Decomposição catalítica de óleo de soja em presença de diferentes zeólitas

Santos, Frances R. dos; Ferreira, José Carlos Netto; Costa, Stella Regina Reis da

doi:10.1590/s0100-40421998000500005

Cited by 19 publications

(15 citation statements)

References 7 publications

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“…The results show that all solids are active for the methanolysis reaction (see entries [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Nonetheless, the most active catalyst using comparable conditions is the Nb 2 O 5 /H 3 PO 4 .…”

Section: Transesterification Resultsmentioning

confidence: 99%

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Synthesis, characterization and use of Nb2O5 based catalysts in producing biofuels by transesterification, esterification and pyrolysis

Brandão¹,

Quirino²,

Mello³

et al. 2009

J. Braz. Chem. Soc.

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2 O have been investigated as catalysts for the transesterification, esterification and pyrolysis of vegetable oils. The compounds were characterized by thermal analysis (DTA-TGA), spectroscopy (DRX, FT-IR and FT-Raman), surface area (BET) and the acidity (Ho) determined by n-butylamine titration using the Hammet´s indicator method. It was observed that after the acid treatment both the surface area and the acidity decreased as compared to the starting Nb 2 O 5 •xH 2 O. The only exception was a higher acidity verified when nitric acid was used. Among the catalyst investigated, the Nb 2 O 5 /H 3 PO 4 presented the highest activity in the alcoholysis of soybean oil with different mono-alcohols (methanol, ethanol, 2-propanol, n-butanol

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Section: Transesterification Resultsmentioning

confidence: 99%

“…For example, it has been reported the production of hydrocarbons from Tung oil in China during the Second World War. 11 Since then, numerous studies about the thermal [12][13][14][15][16][17][18] and catalytic [19][20][21][22][23][24][25][26][27][28][29] pyrolysis of triglycerides and Vol. 20, No.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and use of Nb2O5 based catalysts in producing biofuels by transesterification, esterification and pyrolysis

Brandão¹,

Quirino²,

Mello³

et al. 2009

J. Braz. Chem. Soc.

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“…However, it remains that some supports modified by impregnation with phosphoric acid are very efficient in promoting the thermocatalytic decomposition of vegetable oils towards saturated linear hydrocarbons, very similar to diesel components. Studies using different types of zeolites were performed by Santos et al 31 In this case, the proposed objective was to obtain branched hydrocarbons isomers and aromatics able to upgrade some properties of gasoline. 28 The oil feed studied was a commercial soybean oil and the catalytic transformations were performed between 400 and 500 ºC.…”

Section: Thermo-catalytic Decomposition Of Triglyceridesmentioning

confidence: 99%

“…Guerra et al 32 studied the thermal decomposition of andiroba oil, Carapa guianensis in conditions comparable to those used by Santos et al 31 They used as solid catalysts a natural smectite-bearing clay from Pará State modified by pillaring with Al, Ti and Zr species. They observed a good correlation between certain physical and chemical properties of their catalysts and the ratio H aromatics /H aliphatics in the C5-C12 fraction obtained from the cracking of andiroba oil.…”

Section: Thermo-catalytic Decomposition Of Triglyceridesmentioning

confidence: 99%

Cracking and hydrocracking of triglycerides for renewable liquid fuels: alternative processes to transesterification

