Solar-irradiation driven biodiesel production using Cr/SiO2 photocatalyst exploiting cooperative interaction between Cr6+ and Cr3+ moieties

Corro, Grisel; Sánchez, Nallely; Pal, U.; Cebada, Surinam; Fierro, J.L.G.

doi:10.1016/j.apcatb.2016.10.005

Cited by 61 publications

(33 citation statements)

References 33 publications

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“…Since the above studies suggested that the blending of diesel with biodiesel is efficient in reducing the emitted pollutants while maintaining energy efficiency, a great deal of research focus has been devoted on the search for effective and economical methods to convert biowaste into biodiesel over the past decade. Recently, the photocatalysis-driven synthesis of biodiesel using Cr/SiO2 catalyst has shown promising results in this regard [28]. However, many challenges still remain to be addressed [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Effects of Camphor Oil Addition to Diesel on the Nanostructures and Oxidative Reactivity of Combustion-Generated Soot

et al. 2019

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Less viscous and low cetane (LVLC) fuels have emerged as the promising alternative fuels or additives to fossil fuels. Camphor oil is one such potential LVLC fuel currently under consideration. However, it's sooting propensity and subsequent effects on soot nanostructure, when blended with diesel, are not well understood. In this work, the effects of camphor and camphor oil addition to diesel on the sooting propensity, soot oxidative reactivity, and the chemical composition, structural disorders, and the morphology of soot particles are studied using a diffusion flame. The chemical and the microstructural changes in soot are investigated using several experimental techniques such as energy dispersive X-ray spectroscopy, high resolution transmission electron microscopy, Raman and electron energy loss spectroscopy, and powder X-ray diffraction, while the oxidative reactivity is studied using thermogravimetric analysis. The activation energy for O2-induced soot oxidation during the initiation stage shows a significant reduction in its value with the addition of camphor and camphor oil to diesel, which were 220 kJ/mol for diesel soot, 175 kJ/mol for 5% camphor/95% diesel soot, and 150 kJ/mol for 10% camphor oil/90% diesel soot. The blending of camphor and camphor oil with diesel results in soot with smaller fringe length and primary particle diameter, but increases the fringe tortuosity, the degree of crystal disorder, and the amounts of oxygen functionalities and aliphatics in soot. These physico-chemical changes in soot are used to explain the observed trend of oxidative reactivity. This study successfully demonstrates the potential of terpenoid keto compounds with characteristic bicyclic ring structure in improving 2 oxidative reactivity of combustion derived soots as desired in diesel particulate filter technologies.

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Section: Introductionmentioning

confidence: 99%

Effects of Camphor Oil Addition to Diesel on the Nanostructures and Oxidative Reactivity of Combustion-Generated Soot

et al. 2019

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“…Likewise, lithium modified CaO based catalysts have also been reported for the efficient methanolysis of vegetable oils, yielding 93–98 % biodiesel after 4 h of reaction . Apart from that, some new technologies have also emerged as effective tools for the transesterification reactions with homogeneous catalysts . Albeit that, some of the above systems still suffered from several limitations such as high cost and complexity of the heterogeneous catalysts’ synthesis, time‐consuming and poor tolerance to the free fatty acids (FAAs) in the raw oils .…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient and Recyclable Metal Salt Catalyst for the Production of Biodiesel: Toward Greener Process

et al. 2017

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A highly reactive and recyclable metal catalyst was reported for the transesterification of model vegetable oil with methanol to produce fatty acid methyl esters (FAMEs) under microwave condition. Among the screened catalysts, Al2(SO4)3 provided the highest FAME yield of 98.1 % at 130 oC within 30 min. Different reaction parameters were fully investigated which were found to have great influences on the product yields. Microwave energy showed a remarkable accelerated reaction rate as compared to that from the conventional oil heating way. The catalytic system also showed good tolerance to water and free fatty acids. The catalyst can be easily recovered through a simple extraction/evaporation, which still posed good reactivity in the recycling runs. The characters of the obtained biodiesel was also characterized. Mechanistic studies revealed that the hydrolysis of the metal salt to generate the corresponding cationic and acidic species were responsible for the good catalytic activity of the reaction.

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“…) and subsequently the product (Eq. ) . Again, efficient intermixing of reactants due to ultrasound cavitation in the STUSBR could provide an additional advantage by removing phase boundaries between catalyst and reactants, thus saving 90 % energy in comparison with the TBR (Fig.…”

Section: Resultsmentioning

confidence: 99%

Energy‐Efficient 2‐Ethylhexyl Acetate Synthesis with a Nano‐Sn‐Hydroxyapatite Photocatalyst

Mukhopadhyay

Chakraborty

2020

Chem Eng & Technol

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A nano‐tin oxide grafted natural‐hydroxyapatite photocatalyst was fabricated using a greener approach involving sequential application of solar‐type and ultrasound‐wave energy (STUWE). The protocol provided 76 % higher surface area, 59 % more surface acidity, and 15 % reduced band gap energy than conventionally prepared photocatalysts (CPPCs). The efficacy of the STUWE‐promoted photocatalyst (STUWEPC) was optimized for maximization of 2‐ethylhexyl acetate yield (97 %) employing an energy‐efficient solar‐type/ultrasound synergistic batch reactor. A considerably lower activation energy, estimated by Langmuir‐Hinshelwood kinetics, and higher reusability characteristics (upto 8 recycles) of the STUWEPC than CPPC highlights the superiority of the STUWE procedure.

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Solar-irradiation driven biodiesel production using Cr/SiO2 photocatalyst exploiting cooperative interaction between Cr6+ and Cr3+ moieties

Cited by 61 publications

References 33 publications

Effects of Camphor Oil Addition to Diesel on the Nanostructures and Oxidative Reactivity of Combustion-Generated Soot

Effects of Camphor Oil Addition to Diesel on the Nanostructures and Oxidative Reactivity of Combustion-Generated Soot

Highly Efficient and Recyclable Metal Salt Catalyst for the Production of Biodiesel: Toward Greener Process

Energy‐Efficient 2‐Ethylhexyl Acetate Synthesis with a Nano‐Sn‐Hydroxyapatite Photocatalyst

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