Dynamics of Rh nanoparticle surface structure during NO reduction revealed by operando transmission electron microscopy

Tanaka, Hiromochi; Orita, Koji; Maede, Atsushi; Ishikawa, Hiroyuki; Miura, Masahide; Arai, Shigeo; Higuchi, Tetsuo; Ohta, Shozo; Muto, Shunsuke

doi:10.1016/j.apcata.2021.118334

Cited by 7 publications

(9 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is clear that Rh behaves like a promoter to buffer electrons and cooperates with the Ce 3+ ion to complete the task of NO reduction. This reaction picture is remarkably different from the traditional understanding on Rh catalysis that Rh always plays a role to master the catalytic reactions directly [3a,8g,22a,23] . The concept of single‐atom promoter that the noble metal (NM) single atom was not directly involved in the catalysis as a player while serving as a promoter by affecting the electronic properties of metal atoms in the supports was proposed recently [24] .…”

Section: Resultsmentioning

confidence: 99%

Catalytic NO Reduction by NO Pre‐Adsorbed RhCeO₂NO⁻Clusters

et al. 2022

View full text Add to dashboard Cite

A fundamental understanding on the dynamically structural evolution of catalysts induced by reactant gases under working conditions is challenging but pivotal in catalyst design. Herein, in combination with state-of-the-art mass spectrometry for cluster reactions, cryogenic photoelectron imaging spectroscopy, and quantum-chemical calculations, we identified that NO adsorption on rhodium-cerium bimetallic oxide cluster RhCeO 2À can create a Ce 3 + ion in product RhCeO 2 NO À that serves as the starting point to trigger the catalysis of NO reduction by CO. Theoretical calculations substantiated that the reduction of another two NO molecules into N 2 O takes place exclusively on the Ce 3 + ion while Rh behaves like a promoter to buffer electrons and cooperates with Ce 3 + to drive NO reduction. Our finding demonstrates the importance of NO in regulating the catalytic behavior of Rh under reaction conditions and provides much-needed insights into the essence of NO reduction over Rh/CeO 2 , one of the most efficient components in three-way catalysts for NO x removal.

show abstract

Section: Resultsmentioning

confidence: 99%

Catalytic NO Reduction by NO Pre‐Adsorbed RhCeO₂NO⁻Clusters

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Similar dynamic surface structural evolution is also recently demonstrated in an operando TEM study of Rh NPs/ZrO 2 during NO reduction at elevated temperatures. [ 177 ] The operando study couples a high‐voltage electron microscope (HVEM) with a quadrupole mass spectrometer (QMS) for monitoring the NO reduction and reveals cycles of appearance and disappearance of a metastable surface oxide film on Rh NPs under elevated temperatures, which contributes to NO decomposition in terms of the uptake and release of oxygen. The NO reduction reaction was monitored by QMS‐SIM (selective ion monitoring) analysis of the NO consumption and the N 2 generation.…”

Section: Heterogeneous Catalysts Under Gaseous Reactant Reaction Cond...mentioning

confidence: 99%

“…ETEM study of C 2 H 4 carbon deposition on Ni/CeO 2 and Ni/SiO 2 catalysts [182] revealed oxygen transfer at the metal-support interface during the initial stages of carbon deposition. There is a localized reduction zone at the metal-CeO 2 [177] Copyright 2021, Elsevier.…”

Section: Monometallic Catalystsmentioning

confidence: 99%

See 1 more Smart Citation

Insights into Heterogeneous Catalysts under Reaction Conditions by In Situ/Operando Electron Microscopy