Fréty¹,

Rocha²,

Brandão³

et al. 2011

J. Braz. Chem. Soc.

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Os processos industriais mais utilizados na produção de combustíveis líquidos semelhantes ao diesel usam catalisadores homogêneos básicos através das metanólise e etanólise de óleos tais como os de soja, canola, palma entre outros. Desse modo, se obtém o biodiesel. Por sua vez, transformações termo-catalíticas usando as facilidades existentes nas refinarias de petróleo são alternativas que merecem atenção devido a sua viabilidade econômica. De fato, três processos industriais já estão em funcionamento e novos projetos estão em fase final para comercialização. O presente trabalho analisa os experimentos já realizados por pesquisadores brasileiros nas áreas do craqueamento, do craqueamento catalítico e do hidrocraqueamento catalítico dos óleos vegetais puros ou modificados. A partir dos resultados descritos, são sugeridas novas direções destas pesquisas para os próximos anos.The most used industrial processes for the production of liquid fuels like diesel type are based on the methanolysis and ethanolysis of various oil reactants, such as palm, soybean and rapeseed oils, in the presence of homogeneous base catalysts. However, thermal and catalytic transformations of vegetable oils using available reactors and industrial processes are possible alternatives and deserve attention. In fact, three industrial processes are operating and new projects are announced. The present work analyses the experimental studies performed up to now by Brazilian researchers in the field of cracking, catalytic cracking and hydrocracking of pure or modified vegetable oils. From the published results, some research areas for the near future are suggested.

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“…Por outro lado, a estratégia do uso de catalisadores heterogêneos vem demonstrando que catalisadores sólidos que apresentam acidez de Lewis, como aluminossilicatos e óxidos, são eficientes para promover a desoxigenação dos produtos, sendo a seletividade dos produtos dependente da natureza do sólido utilizado. Por exemplo, a desoxigenação dos produtos da decomposição térmica de óleo de soja é favorecida quando a reação é realizada na presença de diferentes zeólitas, [58][59][60] sendo também observado que reações de craqueamento da cadeia dos hidrocarbonetos formados, ciclizações e aromatização levam à formação de um produto próximo à faixa da gasolina (8-10 carbonos). Já aluminossilicatos não estruturados e (γ-alumina) 61,62 são também eficientes na desoxigenação dos produtos formados, diminuindo as reações de craqueamento da cadeia carbônica e de ciclização e aromatização, gerando um biocombustível com perfil de destilação próximo ao do diesel.…”

Section: Processos De Obtenção De Hidrocarbonetos: Bio-óleounclassified

Biocombustíveis a partir de óleos e gorduras: desafios tecnológicos para viabilizá-los

Suarez¹,

Santos²,

Rodrigues³

et al. 2009

Quím. Nova

112

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BiocomBustíveis a partir de óleos e gorduras: desafios tecnológicos para viaBilizá-los paulo a. z. suarez*, andré l. f. santos, Juliana p. rodrigues e melquizedeque B. alves Instituto de Química, Universidade de Brasília, CP 4478, Brasil Recebido em 28/1/09; aceito em 3/3/09; publicado na web em 17/3/09 OILS AND FATS BASED BIOFUELS: TECHNOLOGICAL CHALENDGES. Periodically, during petroleum shortage, fatty acids and their derivatives have been used as alternative fuels to those derived from petroleum. Different approaches have been proposed, including the use of neat fats and oils or their derivatives. Indeed, the utilization of biodiesel produced by alcoholysis of triacilglycerides or esterification of fatty acids, or hydrocarbons obtained from cracking of fatty materials were studied and used in several countries. Increasing concerns about energy security and climate changes have lead several countries, including Brazil, to start up biofuels programs. Different technologies are currently being developed in order to produce biofuels with economical feasibility. In this work are discussed alternative fatty raw-materials and processing technologies that are currently being studied in order to produce fuels suitable to sustainable substitute diesel fuel.

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Decomposição catalítica de óleo de soja em presença de diferentes zeólitas

Cited by 19 publications

References 7 publications

Synthesis, characterization and use of Nb2O5 based catalysts in producing biofuels by transesterification, esterification and pyrolysis

Synthesis, characterization and use of Nb2O5 based catalysts in producing biofuels by transesterification, esterification and pyrolysis

Cracking and hydrocracking of triglycerides for renewable liquid fuels: alternative processes to transesterification

Biocombustíveis a partir de óleos e gorduras: desafios tecnológicos para viabilizá-los

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