New insights about the electro-oxidation of glycerol on platinum nanoparticles supported on multi-walled carbon nanotubes

Fernández, Pablo S.; Martins, M.E.; Câmara, Giuseppe A.

doi:10.1016/j.electacta.2012.01.069

Cited by 86 publications

(70 citation statements)

References 33 publications

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“…25 Therefore, in order to increase the efficiency of fuel utilization, active catalysts, having sufficient ability to break C-C bond in ethylene glycol, are strongly required. In fact, it is now consensual that glycerol suffers partial oxidation [26][27][28] generating glyceraldehyde, glycerate, mesoxalate, dihydroxyacetone and hydroxypyruvate, among other substances, leading to loss of energetic efficiency. It is difficult for Pd to break the C-C bond, 29,30 hence the need to dilute it with other metals (alloys) as co-catalysts 31,32 to promote the scission of C-C bonds.…”

Section: Introductionmentioning

confidence: 99%

Electro-oxidation of ethylene glycol and glycerol at palladium-decorated FeCo@Fe core–shell nanocatalysts for alkaline direct alcohol fuel cells: functionalized MWCNT supports and impact on product selectivity

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Electro-oxidation of ethylene glycol and glycerol at palladium-decorated FeCo@Fe core–shell nanocatalysts for alkaline direct alcohol fuel cells: functionalized MWCNT supports and impact on product selectivity

et al. 2015

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“…Uma hipótese é que esta banda pode ser atribuída à transição n → π * de ácidos carboxílicos, como ácido glicérico, fórmico, tartrônico, malônico ou ácido oxálico, espécies intermediárias ou produtos da oxidação eletroquímica da glicerina 29 presentes no efluente. Além disso, outra hipótese seria a formação de espécies como acroleína e ácido acrílico que, embora são produtos de oxidação da glicerina e também resultam no deslocamento batocrômico do tipo n → π * de ligação α,β-insaturada, são instáveis nas condições da eletrólise utilizadas e, segundo dados da literatura, ocorrem em torno de 340 nm.…”

Section: Tratamento Eletroquímico Do Efluente De Biodieselunclassified

TRATAMENTO ELETROQUÍMICO DE EFLUENTE DA PRODUÇÃO DE BIODIESEL USANDO UM ELETRODO DO TIPO ADE: Ti/IrO2-Nb2O5

et al. 2017

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5 . The anode was prepared by modified Pechini method and characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD), in order to evaluate structural and morphological properties and by electrochemical impedance spectroscopy, cyclic voltammetry and accelerated stability test to investigate the electrochemical behavior. The SEM image shows the typical mud-cracked layer. By the XRD measurements, the oxides onto the support were crystallized as tetragonal IrO 2 and hexagonal Nb 2 O 5 . The amount of glycerin and methanol in the wastewater were 1.60 and 0.31% (w/w), respectively. The electrochemical treatment of the wastewater was evaluated by electrolysis at different current densities and time. The total organic carbon (TOC) and UV-Vis spectra were performed during the electrolysis. The UV-Vis spectra obtained during the electrolysis at 100 and 150 mA cm -2 , shows the disappearance of an absorption band at 264 nm and the appearance of one at 290 nm, which the absorption increases as current and the time of the electrolysis increases. The electrochemical treatment with the proposed DSA leads to 80% of removal of TOC by electrolysis at 150 mA cm -2 during the first 6 hours of the electrochemical treatment.Keywords: biodiesel; wastewater; electrochemical treatment; DSA. INTRODUÇÃOO aumento da demanda por energia associado à limitação de fontes energéticas têm levado ao desenvolvido de estratégias para o uso de fontes alternativas de energia, como os biocombustíveis. Estudos têm mostrado que o uso de biocombustíveis reduz a emissão de gases tóxicos relacionados ao efeito estufa, como HCs, CO e CO 2 , particulados de matéria orgânica e óxidos sulfurosos responsáveis pela chuva ácida.1 O biodiesel é produzido a partir de óleos vegetais, gordura animal, óleos e gorduras residuais que, na presença de um catalisador ácido, básico ou enzimático, reage com álcool de cadeia curta, metanol ou etanol, resultando em ésteres de ácidos graxos de cadeia longa.2 Na produção industrial do biodiesel é necessário um excesso de álcool para promover maior rendimento na reação. 3O biodiesel é formado em um mecanismo reversível de três etapas consecutivas, onde o triglicerídeo é convertido a diglicerídeos, monoglicerídeos e glicerol, principal coproduto da obtenção do biodiesel, resultando em 3 mols de ésteres para cada 1 mol de triglicerídeo. 4 Nos últimos anos, o biodiesel tornou-se uma fonte de energia alternativa promissora mundialmente, sendo que os E.U.A. ocupam a 1 a posição no ranking mundial, com produção de 5.927.952 m 3 no ano 2016. O Brasil ocupa a 2ª posição neste ranking e, segundo dados da Agência Nacional de Petróleo, Gás Natural e Biocombustível (ANP), foram produzidos 3.801.339 m 3 de biodiesel no ano de 2016, sendo 1.646.828 m 3 de biodiesel somente na região do Centro-Oeste, a maior produtora do Brasil, com 43,3% do total produzido. 5 Atualmente, a legislação brasileira determina a mistura compulsória de 8% em volume de biodiesel ao óleo diesel rodoviário, formando o que se denomina a mistura B8, ...

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“…It is also a unique source of chemicals for several important industrial sectors. Studies on glycerol electrochemical oxidation have focused on the use of noble metals as electrocatalysts [1][2][3][4][5][6][7][8][9][10][11]. The use of binary or ternary intermetallic materials can further enhance alcohol electrooxidation as a result of (1) bifunctional action, (2) variation in the electronic state of the adsorption site, (3) third-body effect, or (4) a combination of such effects.…”

Section: Introductionmentioning

confidence: 98%

Ordered Intermetallic Nanostructured PtSb/C for Production of Energy and Chemicals

Scachetti

Angelo

2015

Electrocatalysis

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This paper has evaluated ordered intermetallic nanostructured PtSb/C as anode for glycerol electrochemical oxidation in both acidic and alkaline media. Nanostructured PtSb/C performed as well as and 50 % better than commercially available Pt/C nanoparticles in acidic and basic media, respectively. The presence of Sb atoms in the material structure enhanced C-C bond cleavage activation in alkaline medium. Spectroelectrochemical studies confirmed that the reactions conducted in acidic and alkaline solutions produced high-value chemicals. Depending on the nature of the employed electrolyte, the nanostructured PtSb/C material can potentially afford interesting compounds for the chemical industry or even generate electrical energy.

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New insights about the electro-oxidation of glycerol on platinum nanoparticles supported on multi-walled carbon nanotubes

Cited by 86 publications

References 33 publications

Electro-oxidation of ethylene glycol and glycerol at palladium-decorated FeCo@Fe core–shell nanocatalysts for alkaline direct alcohol fuel cells: functionalized MWCNT supports and impact on product selectivity

Electro-oxidation of ethylene glycol and glycerol at palladium-decorated FeCo@Fe core–shell nanocatalysts for alkaline direct alcohol fuel cells: functionalized MWCNT supports and impact on product selectivity

TRATAMENTO ELETROQUÍMICO DE EFLUENTE DA PRODUÇÃO DE BIODIESEL USANDO UM ELETRODO DO TIPO ADE: Ti/IrO2-Nb2O5

Ordered Intermetallic Nanostructured PtSb/C for Production of Energy and Chemicals

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