Cheng

Wang

Chen

et al. 2022

Advanced Energy Materials

View full text Add to dashboard Cite

The advancement of clean energy and environment depends strongly on the development of efficient catalysts in a wide range of heterogeneous catalytic reactions, which has benefited from transmission electron microscopic techniques in determining the atomic‐scale morphologies and structures. However, it is the morphology and structure under the catalytic reaction conditions that determine the performance of the catalyst, which has captured a surge of interest in developing and applying in situ/operando transmission electron microscopic techniques in heterogeneous catalysis. The major theme of this review is to highlight some of the most recent insights into heterogeneous catalysts under the relevant reaction conditions using in situ/operando transmission electron microscopic techniques. Rather than a comprehensive overview of the basic principles of in situ/operando techniques, this review focuses on the insights into the atomic‐scale/nanoscale details of various catalysts ranging from single‐component to multicomponent catalysts under heterogeneous catalytic, electrocatalytic, and photocatalytic reaction conditions involving both gas–solid and liquid–solid interfaces. This focus is coupled with discussions of the correlation of the atomic, molecular, and nanoscale morphology, composition, and structure with the catalytic properties under the reaction conditions, shining light on the challenges and opportunities in design of nanostructured catalysts for clean and sustainable energy applications.

show abstract

“…Rh nanoparticles have attracted considerable interest from their excellent thermal stability and catalytic efficiency in various chemical processes, , such as CO oxidation, − NO reduction, − and hydrogenation. − Along with Pt and Pd, Rh has been commercially used in automobile catalytic converters to transform hazardous nitrogen oxides (NOx) into innocuous gases. − Moreover, noble metal elements such as Pt and Pd, characterized by high chemical stability and suitable physicochemical properties, have been widely employed for diagnosis and therapy in addition to Au, which is a universal element for bioapplications. − Analogously, Rh potential applications to biomedical fields in a series of flows have recently been explored. , …”

Section: Introductionmentioning

confidence: 99%

Rhodium–Tellurium Nanorod Synthesis Using Galvanic Replacement-Polyol Regrowth for Thermo-Dynamic Dual-Modal Cancer Phototherapy

Kang

Yim

Chae

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Rh is a noble metal introduced in bioapplications, including diagnosis and therapy, in addition to its consolidated utilization in organic catalysis and electrocatalysis. Herein, we designed the synthesis of highly crystalline Rh nanocrystal-decorated Rh–Te nanorods (RhTeNRs) through galvanic replacement of sacrificial Te nanorod (TeNR) templates and subsequent polyol regrowth. The obtained RhTeNRs showed excellent colloidal stability and efficient heat dissipation and photocatalytic activity under various laser irradiation wavelengths. Based on the confirmed biocompatibility, RhTeNRs were introduced into in vitro and in vivo cancer phototherapies. The results confirmed the selective physical death of cancer cells in the local area through laser irradiation. While chemotherapy does not guarantee successful treatment due to side effects and resistance, phototherapy using heat and reactive oxygen species generation of RhTeNRs induces physical death.

show abstract

Dynamics of Rh nanoparticle surface structure during NO reduction revealed by operando transmission electron microscopy

Cited by 7 publications

References 59 publications

Catalytic NO Reduction by NO Pre‐Adsorbed RhCeO₂NO⁻Clusters

Catalytic NO Reduction by NO Pre‐Adsorbed RhCeO₂NO⁻Clusters

Insights into Heterogeneous Catalysts under Reaction Conditions by In Situ/Operando Electron Microscopy

Rhodium–Tellurium Nanorod Synthesis Using Galvanic Replacement-Polyol Regrowth for Thermo-Dynamic Dual-Modal Cancer Phototherapy

Contact Info

Product

Resources

About

Dynamics of Rh nanoparticle surface structure during NO reduction revealed by operando transmission electron microscopy

Cited by 7 publications

References 59 publications

Catalytic NO Reduction by NO Pre‐Adsorbed RhCeO2NO−Clusters

Catalytic NO Reduction by NO Pre‐Adsorbed RhCeO2NO−Clusters

Insights into Heterogeneous Catalysts under Reaction Conditions by In Situ/Operando Electron Microscopy

Rhodium–Tellurium Nanorod Synthesis Using Galvanic Replacement-Polyol Regrowth for Thermo-Dynamic Dual-Modal Cancer Phototherapy

Contact Info

Product

Resources

About

Catalytic NO Reduction by NO Pre‐Adsorbed RhCeO₂NO⁻Clusters

Catalytic NO Reduction by NO Pre‐Adsorbed RhCeO₂NO⁻Clusters