Operando X-ray absorption spectroscopy study of supported Pt catalysts during NO reduction by hydrocarbons

Tanabe, Toshitaka; Nagai, Yasutaka; Dohmae, Kazuhiko; Takagi, Nobuyuki; Takahashi, Naoki; Matsumoto, Shin’inch; Shinjoh, Hirofumi

doi:10.1016/j.apcatb.2011.03.033

Cited by 20 publications

(13 citation statements)

References 65 publications

(88 reference statements)

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“…In Pd-containing catalysts, Pd metal shows higher oxidation activity than Pd oxide [7]. To directly promote the formation of more active metallic Pd, i.e.…”

Section: Addition Of Au To Pd Cluster (Au-pd Bimetallicmentioning

confidence: 99%

“…By using newly developed supports, the Rh catalyst maintained progressively higher dispersion and achieved increasing NO x conversion. Tanabea et al [7] analyzed the relationship between the oxidation state of the PGM active site and catalytic activity under NO x reduction reaction conditions. These results indicated that PGM sites are active when in their metallic state.…”

Section: Rh Sintering Preventionmentioning

confidence: 99%

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Recent Research Progress in Automotive Exhaust Gas Purification Catalyst

Hirata

2014

Catal Surv Asia

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In automotive catalysis, the exhaust gas purification catalyst is expected to maintain a high level of importance for the next several decades. Current exhaust gas purification catalysts contain platinum group metals (PGM; Pt, Pd and Rh), and exhaust gas purification reactions occur on the PGM surface. The total demand for PGM is increasing yearly due to the introduction of stricter exhaust gas regulations and the increase in automobile production. Given the limited global PGM resources, catalysts with decreased PGM content or alternative technologies are needed. In this manuscript, the latest results of our research towards the aforementioned needs are introduced.Keywords Exhaust gas purification catalyst Á Platinum group metals decrease Á Platinum group metals substitution Á Metal support interaction Á Platinum group metals cluster Á Bimetallic cluster 1 Introduction

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“…In Pd-containing catalysts, Pd metal shows higher oxidation activity than Pd oxide [7]. To directly promote the formation of more active metallic Pd, i.e.…”

Section: Addition Of Au To Pd Cluster (Au-pd Bimetallicmentioning

confidence: 99%

Section: Rh Sintering Preventionmentioning

confidence: 99%

Recent Research Progress in Automotive Exhaust Gas Purification Catalyst

Hirata

2014

Catal Surv Asia

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“…It should also be taken into consideration that C 3 H 6 species act as reductants for the remaining O atoms on the Rh surface. In line with a previous report on Pt catalysts, the remaining O atoms will react with C 3 H 6 species adsorbed on neighboring Rh 0 surface atoms to regenerate the active sites for NO adsorption . From this perspective, the probability to form a Rh 0 ensemble can be related to the catalytic activity.…”

Section: Resultsmentioning

confidence: 98%

Formation of Rhodium Metal Ensembles that Facilitate Nitric Oxide Reduction over Rhodium/Ceria in a Stoichiometric Nitric Oxide–Carbon Monoxide–Propene–Oxygen Reaction

2018

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A series of ceria‐supported Rh nanoparticles (NPs) that have various particle sizes of 2–7 nm was prepared to investigate the size effect of Rh NPs on NO reduction in NO–CO–C3H6–O2 under stoichiometric conditions. The turnover frequency (TOF) for NO reduction on Rh NPs increased drastically according to their particle size. The strong size dependence of the TOF was attributed to the oxidation states of Rh NPs but not to particle geometries, which include fractions of surface local sites (e.g., corner, edge, plane) and the surface crystal structures (e.g., Rh(1 1 1), (1 0 0)). The variation of the TOF with the Rh metal fraction suggested that Rh metal ensembles are highly active species for NO reduction.

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“…This method has been used as a powerful probe of the local structure and oxidation state of the supported PGM under reaction conditions [23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%