Oxygen inhibition in the decomposition of NO on metal oxides and platinum

Amirnazmi, Ali

doi:10.1016/0021-9517(73)90051-1

Cited by 155 publications

(38 citation statements)

References 8 publications

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“…Therefore, no steady-state activity for NO decomposition will be displayed by platinum surfaces at moderate temperatures. This conclusion is in accordance with the literature [23,24].…”

Section: Adsorption and Reactivity Of No On Platinumsupporting

confidence: 94%

The interaction of nitric oxide with platinum and platinum-silver catalysts

Jong¹,

Meima

Geus

1982

Applications of Surface Science

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The interaction of NO with Pt/SiO 2 and PtAg/Si02 catalysts is investigated by infrared spectroscopy, volumetric chemisorption and mass spectrometry. Room temperature adsorption of NO on the reduced Pt/Si02 catalyst mainly leads to molecular adsorption, accompanied by a small N2 production. Infrared spectra reveal absorption bands at 1780 and 1600 cm j, ascribed to the stretching vibrations of linearly and bridged bonded NO species, respectively. Furthermore, a weak band at 1935 cm 'is observed. This high-frequency band is strongly enhanced when NO is dosed at elevated temperatures and is attributed to NO bound to Pt sites in the neighbourhood of adsorbed oxygen atoms. Reaction of NO with Pt/SiO2 at 400°Cleads to a limited dissociation of NO, producing N2 in the gas phase and leaving oxygen atoms to remain on the catalyst surface. With the PtAg/Si02 catalysts the 1600 cm band is absent, while the activity for NO dissociation has been lowered as compared to Pt/Si02. Alloying of Pt with Ag diminishes the amount of bridged bonded species which seem to precede dissociation, whereas linearly bonded species desorb molecularly at high temperatures. Investigations of the catalysts after oxidation at 400°C in 1 atm 02 show the adsorption of NO to be weaker and non-dissociative even at 400°C.

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“…Therefore, no steady-state activity for NO decomposition will be displayed by platinum surfaces at moderate temperatures. This conclusion is in accordance with the literature [23,24].…”

Section: Adsorption and Reactivity Of No On Platinumsupporting

confidence: 94%

The interaction of nitric oxide with platinum and platinum-silver catalysts

Jong¹,

Meima

Geus

1982

Applications of Surface Science

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“…Vários materiais que incluem principalmente metais, óxidos metálicos e zeólitas tem sido usados para a decomposição do NO [11][12][13][14][15]. Entretanto, depois que Iwamoto et al [16] descobriram a alta atividade dos catalisadores de cobre suportados em zeólita para a decomposição do NO, o sistema Cu-ZSM-5 tem sido alvo de intensa pesquisa.…”

Section: Introductionunclassified

Síntese da zeólita ZSM-5 e suas propriedades estruturais após troca iônica com cobre

2000

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A zeólita ZSM-5 foi sintetizada utilizando sílica "Aerosil-Degussa -- 380 m²/g" como fonte de silício, em substituição ao trisilicato de sódio, que é normalmente utilizado na síntese dessa zeólita. Subseqüentemente, foi incorporado cobre à ZSM-5 através do método convencional de troca iônica. Técnicas de difração de raios X, microscopia eletrônica de varredura, área superficial e análise elementar por absorção atômica foram utilizadas para verificar a formação da zeólita sintetizada e suas propriedades após troca com cobre. Os resultados mostraram que houve a formação da ZSM-5 nas condições de síntese empregadas e que a amostra modificada pelo processo de troca manteve as propriedades da zeólita original.

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“…It is the same phenomenon as that observed for the traditional catalytic reduction of NO on these two oxides. And it is known that CuO has a better catalytic activity than NiO [35, 36]. These papers made it clear that the bond breaking of NO was one of the restrictions for the electrochemical reduction of NO.…”

Section: Influencing Factorsmentioning

confidence: 99%

Recent Developments of Electrochemical Promotion of Catalysis in the Techniques of DeNOx

Tang

Xu²,

et al. 2013

The Scientific World Journal

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Electrochemical promotion of catalysis reactions (EPOC) is one of the most significant discoveries in the field of catalytic and environmental protection. The work presented in this paper focuses on the aspects of reaction mechanism, influencing factors, and recent positive results. It has been shown with more than 80 different catalytic systems that the catalytic activity and selectivity of conductive catalysts deposited on solid electrolytes can be altered in the last 30 years. The active ingredient of catalyst can be activated by applying constant voltage or constant current to the catalysts/electrolyte interface. The effect of EPOC can improve greatly the conversion rate of NOx. And it can also improve the lifetime of catalyst by inhibiting its poisoning.

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Oxygen inhibition in the decomposition of NO on metal oxides and platinum

Cited by 155 publications

References 8 publications

The interaction of nitric oxide with platinum and platinum-silver catalysts

The interaction of nitric oxide with platinum and platinum-silver catalysts

Síntese da zeólita ZSM-5 e suas propriedades estruturais após troca iônica com cobre

Recent Developments of Electrochemical Promotion of Catalysis in the Techniques of DeNOx

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