Insights into SO2 Interaction with Pd/Co3O4–CeO2 Catalysts for Methane Oxidation

Liotta, Leonarda Francesca; Carlo, Gabriella Di; Pantaleo, G.; Venezia, Anna Maria; Deganello, G.

doi:10.1007/s11244-009-9375-1

Cited by 37 publications

(54 citation statements)

References 20 publications

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“…Figure 5 illustrates the experimental XPS spectra of the Co 2p3/2, O 1s, and S 2p regions for fresh Co1.0Ce and Co1.0Ce-S40h. The Co 2p3/2 peak binding energy (BE) for Co1.0Ce appeared at 781.2 eV, in agreement with the reference data [13,14,21]. There was no change in the BE for Co 2p3/2 of Co1.0Ce-S-40h, which was observed at 781.1 eV.…”

Section: Characterization Analysissupporting

confidence: 87%

“…A long exposure time to SO2 + O2 showed no effect on the electronic state of the cobalt according to the XPS results. Liotta et al [21] also found that the Co 2p spectrum did not change upon sulfur poisoning when they studied the SO2 effect on Pd/Co3O4 catalysts for CH4 oxidation. This suggested that Co3O4·SO3 was the dominant sulfate formed on Co3O4 [21].…”

Section: Discussionmentioning

confidence: 97%

“…Liotta et al [21] also found that the Co 2p spectrum did not change upon sulfur poisoning when they studied the SO2 effect on Pd/Co3O4 catalysts for CH4 oxidation. This suggested that Co3O4·SO3 was the dominant sulfate formed on Co3O4 [21]. The double peak in the TPO profile of Co1.0Ce-S-40h can be attributed to the activity of Co3O4 in the catalyst.…”

Section: Discussionmentioning

confidence: 97%

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Effect of sulfur poisoning on Co3O4/CeO2 composite oxide catalyst for soot combustion

Shi

2014

Chinese Journal of Catalysis

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Section: Characterization Analysissupporting

confidence: 87%

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

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Effect of sulfur poisoning on Co3O4/CeO2 composite oxide catalyst for soot combustion

Shi

2014

Chinese Journal of Catalysis

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“…9 Recent works have demonstrated that the addition of ceria to cobaltic oxide allows cocatalyst production, with better performances with respect to pure Co 3 O 4 in terms of higher thermal stability and catalytic activity. [10][11][12][13][14][15] Ceria-based electrolytes are the most promising alternative to yttria-stabilized zirconia as a fast ionic conductor for solid oxide fuel cells, with the advantage of a lower operating temperature. [16][17][18] In recent years the increased interest in these materials has lead to many investigations aimed at studying efficient processes for the fabrication of ceria powders as well as to improve their sinterability.…”

mentioning

confidence: 99%

Electrosynthesis of Ce–Co Mixed Oxide Nanotubes with High Aspect Ratio and Tunable Composition

Bocchetta

Santamaria

Quarto

2008

Electrochem. Solid-State Lett.

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An electrochemical synthetic route is developed to produce cerium-cobalt mixed oxide nanotubes with tunable composition. The process consists of a template-assisted electrogeneration of base from a cerium-cobalt nitrate solution of different compositions. From scanning electron microscopy studies it is seen that Ce-Co oxide nanotubes of high aspect ratio and ordered structures are formed. Energy-dispersive X-ray analysis shows a linear relationship between the solution and the oxide composition ͓Ce/͑Ce + Co͒ atomic ratio͔. © 2008 The Electrochemical Society. ͓DOI: 10.1149/1.2823260͔ All rights reserved. Cerium oxide and cobalt oxides have attracted the interest of several researchers due to their potential application in several technological fields ͑electrochromism, lithium batteries, catalysis, etc.͒. Ceria has been used as a promoter in the so-called "three-way catalyst" for the control of toxic emission from automobile exhaust. The promotion consists of the enhancement of the noble metal dispersion, as well as stabilization of the supporting medium toward thermal sintering.1,2 A direct catalytic effect of CeO 2 in chemical processes such as water-gas shift reaction or NO x decomposition has been also evidenced.3,4 Concerning Co 3 O 4 , several papers have reported on its beneficial role in the oxidation of carbon monoxide [5][6][7][8] and methane.9 Recent works have demonstrated that the addition of ceria to cobaltic oxide allows cocatalyst production, with better performances with respect to pure Co 3 O 4 in terms of higher thermal stability and catalytic activity.10-15 Ceria-based electrolytes are the most promising alternative to yttria-stabilized zirconia as a fast ionic conductor for solid oxide fuel cells, with the advantage of a lower operating temperature. [16][17][18] In recent years the increased interest in these materials has lead to many investigations aimed at studying efficient processes for the fabrication of ceria powders as well as to improve their sinterability. According to Ref. 19 and 20, the addition of a small amount of cobalt oxide to gadolinia-stabilized ceria resulted in much lower sintering temperature, higher shrinkage rates, and grain sizes in the final sintered product in the submicrometer range.If we consider that the activity of catalysts can be enhanced by a high surface area to bulk ratio, the possibility of finding a process for the fabrication of cerium-cobalt mixed oxides with smart morphologies, such as one-dimensional ͑1D͒ nanostructures, seems appealing and challenging.In recent years cerium oxide and cobalt oxide nanowires have been produced through several methods, such as a template-assisted sol-gel process, nonisothermal precipitation, spontaneous selfassembly of cerium oxide nanoparticles to nanorods, and a solutionbased hydrothermal process.21 However, only a few studies have addressed the fabrication of Co or Ce oxide nanostructures with hollow interiors, usually called nanotubes ͑NTs͒, [22][23][24][25][26] and as far as the authors know, no data are reported in...

