Optimization of esterification reaction over niobium phosphate in a packed bed tubular reactor

Rade, Letícia Leandro; Lemos, Caroline Ortega Terra; Barrozo, Marcos Antônio de Souza; Ribas, Rogério M.; Monteiro, Robson S.; Hori, Carla Eponina

doi:10.1016/j.renene.2018.07.041

Cited by 24 publications

(5 citation statements)

References 15 publications

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“…The effect of calcination temperature on niobium phosphate properties and catalytic performances was evaluated by Rade et al (2019). Samples of commercial niobium phosphate were calcined at different temperatures (300, 350, 400, 450, 500, and 600 °C), characterized, and tested for esterification of oleic acid with ethanol in a continuous rector.…”

Section: Biodieselmentioning

confidence: 99%

“…However, it can be affirmed that niobium phosphate is thermally stable, mainly when compared to niobic acid, since its surface area and acidity have decreased considerably only after calcination at 600 °C. The catalyst prepared by calcination at 300 °C presented the best performance for esterification (250 °C, ethanol:oleic acid molar ratio of 6:1, 0.3 g of catalyst, and flow rate of 0.3 mL/min) due to its greater surface area, and higher acidity and thermal stability (Rade et al, 2019).…”

Section: Biodieselmentioning

confidence: 99%

See 1 more Smart Citation

Uso de compostos de nióbio como catalisadores na produção de biocombustíveis: uma revisão

Moreira¹,

Souza²,

Silva³

et al. 2022

J. Eng. Exact Sci.

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A necessidade de substituir combustíveis fósseis por biocombustíveis não é um tema recente na comunidade acadêmica. Pesquisadores estudam e desenvolvem combustíveis alternativos há décadas e, com isso, combustíveis como o biodiesel e o etanol de primeira geração se consolidaram no mercado. No entanto, esses biocombustíveis de primeira geração competem com a indústria de alimentos, o que afeta sua oferta e preço. Por outro lado, os combustíveis de segunda geração são produzidos a partir de biomassa lignocelulósica e resíduos orgânicos de atividades urbanas e agroindustriais, não competindo com a indústria de alimentos. No entanto, a maioria desses processos ainda não é economicamente viável. Duas das principais contribuições para essa inviabilidade são o baixo desempenho dos processos (baixa conversão da matéria-prima e baixa seletividade dos produtos de interesse) e o alto custo dos catalisadores, que muitas vezes são feitos de metais nobres de pouca disponibilidade. O Nióbio é um metal com diversas aplicações, mas ainda pouco explorado industrialmente como catalisador, apesar de possuir propriedades interessantes para essa finalidade. Este artigo de revisão compila trabalhos envolvendo o uso do nióbio e seus compostos como catalisador em diversos processos de produção de biocombustíveis, como esterificação, pirólise, liquefação, síntese Fischer-Tropsch, desoxigenação, entre outros. Além da revisão da literatura, este artigo apresenta uma análise crítica a respeito das aplicações de cada processo e tecnologia, bem como das pesquisas desenvolvidas pelos autores.

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Section: Biodieselmentioning

confidence: 99%

Section: Biodieselmentioning

confidence: 99%

Uso de compostos de nióbio como catalisadores na produção de biocombustíveis: uma revisão

Moreira¹,

Souza²,

Silva³

et al. 2022

J. Eng. Exact Sci.

View full text Add to dashboard Cite

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“…Temperature, besides feed flow rate, is the most important decisive variable in flow (bio)reactors [15,[50][51][52][53][54]. It has a crucial impact on enzyme activity, its stability, and in consequence on bioreactor performance [6].…”

Section: Optimization Problem Formulationmentioning

confidence: 99%

Analytical Determination of the Optimal Feed Temperature for Hydrogen Peroxide Decomposition Process Occurring in Bioreactor with a Fixed-Bed of Commercial Catalase

Grubecki

2020

Catalysts

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The hydrogen peroxide-immobilized commercial catalase system was chosen to estimate the optimal feed temperature (OFT) for fixed-bed reactor (FXBR). This feed temperature was obtained based on analytical solution by maximizing the time-averaged substrate conversion under a constant feed flow rate and temperature constraints. In calculations a set of partial differential equations describing the conservation equation for fixed-bed reactor, assuming plug flow and kinetic equation for the rate of enzyme parallel deactivation was taken into account. The model is based on kinetic, and mass-transfer parameters estimated previously in a real decomposition process of hydrogen peroxide (HP). The simulation showed that the OFT is strongly dependent on hydrogen peroxide feed concentration, feed flow rate and diffusional resistances expressed by biocatalyst global effectiveness factor. It has been shown that the more significant diffusional resistances and the higher HP conversions are, the higher the optimal feed temperature is. The calculated values of the OFT were verified with the experimental results obtained in the model reactor at selected values of the feed flow rate. Presented analysis poses a significant simplification in a numerical computational procedure and can be very useful for engineers to select the temperature condition at which bioreactor productivity is expected to be maximal.

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“…Due to the various applications for the produced esters, esterification is one of the most attractive reactions in industries. For esterification reactions, which involve the formation of esters from the reaction between an alcohol and an acid, different types of chemical reactors, such as batch reactors [1], continuous stirred tank reactors (CSTR) [2], packed bed reactors [3], plug-flow reactors (PFR), fixed bed reactors [1,4], microwave reactors [5,6] and membrane reactors [7], can be used depending on the specific requirements of the reaction. However, there are lack of comparative techno-economic data for simulated PFR and CSTR processes.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Esterification Reaction in Continuous Stirred Tank and Plug-Flow Reactors

Bakhtiyorov,

Elmanov,

Maksudov

et al. 2023

The 4th International Electronic Conference on Applied Sciences

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Optimization of esterification reaction over niobium phosphate in a packed bed tubular reactor

Cited by 24 publications

References 15 publications

Uso de compostos de nióbio como catalisadores na produção de biocombustíveis: uma revisão

Uso de compostos de nióbio como catalisadores na produção de biocombustíveis: uma revisão

Analytical Determination of the Optimal Feed Temperature for Hydrogen Peroxide Decomposition Process Occurring in Bioreactor with a Fixed-Bed of Commercial Catalase

Comparative Analysis of Esterification Reaction in Continuous Stirred Tank and Plug-Flow Reactors

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