Role of ZnO and CeOx in Cu-Based model catalysts in activation of h2O and CO2 dynamics studied by in situ ultraviolet−Visible and x‑ray photoelectron spectroscopy

Yibin Bu, C.J. Weststrate, J.W. Niemantsverdriet, Hans O.A. Fredriksson

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)

Abstract

Flat model and powder Cu, ZnO/Cu, and CeOx/Cu catalysts were studied by focusing on the role of the oxide phase as a promoter in the water gas shift (WGS) and its reverse reaction (RWGS). Activity measurements of the powder catalysts showed that both oxides enhance Cu reactivity, with CeOx/Cu being more active than ZnO/Cu in the WGS reaction. In situ ultraviolet−visible spectroscopy, exploiting the localized surface plasmon resonances of metallic Cu nanoparticles, together with X-ray photoelectron spectroscopy was then used to elucidate the origin of the enhanced reactivity on flat model catalysts. These experiments showed that ZnO and CeOx promote H2O and CO2 dissociation, leading to oxidation of the Cu nanoparticles. CeOx performs better in this respect than ZnO. This is important because the reactivity in the WGS and RWGS reactions is related to the ability to activate H2O and CO2. The Ce3+ ions are identified as the most efficient sites for H2O and CO2 dissociation, while Cu0 keeps Ce3+ stable by promoting reduction of Ce4+ during the dissociation process. In this sense, the CeOx/Cu catalyst forms a bifunctional catalyst, which is more active in the (R)WGS than CeOx and Cu catalysts separately.

LanguageEnglish
Pages7994-8003
JournalACS Catalysis
Volume6
Issue number12
DOIs
StatePublished - 1 Jan 2016

Fingerprint

Carbon Monoxide
Photoelectron spectroscopy
Water gas shift
Chemical activation
X rays
Catalysts
Powders
Oxides
Nanoparticles
Ultraviolet visible spectroscopy
Surface plasmon resonance
X ray photoelectron spectroscopy
Ions
Oxidation
Experiments

Keywords

  • Activation of H2O
  • Bifunctional catalyst
  • Ceria
  • CO2
  • Cu-based model catalyst
  • In situ UV−vis
  • RWGS
  • WGS
  • XPS

Cite this

@article{448f17ecdaf444d389641d3065c3931c,
title = "Role of ZnO and CeOx in Cu-Based model catalysts in activation of h2O and CO2 dynamics studied by in situ ultraviolet−Visible and x‑ray photoelectron spectroscopy",
abstract = "Flat model and powder Cu, ZnO/Cu, and CeOx/Cu catalysts were studied by focusing on the role of the oxide phase as a promoter in the water gas shift (WGS) and its reverse reaction (RWGS). Activity measurements of the powder catalysts showed that both oxides enhance Cu reactivity, with CeOx/Cu being more active than ZnO/Cu in the WGS reaction. In situ ultraviolet−visible spectroscopy, exploiting the localized surface plasmon resonances of metallic Cu nanoparticles, together with X-ray photoelectron spectroscopy was then used to elucidate the origin of the enhanced reactivity on flat model catalysts. These experiments showed that ZnO and CeOx promote H2O and CO2 dissociation, leading to oxidation of the Cu nanoparticles. CeOx performs better in this respect than ZnO. This is important because the reactivity in the WGS and RWGS reactions is related to the ability to activate H2O and CO2. The Ce3+ ions are identified as the most efficient sites for H2O and CO2 dissociation, while Cu0 keeps Ce3+ stable by promoting reduction of Ce4+ during the dissociation process. In this sense, the CeOx/Cu catalyst forms a bifunctional catalyst, which is more active in the (R)WGS than CeOx and Cu catalysts separately.",
keywords = "Activation of H2O, Bifunctional catalyst, Ceria, CO2, Cu-based model catalyst, In situ UV−vis, RWGS, WGS, XPS",
author = "Yibin Bu and C.J. Weststrate and J.W. Niemantsverdriet and Fredriksson, {Hans O.A.}",
year = "2016",
month = "1",
day = "1",
doi = "10.1021/acscatal.6b02242",
language = "English",
volume = "6",
pages = "7994--8003",
journal = "ACS Catalysis",
issn = "2155-5435",
publisher = "American Chemical Society",
number = "12",

}

Role of ZnO and CeOx in Cu-Based model catalysts in activation of h2O and CO2 dynamics studied by in situ ultraviolet−Visible and x‑ray photoelectron spectroscopy. / Bu, Yibin; Weststrate, C.J.; Niemantsverdriet, J.W.; Fredriksson, Hans O.A.

