Correlation of the ratio of metallic to oxide species with activity of PdPt catalysts for methane oxidation

Tang Son Nguyen, Miryam Arredondo-Arechavala, Paul McKeever, Yi-Chi Wang, Sarah Haigh, Andrew M. Beale, Jillian Thompson*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Activity of catalysts increase linearly with increasing ratio of Pd/Pt bimetallic to oxide species as observed in XRD. Bimetallic catalysts consisting of Pd and Pt on TiO 2 -zeolite (mordenite, beta, ZSM-5) supports were prepared and tested for the combustion of methane. The activity of the catalysts was found to be dependent on the zeolite topology and SiO 2 : Al 2 O 3 ratio and was linearly dependent on the proportion of Pd and Pt present in a bimetallic phase observed in XRD diffractograms of the catalysts. This linear dependence was valid for a range of zeolites used. STEM-EDS and electron tomography showed the Pd and Pt to be largely co-located and XAS and XPS indicated that the metals are mostly present in the form of oxide nanoparticles with a minor contribution from the metals at high SiO 2 : Al 2 O 3 ratios. Catalyst characterization showed there to be little difference overall in the metal loading and physical characteristics of the samples and NH 3 -TPD suggested that the activation of methane over acid sites is not important. Adding water to the feed, slightly reduced the conversion but did not affect the deactivation profile of the catalysts tested.
Original languageEnglish
JournalCatalysis, Science & technology
DOIs
Publication statusPublished - 2020

Fingerprint

Methane
Oxides
Zeolites
Oxidation
Catalysts
Metals
Temperature programmed desorption
Tomography
Energy dispersive spectroscopy
Catalyst activity
X ray photoelectron spectroscopy
Chemical activation
Topology
Nanoparticles
Acids
Electrons
Water

Cite this

@article{ae0aacaf2e904803ac14becbd7269508,
title = "Correlation of the ratio of metallic to oxide species with activity of PdPt catalysts for methane oxidation",
abstract = "Activity of catalysts increase linearly with increasing ratio of Pd/Pt bimetallic to oxide species as observed in XRD. Bimetallic catalysts consisting of Pd and Pt on TiO 2 -zeolite (mordenite, beta, ZSM-5) supports were prepared and tested for the combustion of methane. The activity of the catalysts was found to be dependent on the zeolite topology and SiO 2 : Al 2 O 3 ratio and was linearly dependent on the proportion of Pd and Pt present in a bimetallic phase observed in XRD diffractograms of the catalysts. This linear dependence was valid for a range of zeolites used. STEM-EDS and electron tomography showed the Pd and Pt to be largely co-located and XAS and XPS indicated that the metals are mostly present in the form of oxide nanoparticles with a minor contribution from the metals at high SiO 2 : Al 2 O 3 ratios. Catalyst characterization showed there to be little difference overall in the metal loading and physical characteristics of the samples and NH 3 -TPD suggested that the activation of methane over acid sites is not important. Adding water to the feed, slightly reduced the conversion but did not affect the deactivation profile of the catalysts tested.",
author = "Nguyen, {Tang Son} and Miryam Arredondo-Arechavala and Paul McKeever and Yi-Chi Wang and Sarah Haigh and Beale, {Andrew M.} and Jillian Thompson",
year = "2020",
doi = "10.1039/c9cy02371b",
language = "English",
journal = "CATALYSIS SCIENCE & TECHNOLOGY",
issn = "2044-4753",
publisher = "Royal Society of Chemistry",

}

Correlation of the ratio of metallic to oxide species with activity of PdPt catalysts for methane oxidation. / Nguyen, Tang Son; Arredondo-Arechavala, Miryam; McKeever, Paul; Wang, Yi-Chi; Haigh, Sarah; Beale, Andrew M.; Thompson, Jillian.

In: Catalysis, Science & technology, 2020.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Correlation of the ratio of metallic to oxide species with activity of PdPt catalysts for methane oxidation

AU - Nguyen, Tang Son

AU - Arredondo-Arechavala, Miryam

AU - McKeever, Paul

AU - Wang, Yi-Chi

AU - Haigh, Sarah

AU - Beale, Andrew M.

AU - Thompson, Jillian

PY - 2020

Y1 - 2020

N2 - Activity of catalysts increase linearly with increasing ratio of Pd/Pt bimetallic to oxide species as observed in XRD. Bimetallic catalysts consisting of Pd and Pt on TiO 2 -zeolite (mordenite, beta, ZSM-5) supports were prepared and tested for the combustion of methane. The activity of the catalysts was found to be dependent on the zeolite topology and SiO 2 : Al 2 O 3 ratio and was linearly dependent on the proportion of Pd and Pt present in a bimetallic phase observed in XRD diffractograms of the catalysts. This linear dependence was valid for a range of zeolites used. STEM-EDS and electron tomography showed the Pd and Pt to be largely co-located and XAS and XPS indicated that the metals are mostly present in the form of oxide nanoparticles with a minor contribution from the metals at high SiO 2 : Al 2 O 3 ratios. Catalyst characterization showed there to be little difference overall in the metal loading and physical characteristics of the samples and NH 3 -TPD suggested that the activation of methane over acid sites is not important. Adding water to the feed, slightly reduced the conversion but did not affect the deactivation profile of the catalysts tested.

AB - Activity of catalysts increase linearly with increasing ratio of Pd/Pt bimetallic to oxide species as observed in XRD. Bimetallic catalysts consisting of Pd and Pt on TiO 2 -zeolite (mordenite, beta, ZSM-5) supports were prepared and tested for the combustion of methane. The activity of the catalysts was found to be dependent on the zeolite topology and SiO 2 : Al 2 O 3 ratio and was linearly dependent on the proportion of Pd and Pt present in a bimetallic phase observed in XRD diffractograms of the catalysts. This linear dependence was valid for a range of zeolites used. STEM-EDS and electron tomography showed the Pd and Pt to be largely co-located and XAS and XPS indicated that the metals are mostly present in the form of oxide nanoparticles with a minor contribution from the metals at high SiO 2 : Al 2 O 3 ratios. Catalyst characterization showed there to be little difference overall in the metal loading and physical characteristics of the samples and NH 3 -TPD suggested that the activation of methane over acid sites is not important. Adding water to the feed, slightly reduced the conversion but did not affect the deactivation profile of the catalysts tested.

U2 - 10.1039/c9cy02371b

DO - 10.1039/c9cy02371b

M3 - Article

JO - CATALYSIS SCIENCE & TECHNOLOGY

JF - CATALYSIS SCIENCE & TECHNOLOGY

SN - 2044-4753

ER -