New mechanistic approaches for fatty acid methyl ester production reactions in the presence of Sn(IV) catalysts

Nunes, Rafael Saraiva; Altino, Felyppe M.; Meneghetti, Mário R.; Meneghetti, Simoni Margareti Plentz

doi:10.1016/j.cattod.2016.09.016

Cited by 12 publications

(9 citation statements)

References 16 publications

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“…9,10 For example, organotin nanoclusters can function as catalytic supports 1,11 or as catalysts for transesterification and esterification reactions. 2,3 Organotin materials have been shown to exhibit both antiviral and anticancer activity mainly because of their ability to interact with DNA. 6−8 Organotin nanoclusters can be synthesized with precise atomic-scale control, where manipulation of size, shape, or structure allows for a range of chemical compositions and properties.…”

Section: ■ Introductionmentioning

confidence: 99%

Ambient-Pressure X-ray Photoelectron Spectroscopy Characterization of Radiation-Induced Chemistries of Organotin Clusters

Diulus

Frederick

et al. 2018

ACS Appl. Mater. Interfaces

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Advances in extreme ultraviolet (EUV) photolithography require the development of next-generation resists that allow high-volume nanomanufacturing with a single nanometer patterning resolution. Organotin-based photoresists have demonstrated nanopatterning with high resolution, high sensitivity, and low-line edge roughness. However, very little is known regarding the detailed reaction mechanisms that lead to radiation-induced solubility transitions. In this study, we investigate the interaction of soft Xray radiation with organotin clusters to better understand radiation-induced chemistries associated with EUV lithography. Butyltin Keggin clusters (β-NaSn 13 ) were used as a model organotin photoresist, and characterization was performed using ambient-pressure X-ray photoelectron spectroscopy. The changes in relative atomic concentrations and associated chemical states in β-NaSn 13 resists were evaluated after exposure to radiation for a range of ambient conditions and photon energies. A significant reduction in the C 1s signal versus exposure time was observed, which corresponds to the radiation-induced homolytic cleavage of the butyltin bond in the β-NaSn 13 clusters. To improve the resist sensitivity, we evaluated the effect of oxygen partial pressure during radiation exposures. We found that both photon energy and oxygen partial pressure had a strong influence on the butyl group desorption rate. These studies advance the understanding of radiation-induced processes in β-NaSn 13 photoresists and provide mechanistic insights for EUV photolithography.

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Section: ■ Introductionmentioning

confidence: 99%

Ambient-Pressure X-ray Photoelectron Spectroscopy Characterization of Radiation-Induced Chemistries of Organotin Clusters

Diulus

Frederick

et al. 2018

ACS Appl. Mater. Interfaces

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“…Dentre eles, alguns trabalhos realizam a investigação de catalisadores a base de Sn(IV) para a metanólise do óleo de soja e a esterificação do ácido oleico com metanol, os quais exibem elevadas atividades, sendo estas maiores do que os catalisadores inorgânicos clássicos. Além disso, esses sistemas proporcionam uma redução nas etapas de neutralização e purificação dos produtos, aspectos relevantes que contribuem para a diminuição dos impactos ambientais e dos custos do processo (NUNES et al, 2017;SILVA et al, 2015;BRITO et al, 2012). Assim, ao longo dos anos é expressivo o desenvolvimento de calisadores empregados nas reações de esterificação e transesterificação, pois proporciona condições mais favoráveis e estão alinhados aos príncipios da química verde.…”

Section: Metodologiaunclassified

“…Figura 11 -Número de patentes em relação ao ano de deposição Fonte: Elaborada pelos autores deste (2018) Ao avaliar o Brasil nesse cenário, existem muitos trabalhos científicos sobre essa temática, principalmente no desenvolvimento de sistemas catalíticos bifuncionais, os quais atuam simultaneamente nas reações de esterificação e transesterificação, tais como: tricloreto de butilestanho, dicloreto de dibutilestanho, fostato de nióbio, zircônia sulfatada, inclusive através de processo catalítico enzimáticos empregando lipases comerciais (Novozym 435, Lipozyme RM IM e Lipozyme TL IM) (NUNES et al, 2017;ALESSIO et al, 2017;RAIA et al, 2017;PEDRO et al, 2018).…”

