4.8 Article

NOx adsorption with CO and C2H4 on Pd/SSZ-13: Experiments and modeling

期刊

APPLIED CATALYSIS B-ENVIRONMENTAL
卷 286, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.apcatb.2020.119871

关键词

Passive NOx adsorption; Pd; SSZ-13; Microkinetic modeling; Emission control

资金

  1. Department of Energy [DE-EE0008233]
  2. Office of Science, U.S. Department of Energy [DE-AC02-05CH11231]
  3. NSF [1531814]

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A transient monolith model is proposed to study NO uptake and release over Pd/SSZ-13, with or without reductants CO or C2H4. Kinetic parameters are estimated using a combination of DFT and experimental data fitting, which helps interpret data features and optimize operating conditions. The model shows higher NO uptake on Pd/SSZ-13 compared to Pd/ZSM-5.
A transient monolith model containing microkinetic schemes for NO uptake and release over Pd/SSZ-13 without and with reductants CO or C2H4 is presented. The scheme involves three cationic Pd species (Z(-)[PdOH](+), Z(-)[Pd(2+)Z(-), Z(-)Pd(+)) as the active sites during uptake of NO, CO and C2H4, and their desorption and conversion at higher temperature. Kinetic parameters are estimated through a combination of density functional theory (DFT) estimates and a fit of uptake, desorption and conversion data. The tuned model is validated at different uptake temperatures, ramp rates, and flowrates. A degree of uptake control parameter is defined that helps to identify the step(s) that are uptake controlling. The model helps to interpret the data features and is used to identify operating conditions to meet application-relevant performance metrics, including NO trapping efficiency and NO release temperature. The model demonstrates higher NO uptake on Pd/SSZ-13 compared to Pd/ZSM-5.

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