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“…130 Outros estudos mostraram o potencial de catalisadores de platina suportados em óxidos mistos de cério e zircônio na reforma autotérmica do isooctano, na conversão de monóxido a dióxido de carbono a altas temperaturas e na remoção de óxidos de nitrogênio dos gases de exaustão automotivos.…”

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Nanotecnologia: aspectos gerais e potencial de aplicação em catálise

Ferreira¹,

Rangel²

2009

Quím. Nova

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Recebido em 14/4/08; aceito em 18/2/09; publicado na web em 4/8/09 NANOTECHNOLOGY: GENERAL ASPECTS AND POTENTIAL APPLICATIONS IN CATALYSIS. In recent years nanomaterials, such as metallic nanoparticles, nanowires, nanotapes, nanotubes and nanocomposites, have attracted increasing interest for several technological applications. In catalysis, the great potential of nanomaterials is related to the high catalytic activity exhibited by these materials as a function of the high surface/volume ratio when the particles acquire diameter below 5 nm. In this work, a review about concepts and background of nanoscience and nanotechnology is presented with emphasis in catalysis. Special attention is given to gold nanoparticles and carbon nanotubes, focusing the properties and characteristics of these materials in several catalytic reactions.Keywords: nanocatalysts; gold nanoparticles; carbon nanotubes. INTRODUÇÃOA ciência e tecnologia em nanoescala têm atraído considerável atenção nos últimos anos, pela expectativa do impacto que os materiais nanoestruturados podem causar na melhoria da qualidade de vida e na preservação do meio ambiente. Espera-se que o avanço da nanociência e da nanotecnologia estimule não apenas a exploração de novos fenômenos e novas teorias, mas também conduza a uma revolução industrial, se tornando a nova força motora do crescimento econômico neste século. 1A pesquisa e o desenvolvimento, em nanotecnologia, visam a manipular estruturas em nanoescala e integrá-las para formar componentes e sistemas maiores. As possibilidades são quase infinitas e se prevê que a nanotecnologia exerça um efeito mais profundo, na sociedade do futuro, que o impacto causado pelos automóveis, aviões, televisões e computadores no século XX. Espera-se que muitos dos importantes impactos devam vir do aumento das velocidades das reações, através do uso de nanocatalisadores e da integração da eletrônica molecular com a tecnologia avançada do silício. Espera-se que a nanotecnologia possa proporcionar a geração de novos produtos e novas oportunidades de mercado, através da integração da ciência e tecnologia. A maioria das indústrias atuais irá se beneficiar com as inovações da nanotecnologia. As colaborações e interações entre indústria, academia e instituições governamentais, em escala mundial, irão acelerar o desenvolvimento de novos produtos. O tradicional modelo de negócio de larga escala deverá ser revisto de modo a considerar o elevado valor agregado dos nanomateriais e o valor social deverá incluir um menor impacto ambiental na manufatura dos produtos.5 Os processos deverão ser mais limpos e com maior eficiência no uso da energia e, possivelmente, de novas fontes renováveis. O consumidor irá se beneficiar pela diversidade de produtos baseados na nanotecnologia, que irão melhorar a qualidade de vida das pessoas em todo o mundo.Alguns produtos em nanoescala já estão sendo comercializados, tais como dióxido de titânio, ouro, prata e cobre que, adicionados aos plásticos, tintas e outros materiais, melhoraram o seu desempenho. Ou...

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Insights into SO2 Interaction with Pd/Co3O4–CeO2 Catalysts for Methane Oxidation

Cited by 37 publications

References 20 publications

Effect of sulfur poisoning on Co3O4/CeO2 composite oxide catalyst for soot combustion

Effect of sulfur poisoning on Co3O4/CeO2 composite oxide catalyst for soot combustion

Electrosynthesis of Ce–Co Mixed Oxide Nanotubes with High Aspect Ratio and Tunable Composition

Nanotecnologia: aspectos gerais e potencial de aplicação em catálise

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