Section: Metodologiaunclassified

Prospecção Tecnológica de Catalisadores Empregados em Reações de Transesterificação e Esterificação

Brainer

Vieira

et al. 2019

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O desenvolvimento de novos materiais é crescente ao longo das décadas, tendo como destaque os catalisadores, os quais exercem papel importante nos processos industriais atuando em reações como de transesterificação e esterificação na produção de diversos compostos, a exemplo, os biocombustíveis. Neste trabalho realizou-se o levantamento prospectivo tecnológico de catalisadores utilizados em reações de transesterificação e esterificação. A execução das buscas de patentes e artigos ocorreu em diferentes bases de dados utilizando-se as palavras-chave catalyst AND transesterification AND esterification. Essa temática tem atraído atenção no meio industrial e acadêmico como observado no Scopus, com o número de publicações de 719 documentos, com os países líderes China e Índia; e no quesito número de patentes depositadas conforme o Patent Inspiration,de 216, destacando-se os Estados Unidos e Japão. O Brasil apresenta crescente interesse nesse cenário por meio do desenvolvimento e aperfeiçoamento de catalisadores.

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“…The gradual depletion of the traditional fossil fuels increases the environmental pollution and global warming, so more and more attention is being paid to develop renewable fuels (e.g., biodiesel and biofuel). 1,2 Biodiesel production from plant oils, 3 animal fats, 4 waste cooking oils, 5,6 or free fatty acids (FFAs) 7 is regarded as a renewable green fuel owing to its clean, nontoxic, lower emissions of carbon monoxide, and carbon-neutral characteristics. On the other hand, it has similar physicochemical properties to conventional fossil diesel, such as comparable lubricity and flash point cetane value, and could be directly applied in engine without significant engine modifications.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Ferric-Modified Phosphomolybdic Acid Composite Catalysts for Biodiesel Production with Response Surface Optimization

Zhang

Yue

et al. 2019

ACS Omega

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An attempt has been made to optimize the preparation of biodiesel from the transesterification of oleic acid with methanol over iron(III)-doped phosphomolybdic acid (H 3 PMo) catalysts. The prepared doped H 3 PMo salts were characterized using powder X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. The detailed characterization results demonstrated that the doped H 3 PMo salts have a strong interaction between the iron(III) ions and metal oxygen cluster, well preserving a typical Keggin structure of heteropolyacids and possessing good thermal stability. The effect of esterification reaction parameters was investigated and optimized using single-factor experiments method in combination with response surface methodology (RSM). The doped catalyst exhibited good catalytic activity, affording the oleic acid conversion of 89.2% with single factor optimization and 95.1% with RSM. More importantly, the catalyst was simply separated by decantation and exhibited good stability, with the oleic acid conversion of 70.2% after three consecutive cycles. Besides, this catalyst can also catalyze the esterification of other free fatty acids. Therefore, the doped H 3 PMo catalyst is a promising candidate for eco-friendly production of biodiesel in industry.

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New mechanistic approaches for fatty acid methyl ester production reactions in the presence of Sn(IV) catalysts

Cited by 12 publications

References 16 publications

Ambient-Pressure X-ray Photoelectron Spectroscopy Characterization of Radiation-Induced Chemistries of Organotin Clusters

Ambient-Pressure X-ray Photoelectron Spectroscopy Characterization of Radiation-Induced Chemistries of Organotin Clusters

Prospecção Tecnológica de Catalisadores Empregados em Reações de Transesterificação e Esterificação

Facile Synthesis of Ferric-Modified Phosphomolybdic Acid Composite Catalysts for Biodiesel Production with Response Surface Optimization

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