Improved Hydrothermal Stability in Glass Diesel Soot Oxidation Catalysts
The hydrothermal stability of K-Ca-Si-O glass soot oxidation catalysts has been improved by substitution of Ce and Zr for Ca. This work demonstrates that glasses can be tailored to withstand the challenging diesel exhaust hydrothermal environment by considering the field strengths and partial molar...
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doaj-28acfcdb041d4a62901e529b9fcb45b62020-11-25T01:17:11ZengMDPI AGCatalysts2073-43442019-08-019868410.3390/catal9080684catal9080684Improved Hydrothermal Stability in Glass Diesel Soot Oxidation CatalystsJames Zokoe0Xiaoxiang Feng1Changsheng Su2Paul J. McGinn3Cummins Inc., 1900 McKinley Ave., Columbus, IN 47201, USADepartment of Chemical and Biomolecular Engineering; University of Notre Dame, Notre Dame, IN 46556, USACummins Inc., 1900 McKinley Ave., Columbus, IN 47201, USADepartment of Chemical and Biomolecular Engineering; University of Notre Dame, Notre Dame, IN 46556, USAThe hydrothermal stability of K-Ca-Si-O glass soot oxidation catalysts has been improved by substitution of Ce and Zr for Ca. This work demonstrates that glasses can be tailored to withstand the challenging diesel exhaust hydrothermal environment by considering the field strengths and partial molar free energies of the hydration reactions (ΔG<sub>i</sub>) of the cation species in the glass. The result is a glass that shows less formation of precipitates after 2 h hydrothermal exposure in air with 7% H<sub>2</sub>O at temperatures ranging from 300−700 °C. A K-Ca-Si-O glass with a soot T<sub>50</sub> (the temperature when 50% of the soot is oxidized) of 394 °C was found to degrade to 468 °C after a 2 h, 700 °C hydrothermal exposure, whereas the improved K-Ce-Zr-Si-O glass only changed from 407 °C to 427 °C after the same treatment.https://www.mdpi.com/2073-4344/9/8/684soot oxidationpotassium catalystglass catalystdiesel particulate filterglass weatheringglass corrosion |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
James Zokoe Xiaoxiang Feng Changsheng Su Paul J. McGinn |
spellingShingle |
James Zokoe Xiaoxiang Feng Changsheng Su Paul J. McGinn Improved Hydrothermal Stability in Glass Diesel Soot Oxidation Catalysts Catalysts soot oxidation potassium catalyst glass catalyst diesel particulate filter glass weathering glass corrosion |
author_facet |
James Zokoe Xiaoxiang Feng Changsheng Su Paul J. McGinn |
author_sort |
James Zokoe |
title |
Improved Hydrothermal Stability in Glass Diesel Soot Oxidation Catalysts |
title_short |
Improved Hydrothermal Stability in Glass Diesel Soot Oxidation Catalysts |
title_full |
Improved Hydrothermal Stability in Glass Diesel Soot Oxidation Catalysts |
title_fullStr |
Improved Hydrothermal Stability in Glass Diesel Soot Oxidation Catalysts |
title_full_unstemmed |
Improved Hydrothermal Stability in Glass Diesel Soot Oxidation Catalysts |
title_sort |
improved hydrothermal stability in glass diesel soot oxidation catalysts |
publisher |
MDPI AG |
series |
Catalysts |
issn |
2073-4344 |
publishDate |
2019-08-01 |
description |
The hydrothermal stability of K-Ca-Si-O glass soot oxidation catalysts has been improved by substitution of Ce and Zr for Ca. This work demonstrates that glasses can be tailored to withstand the challenging diesel exhaust hydrothermal environment by considering the field strengths and partial molar free energies of the hydration reactions (ΔG<sub>i</sub>) of the cation species in the glass. The result is a glass that shows less formation of precipitates after 2 h hydrothermal exposure in air with 7% H<sub>2</sub>O at temperatures ranging from 300−700 °C. A K-Ca-Si-O glass with a soot T<sub>50</sub> (the temperature when 50% of the soot is oxidized) of 394 °C was found to degrade to 468 °C after a 2 h, 700 °C hydrothermal exposure, whereas the improved K-Ce-Zr-Si-O glass only changed from 407 °C to 427 °C after the same treatment. |
topic |
soot oxidation potassium catalyst glass catalyst diesel particulate filter glass weathering glass corrosion |
url |
https://www.mdpi.com/2073-4344/9/8/684 |
work_keys_str_mv |
AT jameszokoe improvedhydrothermalstabilityinglassdieselsootoxidationcatalysts AT xiaoxiangfeng improvedhydrothermalstabilityinglassdieselsootoxidationcatalysts AT changshengsu improvedhydrothermalstabilityinglassdieselsootoxidationcatalysts AT pauljmcginn improvedhydrothermalstabilityinglassdieselsootoxidationcatalysts |
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1725147619994370048 |