Enhanced low temperature performance of bimetallic Pd/Pt/SiO2(core)@Zr(shell) diesel oxidation catalysts

Chih Han Liu; Stephen Porter; Junjie Chen; Hien Pham; Eric J. Peterson; Prateek Khatri; Todd J. Toops; Abhaya Datye; Eleni A. Kyriakidou

doi:10.1016/j.apcatb.2023.122436

Enhanced low temperature performance of bimetallic Pd/Pt/SiO₂(core)@Zr(shell) diesel oxidation catalysts

Chih Han Liu
, Stephen Porter
, Junjie Chen
, Hien Pham
, Eric J. Peterson
, Prateek Khatri
, Todd J. Toops
, Abhaya Datye
, Eleni A. Kyriakidou

Applied Catalysis&Emissions Res. Group

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

9 Scopus citations

Abstract

In this study, the diesel oxidation performance of degreened (DG) and hydrothermally aged monometallic and bimetallic Pd/Pt/SiO₂(core)@Zr(shell) catalysts with varying Pd/Pt molar ratios from 3/1–1/3 was evaluated. Pd/Pt(3/1)/SiO₂ @Zr (DG) achieved 50% and 90% conversion of CO at 166 °C (T₅₀), 169 °C (T₉₀) and total hydrocarbons (THCs) at 198 °C (T₅₀), 244 °C (T₉₀). Decreasing the Pd/Pt molar ratio led to a decrease in the T_50,90’s, with Pd/Pt(1/3)/SiO₂ @Zr (DG) achieving T_50,90’s at 153, 156 °C for CO and 171, 200 °C for THCs, respectively. Moreover, Pd/Pt(1/3)/SiO₂@Zr showed enhanced hydrothermal stability. XRD and TEM showed that in the hydrothermally aged bimetallic catalysts, the fraction of Pd present as a Pt-Pd metallic alloy increased with Pt content. The enhanced low temperature performance of Pd/Pt(1/3)/SiO₂@Zr compared to the other studied catalysts was attributed to Pd being primarily present in metallic form, despite being subjected to severe oxidizing conditions.

Original language	English
Article number	122436
Journal	Applied Catalysis B: Environmental
Volume	327
DOIs	https://doi.org/10.1016/j.apcatb.2023.122436
State	Published - Jun 15 2023

Funding

Financial support for the catalyst characterization via TEM was provided by the U.S. Department of Energy (DOE)/BES Catalysis Science program, grant DE-FG02-05ER15712 . Additional support was provided by the DOE Energy Efficiency and Renewable Energy ( EERE ), Vehicle Technologies Office ( DE-FOA-0002197 ). Acquisition of the TEM was supported by the NSF MRI grant DMR-1828731 .

Keywords

Core-shell support
Diesel oxidation catalyst
Hydrothermal stability
Pd/Pt alloy

Access to Document

10.1016/j.apcatb.2023.122436

Cite this

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title = "Enhanced low temperature performance of bimetallic Pd/Pt/SiO2(core)@Zr(shell) diesel oxidation catalysts",

abstract = "In this study, the diesel oxidation performance of degreened (DG) and hydrothermally aged monometallic and bimetallic Pd/Pt/SiO2(core)@Zr(shell) catalysts with varying Pd/Pt molar ratios from 3/1–1/3 was evaluated. Pd/Pt(3/1)/SiO2 @Zr (DG) achieved 50\% and 90\% conversion of CO at 166 °C (T50), 169 °C (T90) and total hydrocarbons (THCs) at 198 °C (T50), 244 °C (T90). Decreasing the Pd/Pt molar ratio led to a decrease in the T50,90{\textquoteright}s, with Pd/Pt(1/3)/SiO2 @Zr (DG) achieving T50,90{\textquoteright}s at 153, 156 °C for CO and 171, 200 °C for THCs, respectively. Moreover, Pd/Pt(1/3)/SiO2@Zr showed enhanced hydrothermal stability. XRD and TEM showed that in the hydrothermally aged bimetallic catalysts, the fraction of Pd present as a Pt-Pd metallic alloy increased with Pt content. The enhanced low temperature performance of Pd/Pt(1/3)/SiO2@Zr compared to the other studied catalysts was attributed to Pd being primarily present in metallic form, despite being subjected to severe oxidizing conditions.",

