Modelling periodic NOx storage-reduction in presence of CO2

V.R. Gangwal; C.M.L. Scholz; M.H.J.M. Croon, de; J.C. Schouten

doi:10.1016/j.ces.2006.12.078

Modelling periodic NOx storage-reduction in presence of CO2

V.R. Gangwal
, C.M.L. Scholz
, M.H.J.M. Croon, de
, J.C. Schouten

Onderzoeksoutput: Bijdrage aan tijdschrift › Tijdschriftartikel › Academic › peer review

6 Citaten (Scopus)

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The influence of temperature on periodic NOx storage–reduction in the presence of CO2 has been investigated. A dynamic plug flow model and experiments performed in a packed bed reactor with a Pt–Ba/¿-Al2O3 powder catalyst (1 wt% Pt and 30 wt% Ba) with different lean/rich cycle timings at different temperatures are compared. The model is based on a multiple storage site mechanism. The rate of NOx storage increases with temperature. NOx storage below 300 °C mainly occurs through NO adsorption as nitrites. The oxidation of nitrites to nitrates by NO2, with release of NO, is the predominant storage step, and its rate increases with temperature. The number of sites taking part in NOx storage is independent of temperature and cycle time. The reduction of stored NOx with H2 is efficient. However, with an increase in temperature, thermal decomposition of nitrites/nitrates results in a decrease of NOx reduction

Originele taal-2	Engels
Pagina's (van-tot)	5167-5175
Tijdschrift	Chemical Engineering Science
Volume	62
Nummer van het tijdschrift	18-20
DOI's	https://doi.org/10.1016/j.ces.2006.12.078
Status	Gepubliceerd - 2007

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title = "Modelling periodic NOx storage-reduction in presence of CO2",

abstract = "The influence of temperature on periodic NOx storage–reduction in the presence of CO2 has been investigated. A dynamic plug flow model and experiments performed in a packed bed reactor with a Pt–Ba/¿-Al2O3 powder catalyst (1 wt\% Pt and 30 wt\% Ba) with different lean/rich cycle timings at different temperatures are compared. The model is based on a multiple storage site mechanism. The rate of NOx storage increases with temperature. NOx storage below 300 °C mainly occurs through NO adsorption as nitrites. The oxidation of nitrites to nitrates by NO2, with release of NO, is the predominant storage step, and its rate increases with temperature. The number of sites taking part in NOx storage is independent of temperature and cycle time. The reduction of stored NOx with H2 is efficient. However, with an increase in temperature, thermal decomposition of nitrites/nitrates results in a decrease of NOx reduction",

author = "V.R. Gangwal and C.M.L. Scholz and \{Croon, de\}, M.H.J.M. and J.C. Schouten",

year = "2007",

doi = "10.1016/j.ces.2006.12.078",

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T1 - Modelling periodic NOx storage-reduction in presence of CO2

AU - Gangwal, V.R.

AU - Scholz, C.M.L.

AU - Croon, de, M.H.J.M.

AU - Schouten, J.C.

PY - 2007

Y1 - 2007

N2 - The influence of temperature on periodic NOx storage–reduction in the presence of CO2 has been investigated. A dynamic plug flow model and experiments performed in a packed bed reactor with a Pt–Ba/¿-Al2O3 powder catalyst (1 wt% Pt and 30 wt% Ba) with different lean/rich cycle timings at different temperatures are compared. The model is based on a multiple storage site mechanism. The rate of NOx storage increases with temperature. NOx storage below 300 °C mainly occurs through NO adsorption as nitrites. The oxidation of nitrites to nitrates by NO2, with release of NO, is the predominant storage step, and its rate increases with temperature. The number of sites taking part in NOx storage is independent of temperature and cycle time. The reduction of stored NOx with H2 is efficient. However, with an increase in temperature, thermal decomposition of nitrites/nitrates results in a decrease of NOx reduction

AB - The influence of temperature on periodic NOx storage–reduction in the presence of CO2 has been investigated. A dynamic plug flow model and experiments performed in a packed bed reactor with a Pt–Ba/¿-Al2O3 powder catalyst (1 wt% Pt and 30 wt% Ba) with different lean/rich cycle timings at different temperatures are compared. The model is based on a multiple storage site mechanism. The rate of NOx storage increases with temperature. NOx storage below 300 °C mainly occurs through NO adsorption as nitrites. The oxidation of nitrites to nitrates by NO2, with release of NO, is the predominant storage step, and its rate increases with temperature. The number of sites taking part in NOx storage is independent of temperature and cycle time. The reduction of stored NOx with H2 is efficient. However, with an increase in temperature, thermal decomposition of nitrites/nitrates results in a decrease of NOx reduction

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DO - 10.1016/j.ces.2006.12.078

M3 - Article

SN - 0009-2509

VL - 62

SP - 5167

EP - 5175

JO - Chemical Engineering Science

JF - Chemical Engineering Science

IS - 18-20

ER -

Modelling periodic NOx storage-reduction in presence of CO2

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