Catalytic oxidation of VOCs on MnMgAlOx mixed oxides obtained by auto-combustion

Castaño, María Haidy; Molina, Rafael; Moreno, Sonia

doi:10.1016/j.molcata.2015.01.001

Cited by 39 publications

(25 citation statements)

References 49 publications

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“…84,97,101,[184][185][186][187][188][189][190][191][192][193][194][195] Manganese oxide based catalysts are perhaps the most interesting from a commercial perspective, attributable to their low synthesis costs and high activity. 134,196 MnO2 has been reported to be even more active than some NMSCs for this reaction. 197 As with some of the other VOCs discussed previously, the high activity of the manganese oxide catalysts for this reaction is attributed to the co-existence of mixed valence states of Mn 2+ /Mn 3+ or Mn 3+ /Mn 4+ and lattice oxygen.…”

Section: N-hexanementioning

confidence: 97%

Recent Advances in the Catalytic Oxidation of Volatile Organic Compounds: A Review Based on Pollutant Sorts and Sources

et al. 2019

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Section: N-hexanementioning

confidence: 97%

Recent Advances in the Catalytic Oxidation of Volatile Organic Compounds: A Review Based on Pollutant Sorts and Sources

et al. 2019

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“…For the catalytic combustion of CH 4 in lean conditions many different catalysts have been studied so far, ranging from noble metals, mainly Pd and/or Pt supported on oxides or mixed oxides [12][13][14][15], to perovskites [16][17][18], and non-noble oxides [19,20]. In particular, among non-noble oxides in recent years cobalt oxides attracted great attention thanks to their catalytic properties, useful in many different applications, for example as magnetic materials [21,22], electrochemical devices [23,24], and various catalytic systems [25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Preparation Method of Pd-Doped Cobalt Spinel on the Catalytic Activity in Methane Oxidation Under Lean Fuel Conditions

et al. 2016

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In this work a series of cobalt spinel catalysts was synthesized by different methods and doped with 1 wt% of palladium via incipient wetness impregnation or solution combustion synthesis (SCS). Both undoped and Pd-doped spinels were characterized from the structural and surface point of view (XRD, XRF, lRS, BET, FESEM) and tested toward the oxidation of methane in lean conditions, in gas mixtures containing from 0.5 to 2 vol% of CH 4 . These methane concentrations are typical of processes involving combustion of CH 4 in lean conditions as the after-treatment of unconverted CH 4 in compressed natural gas-fed vehicle exhausts, or the treatment of fugitive CH 4 from leaks in coal mines. The temperature window for the catalytic activity of the undoped Co 3 O 4 materials spread from 350 to 600°C. The preparation method affected the catalytic activity of undoped Co 3 O 4 , with the best catalytic activity related to the spinel prepared by SCS employing urea. The addition of 1 wt% of Pd lowered the temperature window for the catalytic activity to the range of 250-500°C, with insignificant differences for the various preparation methods. The beneficial effect of Pd-doping was assigned to the enhancement of the reduction of cobalt in the oxide structure.

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“…A característica de bandas mais largas observada nos espectros dos catalisadores de Cu e Co indica que estas amostras possuem uma ampla distribuição de tipos de cátions metálicos e de estados de oxidação dos mesmos, distribuídos tanto em sítios tetraédricos quanto octaédricos [11][12][13][14][15][16][17][18].…”

Section: Resultsunclassified

“…A proporção de cada reagente obedeceu aos conceitos da química dos propelentes e foi calculada de acordo com razão entre a valência total da ureia e a valência total dos nitratos (Equação 1) [17]: A razão estequiométrica combustível/oxidante usada foi igual a 0,5. A massa dos reagentes necessária foi misturada e dissolvida em 20 mL de água deionizada e colocada sob aquecimento e agitação constantes.…”

Section: Síntese Dos Catalisadoresunclassified

Síntese de óxidos mistos AMn2O4 (A=Co, Cu e Ni) preparados por autocombustão para controle de emissões de compostos orgânicos voláteis

et al. 2019

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RESUMO Os compostos orgânicos voláteis (COVs) são substâncias que possuem elevada pressão de vapor e baixa solubilidade em água e são reconhecidos por serem um dos maiores responsáveis pela poluição atmosférica, tanto por sua natureza tóxica quanto por serem os precursores do ozônio e do smog fotoquímico. O objetivo deste trabalho foi sintetizar óxidos mistos sob as mesmas condições de preparação e avaliar suas propriedades e atividade, visando a obtenção de catalisadores eficientes do ponto de vista ambiental naoxidação do tolueno, que constitui um dos COVs mais abundantes na atmosfera. Óxidos com estrutura de espinélio AMn2O4 (A=Co, Cu e Ni) foram preparados pelo método de autocombustão sob as mesmas condições de síntese e suas propriedades físico químicas foram avaliadas por DRX, BET, FTIR e MEV. A relação entre as propriedades a as atividades dos espinélios na oxidação do tolueno foi avaliada e os catalisadores de Cu e Co foram os mais promissores, com conversões de 99 e 92%, respectivamente. Esta maior atividade foi atribuída ao possível efeito sinérgico entre o Mn3+ e as fases Co2+ e Cu2+ presentes nas estruturas dos óxidos. Não foi verificada relação direta entre os resultados obtidos para a atividade e área específica.

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Catalytic oxidation of VOCs on MnMgAlOx mixed oxides obtained by auto-combustion

Cited by 39 publications

References 49 publications

Recent Advances in the Catalytic Oxidation of Volatile Organic Compounds: A Review Based on Pollutant Sorts and Sources

Recent Advances in the Catalytic Oxidation of Volatile Organic Compounds: A Review Based on Pollutant Sorts and Sources

The Effect of the Preparation Method of Pd-Doped Cobalt Spinel on the Catalytic Activity in Methane Oxidation Under Lean Fuel Conditions

Síntese de óxidos mistos AMn2O4 (A=Co, Cu e Ni) preparados por autocombustão para controle de emissões de compostos orgânicos voláteis

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