keywords = "Core-shell support, Diesel oxidation catalyst, Hydrothermal stability, Pd/Pt alloy",

author = "Liu, \{Chih Han\} and Stephen Porter and Junjie Chen and Hien Pham and Peterson, \{Eric J.\} and Prateek Khatri and Toops, \{Todd J.\} and Abhaya Datye and Kyriakidou, \{Eleni A.\}",

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year = "2023",

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doi = "10.1016/j.apcatb.2023.122436",

language = "English",

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T1 - Enhanced low temperature performance of bimetallic Pd/Pt/SiO2(core)@Zr(shell) diesel oxidation catalysts

AU - Liu, Chih Han

AU - Porter, Stephen

AU - Chen, Junjie

AU - Pham, Hien

AU - Peterson, Eric J.

AU - Khatri, Prateek

AU - Toops, Todd J.

AU - Datye, Abhaya

AU - Kyriakidou, Eleni A.

PY - 2023/6/15

Y1 - 2023/6/15

N2 - In this study, the diesel oxidation performance of degreened (DG) and hydrothermally aged monometallic and bimetallic Pd/Pt/SiO2(core)@Zr(shell) catalysts with varying Pd/Pt molar ratios from 3/1–1/3 was evaluated. Pd/Pt(3/1)/SiO2 @Zr (DG) achieved 50% and 90% conversion of CO at 166 °C (T50), 169 °C (T90) and total hydrocarbons (THCs) at 198 °C (T50), 244 °C (T90). Decreasing the Pd/Pt molar ratio led to a decrease in the T50,90’s, with Pd/Pt(1/3)/SiO2 @Zr (DG) achieving T50,90’s at 153, 156 °C for CO and 171, 200 °C for THCs, respectively. Moreover, Pd/Pt(1/3)/SiO2@Zr showed enhanced hydrothermal stability. XRD and TEM showed that in the hydrothermally aged bimetallic catalysts, the fraction of Pd present as a Pt-Pd metallic alloy increased with Pt content. The enhanced low temperature performance of Pd/Pt(1/3)/SiO2@Zr compared to the other studied catalysts was attributed to Pd being primarily present in metallic form, despite being subjected to severe oxidizing conditions.

AB - In this study, the diesel oxidation performance of degreened (DG) and hydrothermally aged monometallic and bimetallic Pd/Pt/SiO2(core)@Zr(shell) catalysts with varying Pd/Pt molar ratios from 3/1–1/3 was evaluated. Pd/Pt(3/1)/SiO2 @Zr (DG) achieved 50% and 90% conversion of CO at 166 °C (T50), 169 °C (T90) and total hydrocarbons (THCs) at 198 °C (T50), 244 °C (T90). Decreasing the Pd/Pt molar ratio led to a decrease in the T50,90’s, with Pd/Pt(1/3)/SiO2 @Zr (DG) achieving T50,90’s at 153, 156 °C for CO and 171, 200 °C for THCs, respectively. Moreover, Pd/Pt(1/3)/SiO2@Zr showed enhanced hydrothermal stability. XRD and TEM showed that in the hydrothermally aged bimetallic catalysts, the fraction of Pd present as a Pt-Pd metallic alloy increased with Pt content. The enhanced low temperature performance of Pd/Pt(1/3)/SiO2@Zr compared to the other studied catalysts was attributed to Pd being primarily present in metallic form, despite being subjected to severe oxidizing conditions.

KW - Core-shell support

KW - Diesel oxidation catalyst

KW - Hydrothermal stability

KW - Pd/Pt alloy

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