Investigation of the catalytic efficiency of a new mesoporous catalyst SnO2/WO3 towards oleic acid esterification

Саркар, Арпита; Ghosh, Sudip Kumar; Pramanik, Panchanan

doi:10.1016/j.molcata.2010.05.015

Cited by 58 publications

(17 citation statements)

References 33 publications

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“…These values correspond to that of Sn (IV) oxide. 52 The photoelectron peaks of W 4f 7/2 and W 4f 5/2 appeared at 35.9 and 37.9 eV which are identical to that of W (VI) oxide. 52 The XPS results revealed the existence of both WO 3 and SnO 2 in their simple oxide forms and that there was no formation of any mixed oxides.…”

Section: 4fmentioning

confidence: 87%

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Understanding the surface and structural characteristics of tungsten oxide supported on tin oxide catalysts for the conversion of glycerol

et al. 2015

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Catalysts with varying WO 3 content on SnO 2 were prepared and characterized by X-ray diffraction, in situ Raman spectroscopy, X-ray photoelectron spectroscopy and temperature programmed desorption of NH 3 . In situ Raman analysis reveals the presence isolated monomers and polymeric species of WO 3 . These catalysts were evaluated for the conversion of glycerol into value added chemicals. Etherification of glycerol with tertiary butanol and preparation of glycerol carbonate from glycerol and urea are studied over these catalysts. The catalytic activity results suggest that the glycerol conversion and selectivity depends on the morphology of WO 3 which in turn is related to its content in the catalyst. The catalysts with 5 wt.% of WO 3 on SnO 2 resulted in high dispersion with larger number of strong acidic sites. The selectivity in the glycerol etherification is related to the nature of the catalyst and reaction time. These catalysts also exhibited high activity for synthesis of glycerol carbonate. The effect of various reaction parameters was studied to optimize the reaction conditions. The catalysts also exhibited consistent activity upon reuse.

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Section: 4fmentioning

confidence: 87%

“…50 When the composition of the WO 3 in the catalyst was higher than 5 wt.%, the diffraction peaks of monoclinic WO 3 crystals were observed in the XRD patterns. 51,52 The crystallization of WO 3 was accompanied by a loss of specific surface area.…”

Section: 2bmentioning

confidence: 99%

Understanding the surface and structural characteristics of tungsten oxide supported on tin oxide catalysts for the conversion of glycerol

et al. 2015

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“…A comparison with sulfuric acid was performed which showed that SnO 2 /WO 3 catalyst was equally efficient in the reaction conditions studied (Figure 9) [30]. However, when the catalyst was used at lower concentration (i.e., 0.05 and 0.01% wt.…”

Section: Tin Catalyzed-esterification Reactionsmentioning

confidence: 99%

“…Sarkar and coworkers investigate the use of mesoporous catalysts based on SnO 2 /WO 3 and used the oleic acid esterification with ethyl alcohol as model reaction [30]. A comparison with sulfuric acid was performed which showed that SnO 2 /WO 3 catalyst was equally efficient in the reaction conditions studied (Figure 9) [30].…”

Section: Tin Catalyzed-esterification Reactionsmentioning

confidence: 99%

Heterogeneous Tin Catalysts Applied to the Esterification and Transesterification Reactions

Silva

Cardoso

2013

Journal of Catalysts

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The interest in the development of efficient and environmentally benign catalysts for esters synthesis has increased exponentially, mainly due to the demand for biodiesel. In general, fatty esters are used as bioadditive, cosmetic ingredients, polymers, and, more recently, biofuel. Nevertheless, most of the production processes use nonrecyclable and homogenous alkaline catalysts, which results in the reactors corrosion, large generation of effluents, and residues on the steps of separation and catalyst neutralization. Heterogeneous acid catalysts can answer these demands and are an environmentally benign alternative extensively explored. Remarkably, solid acid catalysts based on tin have been shown highly attractive for the biodiesel production, mainly via FFA esterification reactions. This review describes important features related to be the synthesis, stability to, and activity of heterogeneous tin catalysts in biodiesel production reactions.

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“…Alguns trabalhos avaliam o Sn como catalisador para reação de transesterificação na produção de biodiesel e de esterificação, levando a níveis de conversões variados conforme o composto sintetizado. Alguns atribuem o aumento proporcional da atividade catalítica à basicidade da superfície do catalisador de alguns óxidos [15], ou a acidez do SnO 2 sulfatado para esterificação de ácidos oleicos [16], outros atribuem melhores níveis de conversão ao trabalhar com suportes, como SnO 2 /WO 3 [17], SO 4 2-/SnO 2 -SnO 2 [18] e SO 4 2-/ZrO 2 [19]. Neste trabalho foram avaliados dois métodos de síntese para o sistema SnO 2 /argila, o método Pechini modificado e o método solvotermal assistido por micro-ondas, utilizando uma argila com predominância de montmorilonita, e em seguida avaliando também a aplicação dos catalisadores sintetizados para a reação de transesterificação na produção de biodiesel.…”

Section: Introductionunclassified

Avaliação de argilas pura e impregnada com SnO2 como catalisador para a produção de biodiesel

et al. 2015

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ResumoA versatilidade de materiais naturais como as argilas tem chamado a atenção para a sua aplicação em estudos científicos. Neste trabalho foi avaliado o enriquecimento dessas propriedades com a impregnação de SnO2 na superfície desse material, e seu comportamento como catalisador para a reação de transesterificação de óleo de soja. Para isso, uma bentonita foi selecionada, considerando os valores de capacidade de troca catiônica e teor de quartzo. A bentonita foi utilizada na forma pura e impregnada com SnO2 por dois métodos: solvotermal assistido por micro-ondas e Pechini modificado. Para avaliar a eficiência da impregnação, foram realizadas algumas caracterizações, como difração de raios X, adsorção de N2 e microscopia eletrônica de varredura, que mostraram uma melhor dispersão do SnO2no suporte utilizando o método Pechini modificado, o qual também apresentou melhor eficiência no teste catalítico para obtenção de biodiesel, reduzindo em 41,3% a viscosidade do óleo utilizado.

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Investigation of the catalytic efficiency of a new mesoporous catalyst SnO2/WO3 towards oleic acid esterification

Cited by 58 publications

References 33 publications

Understanding the surface and structural characteristics of tungsten oxide supported on tin oxide catalysts for the conversion of glycerol

Understanding the surface and structural characteristics of tungsten oxide supported on tin oxide catalysts for the conversion of glycerol

Heterogeneous Tin Catalysts Applied to the Esterification and Transesterification Reactions

Avaliação de argilas pura e impregnada com SnO2 como catalisador para a produção de biodiesel

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