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Title: 3D pore analysis of gasoline particulate filters using x-ray tomography: Impact of coating and ash-loading

Abstract

Since particulate emissions control technologies are dependent on filtration technologies, development of porous materials with optimized pore structures is crucial to improve filtration efficiency and pressure drop across filters. Despite increasing attention to 3D measurements of porous materials, there are few reports of pore structure investigations of diesel/gasoline particulate filters (D/GPFs) using 3D visualization techniques. In this work, GPF 3D pore structures were examined using X-ray tomography (XRT) to identify the impacts of catalyst coating or ash loading. Voxel resolution of 2.93 mu m made it impossible to distinguish coating or ash materials from the cordierite substrate or to recognize smaller pores than the voxel resolution. However, pores up to 200 mu m, which are responsible for the most pore volume, were successfully analyzed. Coating and ash loading resulted in lowering average pore diameter, total porosity, and open porosity, as the peak density of pore diameter at 60 mu m decreased, while pores below 20 mu m increased. Also, the visualized closed pores, which were homogeneously distributed throughout the bare filter, tended to get larger from inlet to outlet sides and more likely to be on the surface inlet due to coating and ash loading, indicating gas pathways originally existingmore » in open pores were blocked due to coating and ash loading, leading to increased pressure drop. The ash impact was found to be more noticeable on mid and back positions than on front position. In addition, the investigation of areal porosity along the direction of gas flow suggested that while ash penetration could reach the outlet side as noted from increased closed pore population, most ash particles would be contained up to 150 mu m. The 2D crosscut microscopic analysis that requires destructive procedures with the limited examination area could provide underestimation of ash penetration, whereas the 3D XRT analysis seems to provide more accurate information of pore structure changes due to ash loading at different locations.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technologies (VTO)
OSTI Identifier:
1510252
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Science
Additional Journal Information:
Journal Volume: 54; Journal Issue: 8
Country of Publication:
United States
Language:
English
Subject:
X-ray tomography; ash; gasoline particulate filter (GPF); pore structure

Citation Formats

Seong, Heeje, Choi, Seungmok, Matusik, Katarzyna E., Kastengren, Alan L., and Powell, Christopher F. 3D pore analysis of gasoline particulate filters using x-ray tomography: Impact of coating and ash-loading. United States: N. p., 2019. Web. doi:10.1007/s10853-018-03310-w.
Seong, Heeje, Choi, Seungmok, Matusik, Katarzyna E., Kastengren, Alan L., & Powell, Christopher F. 3D pore analysis of gasoline particulate filters using x-ray tomography: Impact of coating and ash-loading. United States. doi:10.1007/s10853-018-03310-w.
Seong, Heeje, Choi, Seungmok, Matusik, Katarzyna E., Kastengren, Alan L., and Powell, Christopher F. Mon . "3D pore analysis of gasoline particulate filters using x-ray tomography: Impact of coating and ash-loading". United States. doi:10.1007/s10853-018-03310-w.
@article{osti_1510252,
title = {3D pore analysis of gasoline particulate filters using x-ray tomography: Impact of coating and ash-loading},
author = {Seong, Heeje and Choi, Seungmok and Matusik, Katarzyna E. and Kastengren, Alan L. and Powell, Christopher F.},
abstractNote = {Since particulate emissions control technologies are dependent on filtration technologies, development of porous materials with optimized pore structures is crucial to improve filtration efficiency and pressure drop across filters. Despite increasing attention to 3D measurements of porous materials, there are few reports of pore structure investigations of diesel/gasoline particulate filters (D/GPFs) using 3D visualization techniques. In this work, GPF 3D pore structures were examined using X-ray tomography (XRT) to identify the impacts of catalyst coating or ash loading. Voxel resolution of 2.93 mu m made it impossible to distinguish coating or ash materials from the cordierite substrate or to recognize smaller pores than the voxel resolution. However, pores up to 200 mu m, which are responsible for the most pore volume, were successfully analyzed. Coating and ash loading resulted in lowering average pore diameter, total porosity, and open porosity, as the peak density of pore diameter at 60 mu m decreased, while pores below 20 mu m increased. Also, the visualized closed pores, which were homogeneously distributed throughout the bare filter, tended to get larger from inlet to outlet sides and more likely to be on the surface inlet due to coating and ash loading, indicating gas pathways originally existing in open pores were blocked due to coating and ash loading, leading to increased pressure drop. The ash impact was found to be more noticeable on mid and back positions than on front position. In addition, the investigation of areal porosity along the direction of gas flow suggested that while ash penetration could reach the outlet side as noted from increased closed pore population, most ash particles would be contained up to 150 mu m. The 2D crosscut microscopic analysis that requires destructive procedures with the limited examination area could provide underestimation of ash penetration, whereas the 3D XRT analysis seems to provide more accurate information of pore structure changes due to ash loading at different locations.},
doi = {10.1007/s10853-018-03310-w},
journal = {Journal of Materials Science},
number = 8,
volume = 54,
place = {United States},
year = {2019},
month = {4}
}

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This content will become publicly available on April 1, 2020
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