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Experimental and density functional theory studies on Cu/Ba-coimpregnated γ-Al2O3 for low-temperature NO storage and adsorbent regeneration

Title
Experimental and density functional theory studies on Cu/Ba-coimpregnated γ-Al2O3 for low-temperature NO storage and adsorbent regeneration
Authors
Kim, HyunwookHYEONJUNG, JUNGHYEONJUNGHAN, JEONG WOOLee, Ki Bong
Date Issued
2022-02
Publisher
Elsevier BV
Abstract
Although the lean-NOx trap (LNT) has been used to reduce NOx emissions from diesel-powered vehicles, LNT application is limited because its performance degrades at low temperatures (e.g., during cold starting). Therefore, to enhance low-temperature NOx storage and adsorbent regeneration, γ-Al2O3 was coimpregnated with both Cu and Ba (Cu–Ba/γ-Al2O3). The experimentally measured NOx storage capacities (NSCs) and NOx storage efficiencies (NSEs) were compared. Density-functional-theory (DFT) calculations were performed to reveal the NOx storage mechanism. The Cu/Ba-coimpregnated γ-Al2O3 improved both NSC and NSE of NO storage and enhanced NSE of NO2 storage at initial stage. In addition, it desorbed NOx at lower temperatures than the conventional Ba-impregnated γ-Al2O3 (Ba/γ-Al2O3). The in-situ diffuse reflectance infrared Fourier-transform spectroscopy analysis and DFT calculations for NO storage showed that NO adsorption was superior on the Cu-compound surfaces and that stable hyponitrite was stored on the Ba-compound surfaces. In NO2 storage, Cu/Ba coimpregnation offered high preferential NO2 coverage on the CuO surface and produced the most stable ionic nitrate on the Ba-compound surfaces. The experimental and theoretical results confirmed that the Cu/Ba-coimpregnated adsorbent exhibited both superior NOx storage and adsorbent regeneration compared to the conventional Ba-containing LNT adsorbent.
URI
https://oasis.postech.ac.kr/handle/2014.oak/107563
DOI
10.1016/j.cej.2021.132112
ISSN
1385-8947
Article Type
Article
Citation
Chemical Engineering Journal, vol. 429, 2022-02
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한정우HAN, JEONG WOO
Dept. of Chemical Enginrg
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