Improving NOx storage and CO oxidation abilities of Pd/SSZ-13 by increasing its hydrophobicity

Jaeha Lee; Jonghyun Kim; Yongwoo Kim; Sungha Hwang; Hyokyoung Lee; Chang Hwan Kim; Do Heui Kim

doi:10.1016/j.apcatb.2020.119190

Improving NO_x storage and CO oxidation abilities of Pd/SSZ-13 by increasing its hydrophobicity

Jaeha Lee, Jonghyun Kim, Yongwoo Kim, Sungha Hwang, Hyokyoung Lee, Chang Hwan Kim, Do Heui Kim

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

52 Scopus citations

Abstract

When Pd is atomically dispersed in hydrophilic SSZ-13, it is readily hydrated to form Pd-hydrate ions. The formation of Pd-hydrate ions from dehydrated Pd ions has been reported to greatly hamper the NO_x storage capacity. In this study, the concentration of dehydrated Pd ions in Pd/SSZ-13 was increased by making the sample more hydrophobic. Hydrophobic Pd/SSZ-13 was synthesized by inducing dealumination in hydrophilic Pd/SSZ-13 through the hydrothermal treatment at 750 °C, while the atomic dispersion of Pd was confirmed in both hydrophilic and hydrophobic Pd/SSZ-13 samples. Hydrophobic Pd/SSZ-13 displayed the improved NO_x storage capacity in the desirable NO_x desorption temperature range and the enhanced rate of NO_x adsorption than hydrophilic Pd/SSZ-13. Hydrophobic Pd/SSZ-13 also displayed the better CO oxidation ability (shifting the temperature of 50 % CO conversion to the lower temperature by 71 °C) than hydrophilic Pd/SSZ-13. These improvements would have the important implications in developing Passive NO_x Adsorbers.

Original language	English
Article number	119190
Journal	Applied Catalysis B: Environmental
Volume	277
DOIs	https://doi.org/10.1016/j.apcatb.2020.119190
State	Published - 15 Nov 2020

Keywords

CO oxidation
Hydrophobicity
Passive NO adsorber
Pd-hydrate ion
SSZ-13

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10.1016/j.apcatb.2020.119190

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title = "Improving NOx storage and CO oxidation abilities of Pd/SSZ-13 by increasing its hydrophobicity",

abstract = "When Pd is atomically dispersed in hydrophilic SSZ-13, it is readily hydrated to form Pd-hydrate ions. The formation of Pd-hydrate ions from dehydrated Pd ions has been reported to greatly hamper the NOx storage capacity. In this study, the concentration of dehydrated Pd ions in Pd/SSZ-13 was increased by making the sample more hydrophobic. Hydrophobic Pd/SSZ-13 was synthesized by inducing dealumination in hydrophilic Pd/SSZ-13 through the hydrothermal treatment at 750 °C, while the atomic dispersion of Pd was confirmed in both hydrophilic and hydrophobic Pd/SSZ-13 samples. Hydrophobic Pd/SSZ-13 displayed the improved NOx storage capacity in the desirable NOx desorption temperature range and the enhanced rate of NOx adsorption than hydrophilic Pd/SSZ-13. Hydrophobic Pd/SSZ-13 also displayed the better CO oxidation ability (shifting the temperature of 50 % CO conversion to the lower temperature by 71 °C) than hydrophilic Pd/SSZ-13. These improvements would have the important implications in developing Passive NOx Adsorbers.",

keywords = "CO oxidation, Hydrophobicity, Passive NO adsorber, Pd-hydrate ion, SSZ-13",

author = "Jaeha Lee and Jonghyun Kim and Yongwoo Kim and Sungha Hwang and Hyokyoung Lee and Kim, {Chang Hwan} and Kim, {Do Heui}",

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year = "2020",

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doi = "10.1016/j.apcatb.2020.119190",

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T1 - Improving NOx storage and CO oxidation abilities of Pd/SSZ-13 by increasing its hydrophobicity

AU - Lee, Jaeha

AU - Kim, Jonghyun

AU - Kim, Yongwoo

AU - Hwang, Sungha

AU - Lee, Hyokyoung

AU - Kim, Chang Hwan

AU - Kim, Do Heui

PY - 2020/11/15

Y1 - 2020/11/15

N2 - When Pd is atomically dispersed in hydrophilic SSZ-13, it is readily hydrated to form Pd-hydrate ions. The formation of Pd-hydrate ions from dehydrated Pd ions has been reported to greatly hamper the NOx storage capacity. In this study, the concentration of dehydrated Pd ions in Pd/SSZ-13 was increased by making the sample more hydrophobic. Hydrophobic Pd/SSZ-13 was synthesized by inducing dealumination in hydrophilic Pd/SSZ-13 through the hydrothermal treatment at 750 °C, while the atomic dispersion of Pd was confirmed in both hydrophilic and hydrophobic Pd/SSZ-13 samples. Hydrophobic Pd/SSZ-13 displayed the improved NOx storage capacity in the desirable NOx desorption temperature range and the enhanced rate of NOx adsorption than hydrophilic Pd/SSZ-13. Hydrophobic Pd/SSZ-13 also displayed the better CO oxidation ability (shifting the temperature of 50 % CO conversion to the lower temperature by 71 °C) than hydrophilic Pd/SSZ-13. These improvements would have the important implications in developing Passive NOx Adsorbers.

AB - When Pd is atomically dispersed in hydrophilic SSZ-13, it is readily hydrated to form Pd-hydrate ions. The formation of Pd-hydrate ions from dehydrated Pd ions has been reported to greatly hamper the NOx storage capacity. In this study, the concentration of dehydrated Pd ions in Pd/SSZ-13 was increased by making the sample more hydrophobic. Hydrophobic Pd/SSZ-13 was synthesized by inducing dealumination in hydrophilic Pd/SSZ-13 through the hydrothermal treatment at 750 °C, while the atomic dispersion of Pd was confirmed in both hydrophilic and hydrophobic Pd/SSZ-13 samples. Hydrophobic Pd/SSZ-13 displayed the improved NOx storage capacity in the desirable NOx desorption temperature range and the enhanced rate of NOx adsorption than hydrophilic Pd/SSZ-13. Hydrophobic Pd/SSZ-13 also displayed the better CO oxidation ability (shifting the temperature of 50 % CO conversion to the lower temperature by 71 °C) than hydrophilic Pd/SSZ-13. These improvements would have the important implications in developing Passive NOx Adsorbers.

KW - CO oxidation

KW - Hydrophobicity

KW - Passive NO adsorber

KW - Pd-hydrate ion

KW - SSZ-13

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U2 - 10.1016/j.apcatb.2020.119190

DO - 10.1016/j.apcatb.2020.119190

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JO - Applied Catalysis B: Environmental

JF - Applied Catalysis B: Environmental

M1 - 119190

ER -

Improving NO_x storage and CO oxidation abilities of Pd/SSZ-13 by increasing its hydrophobicity

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