In: ACS Catalysis, Vol. 6, No. 12, 01.01.2016, p. 7994-8003.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Role of ZnO and CeOx in Cu-Based model catalysts in activation of h2O and CO2 dynamics studied by in situ ultraviolet−Visible and x‑ray photoelectron spectroscopy

AU - Bu,Yibin

AU - Weststrate,C.J.

AU - Niemantsverdriet,J.W.

AU - Fredriksson,Hans O.A.

PY - 2016/1/1

Y1 - 2016/1/1

N2 - Flat model and powder Cu, ZnO/Cu, and CeOx/Cu catalysts were studied by focusing on the role of the oxide phase as a promoter in the water gas shift (WGS) and its reverse reaction (RWGS). Activity measurements of the powder catalysts showed that both oxides enhance Cu reactivity, with CeOx/Cu being more active than ZnO/Cu in the WGS reaction. In situ ultraviolet−visible spectroscopy, exploiting the localized surface plasmon resonances of metallic Cu nanoparticles, together with X-ray photoelectron spectroscopy was then used to elucidate the origin of the enhanced reactivity on flat model catalysts. These experiments showed that ZnO and CeOx promote H2O and CO2 dissociation, leading to oxidation of the Cu nanoparticles. CeOx performs better in this respect than ZnO. This is important because the reactivity in the WGS and RWGS reactions is related to the ability to activate H2O and CO2. The Ce3+ ions are identified as the most efficient sites for H2O and CO2 dissociation, while Cu0 keeps Ce3+ stable by promoting reduction of Ce4+ during the dissociation process. In this sense, the CeOx/Cu catalyst forms a bifunctional catalyst, which is more active in the (R)WGS than CeOx and Cu catalysts separately.

AB - Flat model and powder Cu, ZnO/Cu, and CeOx/Cu catalysts were studied by focusing on the role of the oxide phase as a promoter in the water gas shift (WGS) and its reverse reaction (RWGS). Activity measurements of the powder catalysts showed that both oxides enhance Cu reactivity, with CeOx/Cu being more active than ZnO/Cu in the WGS reaction. In situ ultraviolet−visible spectroscopy, exploiting the localized surface plasmon resonances of metallic Cu nanoparticles, together with X-ray photoelectron spectroscopy was then used to elucidate the origin of the enhanced reactivity on flat model catalysts. These experiments showed that ZnO and CeOx promote H2O and CO2 dissociation, leading to oxidation of the Cu nanoparticles. CeOx performs better in this respect than ZnO. This is important because the reactivity in the WGS and RWGS reactions is related to the ability to activate H2O and CO2. The Ce3+ ions are identified as the most efficient sites for H2O and CO2 dissociation, while Cu0 keeps Ce3+ stable by promoting reduction of Ce4+ during the dissociation process. In this sense, the CeOx/Cu catalyst forms a bifunctional catalyst, which is more active in the (R)WGS than CeOx and Cu catalysts separately.

KW - Activation of H2O

KW - Bifunctional catalyst

KW - Ceria

KW - CO2

KW - Cu-based model catalyst

KW - In situ UV−vis

KW - RWGS

KW - WGS

KW - XPS

UR - http://www.scopus.com/inward/record.url?scp=85046705973&partnerID=8YFLogxK

U2 - 10.1021/acscatal.6b02242

DO - 10.1021/acscatal.6b02242

M3 - Article

VL - 6

SP - 7994

EP - 8003

JO - ACS Catalysis

T2 - ACS Catalysis

JF - ACS Catalysis

SN - 2155-5435

IS - 12

ER -