Metal oxide activities in the oxidation of ethylene

Dmuchovsky, Basil; Freerks, Marshall C.; Zienty, Ferdinand B.

doi:10.1016/0021-9517(65)90162-4

Cited by 40 publications

(22 citation statements)

References 8 publications

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“…The active material so obtained normally contains more than one phase, whose compositions may be expressed in terms of mixed oxides of Vi v, VV and Mo, e.g. M06V~+V4+040 and M04V~+V1+025 [194]. One function of the Mo seems likely to be the control and stabilization of the ratio of the vanadium atoms in the IV and V oxidation states, i.e.…”

Section: Kinetics Mechanisms and Catalyst Sciencementioning

confidence: 98%

“…For example, the heating [194,195] of a solution of ammonium metavanadate and ammonium molybdate (often together with precursors of other catalyst modifiers such as sodium phosphate and nickel nitrate) in concentrated hydrochloric acid leads to reduction by the solvent. The solid obtained on evaporation contains comparable quantities of V IV and VV, the exact proportions being dependant upon the conditions.…”

Section: Kinetics Mechanisms and Catalyst Sciencementioning

confidence: 99%

“…Chemisorbed phenol does not appear to be an intermediate, and it has been suggested [192,194] that path 2 involves attack on the benzene at adjacent atoms, perhaps via chemisorbed 1,2-benzo-…”

Section: Kinetics Mechanisms and Catalyst Sciencementioning

confidence: 99%

See 2 more Smart Citations

The Historical Development of Catalytic Oxidation Processes

Chinchen¹,

Davies

Sampson³

1987

Catalysis

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Section: Kinetics Mechanisms and Catalyst Sciencementioning

confidence: 98%

Section: Kinetics Mechanisms and Catalyst Sciencementioning

confidence: 99%

See 1 more Smart Citation

The Historical Development of Catalytic Oxidation Processes

Chinchen¹,

Davies

Sampson³

1987

Catalysis

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“…No primeiro caso, observou-se que os óxidos de cobalto e de cromo eram os catalisadores mais ativos e que a energia de ativação poderia refletir, de modo preciso, a atividade intrínse-ca 25 . Entretanto, os dados apresentados pelos autores não eram suficientemente extensivos para sustentar esta afirmação.…”

Section: Oxidação De Compostos Orgânicos Voláteisunclassified

Impacto dos catalisadores automotivos no controle da qualidade do ar

Rangel

Carvalho

2003

Quím. Nova

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Recebido em 4/4/02; aceito em 17/6/02 IMPACT OF AUTOMOTIVE CATALYSTS IN THE CONTROL OF AIR QUALITY. Advanced industrialized nations have experienced severe pollution problems over the past forty years, caused mainly by carbon monoxide, hydrocarbons and nitrogen oxide emissions from automobiles. Catalyst technology has played a major part in minimizing these emissions as required by even more restrictive laws. The catalyst has been optimized over the years to meet the requirements of high activity and long life. The oxidation of hydrocarbon and carbon monoxide are in advanced development stage while that of NO x catalysts is far less advanced. In the future, catalyst technology is expected to contribute to overcome the challenges to get a cleaner air.Keywords: automotive catalysts; pollution; air quality. CONSIDERAÇÕES GERAISDevido ao rápido movimento de seu meio fluido, a atmosfera tornou-se um dos mais convenientes lugares para o depósito de materiais indesejáveis, causando inúmeros problemas ambientais. Entre os principais, nos dias atuais, estão o aquecimento da Terra, a chuva ácida e o efeito estufa. Este último é causado por gases quimicamente estáveis e inertes o suficiente para se acumularem na atmosfera, tais como o dióxido de carbono, o metano, os óxidos de nitrogênio e os compostos fluorcarbonados clorados.Um dos agentes que mais contribui para a poluição do ar é o automóvel. Em áreas urbanas, isso é demonstrado dramaticamente pela fumaça fotoquímica, resultante da interação entre óxidos de nitrogênio, hidrocarbonetos e luz solar, para formar produtos de oxidação, que causam irritação aos olhos, ao aparelho respiratório e danos às plantas 1 . Como os automóveis emitem esses compostos, além de monóxido de carbono, de dióxido de enxofre e de compostos aromáticos, eles contribuem diretamente para a fumaça fotoquímica e outras formas de poluição 2 . O tipo e a composição do combustível usado nos automóveis influenciam, de modo significativo, nas diferentes formas de contaminação às quais o meio ambiente está sujeito. Os carros movidos a álcool, por exemplo, produzem altas emissões de aldeídos (principalmente formaldeído e acetaldeído) em relação àqueles movidos à gasolina. Os veículos movidos por misturas 20% etanol-gasolina (v/ v) emitem mais aldeídos totais e óxidos de nitrogênio do que a gasolina. São também elevadas as emissões de álcool não-carburado, principalmente com a ignição a frio 3 .Os aldeídos e outros compostos carbonílicos, diretamente emitidos na atmosfera, participam como precursores de reações fotoquímicas, produzindo ácido nítrico e nitrato de peroxiacetila (PAN), entre outros 4 . Esses compostos são, em geral, fitotóxicos ou irritantes para os olhos ou vias respiratórias, como é o caso do PAN, do ozônio e do peróxido de hidrogênio 5 . A combustão catalítica constitui a alternativa mais conveniente para eliminar compostos orgânicos, em baixas concentrações, em fase vapor. As principais vantagens desse processo, comparado com outras formas de descontaminação, são a alta eficiência em baix...

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“…Their effectiveness is primarily due to the various oxidation states that Mo and V can occupy and which can be cycled in a facile fashion under suitable conditions. Their combination as a complex metal oxide has proved successful for a number of oxidation reactions such as benzene to maleic anhydride 7) , methanol to formaldehyde 8), 9) , oxidative dehydrogenation of ethane 10) and acrolein to acrylic acid 11),12) . More recently, the development of a complex Mo _ V _ O based catalyst by Mitsubishi Chemical Corp. has proved commercially attractive for propane oxidation to acrylic acid and the ammoxidation of propane to acrylonitrile 13) 16) .…”

Section: Recent Developments Of Complex Metal Oxide C a T A L Y S T Smentioning

confidence: 99%

Establishment of Crystalline Complex Mo–V–Oxides as Selective Oxidation Catalysts

Ueda

2013

J. Jpn. Petrol. Inst.

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Solid-state metal oxides with three-dimensional organization of catalytic components at nano-scale have high potential as catalysts for chemical conversion because the materials could provide unique reaction fields at catalytic active sites which are particularly important for multi-step catalytic reactions like selective oxidation. Here, crystalline Mo3VOx, a new type complex metal oxide catalyst, is introduced as a prominent example of solid-state metal oxides with three-dimensional organization. The material has a network arrangement of pentagonal units as a structure building block with the formation of 6-member ring channel and 7-member ring channel in its crystal structure. The material showed an outstanding catalytic performance for both selective oxidations of ethane to ethene and of acrolein to acrylic acid, revealing the importance of these structures for the catalytic oxidation activity. The outstanding catalytic performance for the reactions is ascribed to octahedra clusters isolated in the pentagonal unit network and to microporous property of the 7-member ring channel.

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Metal oxide activities in the oxidation of ethylene

Cited by 40 publications

References 8 publications

The Historical Development of Catalytic Oxidation Processes

The Historical Development of Catalytic Oxidation Processes

Impacto dos catalisadores automotivos no controle da qualidade do ar

Establishment of Crystalline Complex Mo–V–Oxides as Selective Oxidation Catalysts

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