MEASUREMENT OF EFFECTIVE DIFFUSIVITY IN CATALYST-COATED MONOLITH BY CHROMATOGRAPHIC METHOD
Result description
The effective diffusivity in the pores of catalytic monolith was studied in single pellet-string columns (SPSC) by chromatographic technique (carrier-gas: N2; tracer-gases: He, Ar). The column was packed with small monolith particles (slab geometry). Dispersion due to extra column effects was eliminated via convolution of responses for two column lengths. The measurements were done for both cordierite support and cordierite support with alumina based washcoat. The effective diffusion coefficients for two tracer-carrier pairs were evaluated by fitting column response (chromatographic) peaks in time domain. Mean transport parameters were evaluated for both types of porous particles. Obtained mean transport pore radii are in reasonable agreement with poresize distribution from mercury porosimetry.
Keywords
Catalyst monolithDiffusionMass transferSingle pellet-string column (SPSC)Transport processesChromatographic method
The result's identifiers
Result code in IS VaVaI
Alternative codes found
RIV/60461373:22340/05:00015447
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
MEASUREMENT OF EFFECTIVE DIFFUSIVITY IN CATALYST-COATED MONOLITH BY CHROMATOGRAPHIC METHOD
Original language description
The effective diffusivity in the pores of catalytic monolith was studied in single pellet-string columns (SPSC) by chromatographic technique (carrier-gas: N2; tracer-gases: He, Ar). The column was packed with small monolith particles (slab geometry). Dispersion due to extra column effects was eliminated via convolution of responses for two column lengths. The measurements were done for both cordierite support and cordierite support with alumina based washcoat. The effective diffusion coefficients for two tracer-carrier pairs were evaluated by fitting column response (chromatographic) peaks in time domain. Mean transport parameters were evaluated for both types of porous particles. Obtained mean transport pore radii are in reasonable agreement with poresize distribution from mercury porosimetry.
Czech name
MEASUREMENT OF EFFECTIVE DIFFUSIVITY IN CATALYST-COATED MONOLITH BY CHROMATOGRAPHIC METHOD
Czech description
Byly studovány efektivní difúzní koeficienty pomocí chromatografické metody v SPSC koloně (nosný plyn: N2; stopovací plyny: He, Ar). Kolona byla naplněna kousky monolitu. Disperze signálu způsobená vedlejšími efekty byla odstraněna pomocí konvoluce odezvy pro 2 délky kolony. Měření byla provedena jak pro samotný keramický nosič, tak pro nosič pokrytý katalytickou vrstvou. Efektivní difúzní koeficienty pro dva páry nosný plyn - stopovací látka byly získány pomocí optimalizace parametrů elučních píků v časové doméně. Střední transportní parametry byly vyčísleny pro oba typy částic. Obdržené střední hodnoty poloměrů transportních pórů jsou v dobré shodě s distribucí poloměrů pórů získanými pomocí rtuťové porosimetre.
Classification
Type
O - Miscellaneous
CEP classification
CI - Industrial chemistry and chemical engineering
OECD FORD branch
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Result continuities
Project
GA104/05/2616: Catalytic reactors for combustion of exhaust gases of automobiles
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2005
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Basic information
Result type
O - Miscellaneous
CEP
CI - Industrial chemistry and chemical engineering
Year of implementation
2005