Experimental and theoretical study of the thermal decomposition of ethyl acetate during fast pyrolysis

This work thoroughly investigates chemical solvent-particles interactions during the formation of composite particles by pulsed laser melting of α-Fe2O3. Two solvents, with different dielectric constants, such as ethyl acetate (εr = 6) and ethanol (εr = 24.6), were examined in terms of their effect on the morphology, size, and phase composition of iron oxide composites. We calculated the laser fluence curves using the heating-melting-evaporation approach to identify the critical particle size that undergoes the phase changes first. We assessed the temperature of the particles irradiated with 390 mJ/pulse.cm2 in both solvents, including the heat dissipation between the particles and the liquid. The phase diagram of the Fe–O–C–H system was calculated to determine the temperature–pressure relationship of the system in equilibrium. We also employed an in situ GC–MS analysis to identify the volatile products during irradiation. Based on our experimental results, we concluded that the final diameter of the composites increases from 400 to 600 nm, along with the decreasing dielectric constant of the solvent, which is related to the different polarization of the organic liquid and the degree of particle agglomeration. The reduction of hematite in ethanol proceeded much faster, ending up with Fe/FeCx, while in ethyl acetate, it ended up with Fe3O4. Among all the particles, those with a diameter of 200 nm have the highest temperature and undergo the phase transition first. The temperature of a 200 nm composite particle in ethanol is slightly lower than in ethyl acetate, i.e. 1870 K as compared to 1902 K. Phase equilibrium diagrams proved the existence of Fe, FeO, and Fe3O4 as the preferred phases at about 1900 K. Our research provides a new insight into the process of submicron particle formation during pulsed laser irradiation and allows proposing a mechanism for the growth of particles of different size and phase composition depending on the solvent.

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“…7 A). Therefore, taking into consideration the thermal decomposition, the following reaction pathways for ethyl acetate can be suggested 65 : …”

Section: Resultsmentioning

confidence: 99%

Solvent-particles interactions during composite particles formation by pulsed laser melting of α-Fe2O3

Shakeri

Polit

Grabowska-Polanowska

et al. 2022

Sci Rep

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“…Isopropanol was formed by hydrogenation and dehydration of acetone. Ethylene was formed by thermal decomposition of ethyl acetate [31,96], with an expected parallel formation of acetic acid, which contributed to the surface acetate pool.…”

Section: Acetaldehyde Reactivitymentioning

confidence: 99%

Transition Metal B-Site Substitutions in LaAlO3 Perovskites Reorient Bio-Ethanol Conversion Reactions

et al. 2021

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LaAlO3 perovskites, as such and with 25% molar Al substitution by Cu, Co, or Ga, have been prepared by sol-gel methods and tested as heterogeneous catalysts in the gas-phase conversion of ethanol. LaAlO3 presented a significant acidic character, with high formation of ethylene by ethanol dehydration. B-site substitutions increased the basicity of the catalysts, favoring the dehydrogenation of ethanol to acetaldehyde. The most reducible Cu- and Co-substituted materials, characterized by easier formation of surface oxygen vacancies, promoted the self-condensation of acetaldehyde by the Tishchenko mechanism, with formation of acetone and odd-carbon number products. Aldol coupling of acetaldehyde, favored on pure and Ga-substituted LaAlO3, led to the formation of butadiene and hexadiene. The role of Ga insertion, favoring both dehydrogenation of ethylene and dehydration of higher alcohols, corresponds to an amphoteric character. The formation of olefins and diolefins on all catalysts suggests that LaAl-based materials present the most acidic character among La-perovskites.

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“…bio-oil, pyrolysis gas, biochar) by adding heat to the feedstock in absence of oxygen. Depending on the pyrolysis and the technology applied, high thermal efficiency and low NO x , SO x , CO 2 emissions can be obtained [66][67][68].…”

Section: Thermochemical Transformationsmentioning

confidence: 99%

Latest energy and value-added product synthesis

Ponce¹

2021

Av. Cienc. Ing. (Quito)

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Biomass is key towards the production of renewables, heat, biofuels, and green chemical feedstocks. Based on results reported in the literature, Ecuador, an agriculture-based economy, has the potential of meeting its energy demands while satisfying environmental regulations, by the conversion of self-generated residual biomass. Conventional biological, chemical and thermochemical methods have been modeled and widely studied at laboratory scale for the production of biogas, bioethanol, and other solid and liquid fuels, being milestones for upcoming scaled-up applications. Recently, studies have also shown the development of new processes for the conversion of Ecuadorian biomass wastes into value-added products for future applications. Providing a more complete way to manage the waste problem, aiming to create a sustainable economic growth within a bio-economy perspective.

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Experimental and theoretical study of the thermal decomposition of ethyl acetate during fast pyrolysis

Cited by 16 publications

References 38 publications

Solvent-particles interactions during composite particles formation by pulsed laser melting of α-Fe2O3

Solvent-particles interactions during composite particles formation by pulsed laser melting of α-Fe2O3

Transition Metal B-Site Substitutions in LaAlO3 Perovskites Reorient Bio-Ethanol Conversion Reactions

Latest energy and value-added product synthesis

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