In situ infrared study of catalytic decomposition of NO on carbon-supported Rh and Pd catalysts

Almusaiteer, Khalid; Krishnamurthy, R.; Chuang, Steven S. C.

doi:10.1016/s0920-5861(99)00242-4

Cited by 45 publications

(27 citation statements)

References 20 publications

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“…Thus, we agree with Almusaiteer et al [27] who found that NO decomposition over an alumina supported rhodium catalyst occurs according to the equation: Rh + 2NO → 2Rh-O +,N 2 . Wang et al [20] claimed that low temperature NO decomposition in the absence of oxygen over an alumina supported platinum catalyst initially yields N 2 and N 2 O and results in rapid catalyst deactivation due to oxygen poisoning.…”

Section: Resultssupporting

confidence: 93%

“…The absence of rapid catalyst deactivation by oxygen adsorption over our Rh/Al 2 O 3 catalyst may be attributed to the migration of oxygen from rhodium to aluminum atoms. Suppression of Rh poisoning by oxygen due to oxygen migration to support was earlier observed by Almusaiteer et al [27] for a Rh/C catalyst. 2− with basic OH groups of alumina and both cationic and anionic exchange.…”

Section: Resultssupporting

confidence: 67%

“…Platinum, rhodium and palladium supported on oxides are known to be the most active catalysts in NO decomposition [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29], [30] and [31].…”

Section: Introductionmentioning

confidence: 99%

“…Almusaiteer et al [27] have studied NO decomposition process at 673 K over Rh and Pd catalysts supported on alumina and carbon. They have observed poisoning of the Rh/Al 2 O 3 and Pd/Al 2 O 3 with the oxygen originating from NO decomposition.…”

Section: Introductionmentioning

confidence: 99%

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The effect of the Rh–Al, Pt–Al and Pt–Rh–Al surface alloys on NO conversion to N2 on alumina supported Rh, Pt and Pt–Rh catalysts

et al. 2007

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NO conversion to N 2 in the presence of methane and oxygen over 0.03 at.% Rh/Al 2 O 3 , 0.51 at.% Pt/Al 2 O 3 and 0.34 at.% Pt-0.03 at.% Rh/Al 2 O 3 catalysts was investigated. δ-Alumina and precious metal-aluminum alloy phases were revealed by XRD and HRTEM in the catalysts. The results of the catalytic activity investigations, with temperature-programmed as well as steady-state methods, showed that NO decomposition occurs at a reasonable rate on the alloy surfaces at temperatures up to 623 K whereas some CH 4 deNO x takes place on δ-alumina above this temperature. A mechanism for the NO decomposition is proposed herein. It is based on NO adsorption on the precious metal atoms followed by the transfer of electrons from alloy to antibonding π orbitals of NO (ads.) molecules. The CH 4 deNO x was shown to occur according to an earlier proposed mechanism, via methane oxidation by NO 2(ads.) to oxygenates and then NO reduction by oxygenates to N 2 .

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of the Rh–Al, Pt–Al and Pt–Rh–Al surface alloys on NO conversion to N2 on alumina supported Rh, Pt and Pt–Rh catalysts

et al. 2007

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“…Oxide supported Pt, Rh and Pd high-loaded catalysts are known to be the most active in the direct NO decomposition among the metal catalysts supported on metal oxides (Almusaiteer et al, 2000;Garin, 2001;Gorte et al, 1981;Ishii et al, 2002;Papp & Sabde, 2005;Pietraszek et al, 2007;Rahkamaa & Salmi, 1999;Root et al, 1983;Sugisawa et al, 2001;X. Wang et al, 2004).…”

Section: The No Direct Decomposition In the Oxygen Presence Over Alummentioning

confidence: 99%

Alloying Effect in Low Loaded Rh Catalysts Supported on High Surface Area Alumina on Their Activity in CH4 and NO Decomposition

Costa¹,

Dutkiewicz²,

Choque³

et al. 2012

Noble Metals

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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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In situ infrared study of catalytic decomposition of NO on carbon-supported Rh and Pd catalysts

Cited by 45 publications

References 20 publications

The effect of the Rh–Al, Pt–Al and Pt–Rh–Al surface alloys on NO conversion to N2 on alumina supported Rh, Pt and Pt–Rh catalysts

The effect of the Rh–Al, Pt–Al and Pt–Rh–Al surface alloys on NO conversion to N2 on alumina supported Rh, Pt and Pt–Rh catalysts

Alloying Effect in Low Loaded Rh Catalysts Supported on High Surface Area Alumina on Their Activity in CH4 and NO Decomposition

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

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