Vanadium phosphate catalysts for biodiesel production from acid industrial by-products

Domingues, Carina; Correia, M. Joana Neiva; Carvalho, R.; Henriques, Carlos; Bordado, João; Dias, Ana Paula Soares

doi:10.1016/j.jbiotec.2012.07.009

Cited by 21 publications

(7 citation statements)

References 37 publications

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“…In the previous section, the catalyst proved to be effective for two cycles, so it is worth studying a means to increase the effective use of the catalyst. In this regard, the literature indicates that burning or acid cleaning can restore some catalytic activity [ 56 , 57 ]. Although acid cleaning is a viable option, it does not apply here because, at the end of pyrolysis, a solid mixture (30% catalyst and 40% solid product) of about 70 wt.% tire was produced.…”

Section: Resultsmentioning

confidence: 99%

A “Wastes-Treat-Wastes” Technology: Role and Potential of Spent Fluid Catalytic Cracking Catalysts Assisted Pyrolysis of Discarded Car Tires

2021

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Spent fluid catalytic cracking catalysts (FCC catalysts) produced by the petrochemical industry are considered to be environmentally hazardous waste, and precious metals and heavy metals deposited on the surface make them difficult to treat. Even so, these catalysts retain some of their activity. The pyrolysis of waste tires is considered to be one of the most effective ways to solve the fossil fuel resource crisis, and this study attempts to catalyze the pyrolysis of waste tires using spent catalysts to increase the value of both types of waste. FCC catalysts reduced the activation energy (E) of waste tire pyrolysis. When the catalyst dosage was 30 wt.%, the E of tread rubber decreased from 238.87 kJ/mol to 181.24 kJ/mol, which was a 19.94% reduction. The E of the inner liner decreased from 288.03 kJ/mol to 209.12 kJ/mol, a 27.4% reduction. The spent catalyst was more effective in reducing the E and solid yield of the inner liner made of synthetic rubber. It should be emphasized that an appropriate increase in the heating rate can fully exert the selectivity of the catalyst. The catalyst could also be effectively used twice, and the optimum ratio of catalyst/waste tires was about 1/4.5. Compared with specially prepared catalysts, it is more cost-effective to use such wastes as a catalyst for waste tire pyrolysis.

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Section: Resultsmentioning

confidence: 99%

A “Wastes-Treat-Wastes” Technology: Role and Potential of Spent Fluid Catalytic Cracking Catalysts Assisted Pyrolysis of Discarded Car Tires

2021

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“…zeolite), a macroporous vanadium phosphate, containing Brønsted (P-OH) and Lewis acid sites (V¼O), was also reported as an efficient heterogeneous acid catalyst for biodiesel production. Domingues et al [144] investigated the catalytic activity of vanadium phosphate catalyst for biodiesel production from a high acidity industrial by-product containing 26-39% FFA, 0.6% to 1.1% water, and 45-66% fatty acid methyl esters. It was suggested that the methyl esters, present in the reaction mixture, acted as a co-solvent which helped in reducing the mass transfer limitation during the methanolysis reaction.…”

Section: Sourcementioning

confidence: 99%

A review on recent advancement in catalytic materials for biodiesel production

Avhad

Marchetti

2015

Renewable and Sustainable Energy Reviews

340

133

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“…The use of other transition metals such as zirconium, hafnium and antimonial-based catalysts for transesterification has also been studied [58,59]. The transesterification reaction over a Fe-Zn catalyst, performed at 170 °C, with the alcohol to oil mole ratio of 15:1 and 3 wt.% of catalyst, reached the oil conversion of 99% within 5 h. The catalyst activity was attributed to the Lewis acid active sites of probably Zn 2+ on the catalyst surface [4].…”

Section: Review Of Transition Metals Lanthanide Actinide and Their mentioning

confidence: 99%

Heterogeneous kinetics of vegetable oil transesterification at high temperature

Nasreen

Liu

Lukić³

et al. 2016

CI&CEQ

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Article Highlights • Kinetics of transesterification catalyzed by different catalysts from literature was analyzed • Transition and earth metals as catalyst for the high temperature transesterification • Three kinetic models were used for predicting the effect of high temperature transesterification • Apparent reaction rate constant and other parameters for more complicated models were determined Abstract Currently, the catalytic efficiency and reusability of the solid base catalysts cannot meet the demand of industrial biodiesel production under low temperature. The purpose of this study is to define the kinetics of heterogeneous transesterification process that could be used for the prediction of the biodiesel synthesis at high temperature and pressure. The focus in this study was paid to recently reported data obtained with different catalysts used for biodiesel synthesis in a batch reactor at high temperatures. It was shown that three kinetic models, including: a) irreversible first order reaction, b) reaction with changeable order and c) resistances of mass transfer and chemical reaction at active sites of the catalyst, could be applied for predicting the effect of high temperature of the transesterification. The apparent reaction rate constant of the irreversible first order reaction was determined, as well as the parameters of the other two, more complicated kinetic models. The best agreement was obtained with the more complicated models and the mean relative percent deviation between calculated and experimentally determined triacylglycerols conversion for these kinetic models is between 3 and 10%.

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Vanadium phosphate catalysts for biodiesel production from acid industrial by-products

Cited by 21 publications

References 37 publications

A “Wastes-Treat-Wastes” Technology: Role and Potential of Spent Fluid Catalytic Cracking Catalysts Assisted Pyrolysis of Discarded Car Tires

A “Wastes-Treat-Wastes” Technology: Role and Potential of Spent Fluid Catalytic Cracking Catalysts Assisted Pyrolysis of Discarded Car Tires

A review on recent advancement in catalytic materials for biodiesel production

Heterogeneous kinetics of vegetable oil transesterification at high temperature

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