases with increasing total pressure. The developed model paves the way for exploring how design parameters and reaction conditions influence the complete methane oxidation reaction.

Författare

Carl-Robert Florén

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Per-Anders Carlsson

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Per-Anders Carlsson Group

Derek Creaser

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk apparatteknik

Henrik Grönbeck

Chalmers, Fysik, Kemisk fysik

Magnus Skoglundh

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Catalysis Science and Technology

2044-4753 (ISSN) 2044-4761 (eISSN)

Vol. 9 12 3055-3065

Ämneskategorier

Kemiska processer

DOI

10.1039/c8cy02461h

Mer information

Senast uppdaterat

2019-10-02