Sintering inhibition mechanism of platinum supported on ceria-based oxide and Pt-oxide–support interaction

Nagai, Yasutaka; Hirabayashi, Takeshi; Dohmae, Kazuhiko; Takagi, Nobuyuki; Minami, Takashi; Shinjoh, Hirofumi; Matsumoto, Shinichi

doi:10.1016/j.jcat.2006.06.002

Cited by 568 publications

(331 citation statements)

References 19 publications

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“…agreement with previous studies which showed that the Pt interactions with alumina were much weaker 87 , thus explaining the lack of Pt re-dispersion in Pt/γ-Al2O3.…”

supporting

confidence: 92%

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Metal Redispersion Strategies for Recycling of Supported Metal Catalysts: A Perspective

Morgan¹,

Goguet²,

Hardacre³

2015

ACS Catal.

182

152

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Catalyst deactivation is ultimately inevitable, and one of the processes known to cause deactivation is sintering of metal particles. Consequently, numerous methods to reverse the sintering process by re-dispersing metal nanoparticles have been developed. These methods are discussed in this perspective, and the reported mechanisms of re-dispersion are summarized. Additionally, the longer term practical use of such treatments, and the benefits this can bring, is briefly disclosed.

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“…agreement with previous studies which showed that the Pt interactions with alumina were much weaker 87 , thus explaining the lack of Pt re-dispersion in Pt/γ-Al2O3.…”

supporting

confidence: 92%

“…87 The formation of Mg2PtO4 compounds during the air aging process is thought to inhibit Pt sintering, thereby explaining the stability of Pt/MgO under high temperature oxidizing conditions. This is in…”

Section: Platinummentioning

confidence: 99%

Metal Redispersion Strategies for Recycling of Supported Metal Catalysts: A Perspective

Morgan¹,

Goguet²,

Hardacre³

2015

ACS Catal.

182

152

View full text Add to dashboard Cite

show abstract

“…This result suggests that Pt in the slightly metallic state supported on Al2O3 forms the catalytically active sites for the total oxidation of HCs. The valence state of Pt supported on metal oxide is known to vary depending on the surface acidity of the metal oxide used as support 26), 34) . The surface of Pt particles supported on Y-stabilized ZrO2 with high Y content is stabilized in the cationic state 35), 36) , due to the strong interaction between Pt and Y2O3 as basic sites.…”

Section: Catalytic Activity Of Supported Pt Catalysts Formentioning

confidence: 99%

Development of Diesel Hydrocarbon Oxidation Catalysts Aimed at Reducing Platinum Group Metals Usage

Haneda

Sasaki

Hamada

2015

J. Jpn. Petrol. Inst.

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Highly active diesel oxidation catalyst for the oxidation of diesel hydrocarbons, with minimal use of platinum group metals, was developed. Pt/Al2O3 showed the highest activity for total oxidation of a mixture of n-decane and 1-methylnaphthalene as model fuel-originated hydrocarbons even after high temperature aging at 750 for 5 h in air. The surface density of acid sites on Al2O3 was found to be important to stabilize the Pt surface in the active metallic state, resulting in high hydrocarbon oxidation activity. The catalytic activity of Pt/Al2O3 was strongly dependent on the Pt dispersion. Based on the findings of in-situ FT-IR spectroscopy, a reaction mechanism was proposed, in which acrylate species as reaction intermediate formed on Pt migrates to the acid-base centers of the Al2O3 surface and then reacts with O2 to form CO2. On the basis of these findings, we successfully developed highly active diesel oxidation catalyst by the addition of Pd with Pt/Pd weight ratio of 3/1 and the use of Al2O3 support modified with acidic additives such as WO3.

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“…Investigations to inhibit the sintering of noble metal particles, especially of Pt, have been extensively carried out 8)～12) . For example, Nagai et al 10) reported that Pt in Pt/ceria-based oxide does not sinter after aging treatment at 800 in air, but does sinter in Pt/Al2O3. This phenomenon was explained by the formation of Pt _ O _ Ce bonds (i.e., the Pt _ oxide _ support interaction) which act as an anchor for Pt particles on ceria-based oxides.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Reactivity Analysis of Hydrogen Adspecies on Platinum Nano-particles Supported on Alumina

Haneda

Watanabe

Ozawa

2012

J. Jpn. Petrol. Inst.

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The dispersion state of Pt nano-particles supported on Al2O3 was investigated by gas chemisorption. The amount of H2 chemisorption was larger than that of CO over the entire range of Pt dispersion. Pt dispersion beyond 100 % was estimated for Pt/Al2O3 with nano-sized Pt particles by H2 chemisorption. FT-IR measurements of hydrogen species adsorbed on Pt/Al2O3 with different Pt dispersions revealed that hydrogen species dissociatively adsorbed on Pt nano-particles and spilled over onto Al2O3. Hydrogen species dissociatively adsorbed on Pt nano-particles were highly reactive with NO at room temperature, leading to the formation of N2.In contrast, hydrogen species spilled over onto the fringes of Pt particles reacted with NO to form N2O.

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Sintering inhibition mechanism of platinum supported on ceria-based oxide and Pt-oxide–support interaction

Cited by 568 publications

References 19 publications

Metal Redispersion Strategies for Recycling of Supported Metal Catalysts: A Perspective

Metal Redispersion Strategies for Recycling of Supported Metal Catalysts: A Perspective

Development of Diesel Hydrocarbon Oxidation Catalysts Aimed at Reducing Platinum Group Metals Usage

Characterization and Reactivity Analysis of Hydrogen Adspecies on Platinum Nano-particles Supported on Alumina

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