Corpus ID: 55902913

Analysis of the Gas Diffusivity in the Simulated Washcoat Layer Based on Mean Transport Pore Model and Mean Molecular Speed

@article{Kato2015AnalysisOT,
  title={Analysis of the Gas Diffusivity in the Simulated Washcoat Layer Based on Mean Transport Pore Model and Mean Molecular Speed},
  author={Satoru Kato and Hironobu Ozeki and Hiroshi Yamada and T. Tagawa and Naoki Takahashi and Hirofumi Shinjoh},
  journal={Chemical engineering transactions},
  year={2015},
  volume={43},
  pages={1591-1596}
}
The pore structure of a simulated washcoat layer was evaluated using the Mean Transport Pore Model (MTPM). The MTPM provides the mean diffusive pore radius (rm) of a simulated washcoat layer from the experimentally measured effective diffusion coefficient (De). However, data previously published in the literature indicated that the value of rm depended on the choice of diffusive gas for the measurement of De. Therefore, a new, more efficient method was developed to estimate rm. To obtain base… Expand
3 Citations

Figures from this paper

Analyzing Gas Transport Phenomena in Secondary Pore of Washcoat Layer Determined by X-ray Ct and Modeling
Washcoated catalysts on honeycomb substrates are widely used as automotive catalysts, and it is well known that their catalytic performance is limited by gas transport resistance. In order to reduceExpand
Characterization of secondary pores in washcoat layers and their effect on effective gas transport properties
Abstract It is well known that the performance of monolithic catalysts is limited by gas transport resistance in the washcoat layer. Gases are transported via two types of pores within the washcoatExpand
Investigation of gas diffusion phenomena in porous catalyst support pellets based on microstructure
Abstract Catalytic performance is influenced by the effective gas diffusivity in a heterogeneous catalyst. The diffusivity is dependent on the microstructure of the catalyst. Therefore, theExpand

References

SHOWING 1-7 OF 7 REFERENCES
Direct measurements of gas diffusivity in a washcoat layer under steady state conditions at ambient temperature
Abstract A method for directly measuring gas diffusivity in a washcoat layer was established by preparing a simulated washcoat layer and modifying a Wicke–Kallenbach type counter-current diffusionExpand
Evaluating the effective diffusivity of methane in the washcoat of a honeycomb monolith
Abstract The effective diffusion coefficient of methane in nitrogen is investigated in the washcoat of a honeycomb type monolith reactor. A flow cell operating at atmospheric pressure is used. TheExpand
Chromatographic determination of transport parameters of porous solids
Abstract Parameters of the mean transport pore model (MTPM) can be obtained by combining chromatographically determined effective diffusion coefficients for several gas pairs: (tracer gas)-(carrierExpand
Direct transport parameters measurement versus their estimation from mercury penetration in porous solids
Abstract It has become widespread practice to rely on mercury penetration data for the determination of pore-size distribution when calculating transport processes occurring in the porous structureExpand
Transport parameters of porous catalysts via chromatography with a single-pellet-string column
Abstract A method was developed for chromatographic determination of effective diffusion coefficients in porous solids which is suitable for cylindrical pellets. Pellets are stacked coaxially alongExpand
Development of a Kinetic Model of Lean-nox-trap and Validation Through a Reactive CFD Aprroach
Development of a Kinetic Model of Lean-NOx-Trap and Validation through a Reactive CFD Approach Michele Corbetta, Flavio Manenti, Carlo G. Visconti, Sauro Pierucci, Luca Lietti, Pio ForzattiExpand
washcoat of a honeycomb monolith, Applied Catalysis B: Environmental 25
  • 2013