Effect of Ceria Support on the Structure of Ni Nanoparticles

Zhou, Yinghui; Perket, Justin M.; Crooks, Adam B.; Zhou, Jing

doi:10.1021/jz1003044

Cited by 48 publications

(58 citation statements)

References 46 publications

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“…cations. From studies of STM [5], it is known that Ni grows on CeO 2 (111) at 300 K forming three dimensional particles that sinter upon annealing to higher temperatures (500-800 K) [5]. Since Ni and Ce can form mixed-metal oxides [6,8], migration of the Ni admetal into the CeO 2 (111) substrate upon annealing is possible.…”

Section: Resultsmentioning

confidence: 99%

“…To avoid problems with charging in the photoemission and NEXAFS experiments, films of CeO 2 (111) were grown in situ onto a hot Ru(0001) substrate (700 K) using a commercial built four pocket Oxford evaporator in an O 2 atmosphere (1 9 10 -7 Torr). Previous studies have been devoted to understanding this growth and the formation of well defined 111 surfaces [5,21,23]. Ni was evaporated on to CeO 2 (111) surfaces at 300 K. The Ni/CeO 2 (111) systems were exposed to CO (99.99% Sigma-Aldrich) in the UHV chambers at 100 or 300 K.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Previous studies of scanning tunneling microscopy (STM) have revealed that Ni grows on CeO 2 (111) at 300 K forming three dimensional particles [5]. Annealing to higher temperatures (500-800 K) induces the sintering of the Ni particles [5] and also a possible migration of the admetal into the ceria substrate [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…The activity and selectivity of the supported nickel catalysts are strongly dependent on the amount of metal employed, the size of the dispersed metal particles, metal-support interactions and the composition of the support [1,2]. A fundamental understanding of these parameters is necessary for a rational design of nickelbased catalysts [1][2][3][4][5]. In this article, we investigate the WGS and CO methanation reactions over Ni-CeO 2 (111) catalysts.…”

Section: Introductionmentioning

confidence: 99%

“…Annealing to higher temperatures (500-800 K) induces the sintering of the Ni particles [5] and also a possible migration of the admetal into the ceria substrate [5,6]. Photoemission experiments for the deposition of nickel on reduced ceria films point to intermixing with the ceria covering Ni or NiO x particles [6].…”

Section: Introductionmentioning

confidence: 99%

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Water–Gas Shift and CO Methanation Reactions over Ni–CeO2(111) Catalysts

et al. 2011

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X-ray and ultraviolet photoelectron spectroscopies were used to study the interaction of Ni atoms with CeO2(111) surfaces. Upon adsorption on CeO2(111) at 300 K, nickel remains in a metallic state. Heating to elevated temperatures (500–800 K) leads to partial reduction of the ceria substrate with the formation of Ni2+ species that exists as NiO and/or Ce1−xNixO2−y. Interactions of nickel with the oxide substrate significantly reduce the density of occupied Ni 3d states near the Fermi level. The results of core-level photoemission and near-edge X-ray absorption fine structure point to weakly bound CO species on CeO2(111) which are clearly distinguishable from the formation of chemisorbed carbonates. In the presence of Ni, a stronger interaction is observed with chemisorption of CO on the admetal. When the Ni is in contact with Ce+3 cations, CO dissociates on the surface at 300 K forming NiCx compounds that may be involved in the formation of CH4 at higher temperatures. At medium and large Ni coverages (>0.3 ML), the Ni/CeO2(111) surfaces are able to catalyze the production of methane from CO and H2, with an activity slightly higher than that of Ni(100) or Ni(111). On the other hand, at small coverages of Ni (<0.3 ML), the Ni/CeO2(111) surfaces exhibit a very low activity for CO methanation but are very good catalysts for the water–gas shift reaction

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Water–Gas Shift and CO Methanation Reactions over Ni–CeO2(111) Catalysts

et al. 2011

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High Activity of Ce_1−xNi_xO_2−y for H₂ Production through Ethanol Steam Reforming: Tuning Catalytic Performance through Metal–Oxide Interactions

et al. 2010

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Nur mit Oxid: Ce0.8Ni0.2O2−y ist ein ausgezeichneter Katalysator für die Dampfreformierung von Ethanol (siehe Diagramm). Metall‐Oxid‐Wechselwirkungen beeinflussen die elektronischen Eigenschaften kleiner Nickelpartikel, die unter den Reaktionsbedingungen am Katalysator vorliegen, und unterdrücken die Methanbildung. In das Ceroxid eingelagertes Nickel führt zu O‐Leerstellen, die den O‐H‐Bindungsbruch in Ethanol und Wasser erleichtern.

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High Activity of Ce_1−xNi_xO_2−y for H₂ Production through Ethanol Steam Reforming: Tuning Catalytic Performance through Metal–Oxide Interactions

et al. 2010

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The importance of the oxide: Ce0.8Ni0.2O2−y is an excellent catalyst for ethanol steam reforming (see graph). Metal–oxide interactions perturb the electronic properties of the small particles of metallic nickel present in the catalyst under the reaction conditions and thus suppress any methanation activity. The nickel embedded in ceria induces the formation of O vacancies, which facilitate cleavage of the OH bonds in ethanol and water.

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Effect of Ceria Support on the Structure of Ni Nanoparticles

Cited by 48 publications

References 46 publications

Water–Gas Shift and CO Methanation Reactions over Ni–CeO2(111) Catalysts

Water–Gas Shift and CO Methanation Reactions over Ni–CeO2(111) Catalysts

High Activity of Ce_1−xNi_xO_2−y for H₂ Production through Ethanol Steam Reforming: Tuning Catalytic Performance through Metal–Oxide Interactions

High Activity of Ce_1−xNi_xO_2−y for H₂ Production through Ethanol Steam Reforming: Tuning Catalytic Performance through Metal–Oxide Interactions

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Effect of Ceria Support on the Structure of Ni Nanoparticles

Cited by 48 publications

References 46 publications

Water–Gas Shift and CO Methanation Reactions over Ni–CeO2(111) Catalysts

Water–Gas Shift and CO Methanation Reactions over Ni–CeO2(111) Catalysts

High Activity of Ce1−xNixO2−y for H2 Production through Ethanol Steam Reforming: Tuning Catalytic Performance through Metal–Oxide Interactions

High Activity of Ce1−xNixO2−y for H2 Production through Ethanol Steam Reforming: Tuning Catalytic Performance through Metal–Oxide Interactions

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Product

Resources

About

High Activity of Ce_1−xNi_xO_2−y for H₂ Production through Ethanol Steam Reforming: Tuning Catalytic Performance through Metal–Oxide Interactions

High Activity of Ce_1−xNi_xO_2−y for H₂ Production through Ethanol Steam Reforming: Tuning Catalytic Performance through Metal–Oxide Interactions