Theoretical aspects of methyl acetate and methanol activation on MgO(100) and (501) catalyst surfaces with application in FAME production

Man, Isabela Costinela; Soriga, Stefan Gabriel; Pârvulescu, Vasile I.

doi:10.1016/j.apsusc.2016.09.114

Cited by 10 publications

(5 citation statements)

References 55 publications

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“…Secondary ion mass spectrometry [16] indicates preferential segregation of MgO in MgO-ZrO2 catalysts. MgO has been widely studied for application in biodiesel production [22][23][24][25][26][27][28]. However, there are few reports on the application of Mg-Zr mixed oxides to triacyl glyceride transesterification, and the nature of active catalytic species in such systems is poorly established.…”

Section: Introductionmentioning

confidence: 99%

On the Impact of the Preparation Method on the Surface Basicity of Mg–Zr Mixed Oxide Catalysts for Tributyrin Transesterification

et al. 2018

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Mixed metal oxides are promising heterogeneous catalysts for biofuel production from lipids via alcoholysis, however, the impact of solid acidity and/or basicity on reactivity is comparatively poorly understood. Two systematically related families of MgO-ZrO 2 mixed oxide catalysts were therefore prepared by different synthetic routes to elucidate the impact of surface acid-base properties on catalytic performance in the transesterification of tributyrin with methanol. The resulting materials were characterized by TGA-MS, ICP-OES, N 2 porosimetry, XRD, TEM, XPS, DRIFTS, and CO 2 -temperature-programmed desorption (TPD). MgO-ZrO 2 catalysts prepared by both non-aqueous impregnation and citric acid-mediated sol-gel routes exhibit excellent activity and stability. The citrate routes favor highly dispersed MgO and concomitant Lewis acid-base pair formation at the interface with zirconia. However, for both the citrate and impregnation routes, tributyrin transesterification occurs over a common, strongly basic MgO active site.

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Section: Introductionmentioning

confidence: 99%

On the Impact of the Preparation Method on the Surface Basicity of Mg–Zr Mixed Oxide Catalysts for Tributyrin Transesterification

et al. 2018

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“…In addition, the hydrophobicity of PFOS is higher than that of PFOA, which is also one of the reasons for its higher adsorption capacity. The adsorbate molecules may interact with the carbon surface through nonspecific dispersion force to cause the adsorption of PFAS on the adsorbent . As shown in Figure c,d, the contact angles of biochar before and after hydrochloric acid modification to DI water were greater than 90°, which proved that both of them had good hydrophobicity.…”

Section: Resultsmentioning

confidence: 88%

“…The adsorbate molecules may interact with the carbon surface through nonspecific dispersion force to cause the adsorption of PFAS on the adsorbent. 42 As shown in Figure 4c,d, the contact angles of biochar before and after hydrochloric acid modification to DI water were greater than 90°, which proved that both of them had good hydrophobicity. The adsorption performance of H-SL biochar for PFAS was significantly better than that of SL biochar, which meant that the hydrophobic interaction was not the main interaction in the adsorption of PFAS on H-SL.…”

Section: Adsorption Mechanism Of Pfasmentioning

confidence: 76%

Enhanced Removal of Polyfluoroalkyl Substances by Simple Modified Biochar: Adsorption Performance and Theoretical Calculation

et al. 2023

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To cope with the widespread polyfluoroalkyl substance (PFAS) pollution in the global aquatic environment, this study prepared an acid-modified biochar adsorbent derived from sludge with satisfactory performance. The theoretical maximum adsorption capacities of the adsorbent for perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) were determined to be 72.17 and 45.88 mg·g–1, respectively. The theoretical calculation of the adsorption of biochar surface functional groups with PFOS and PFOA was first performed in this study, and the mechanism of the adsorption process was inferred with a combination of experimental results and redundancy analysis. The adsorption mechanism is composed mainly of the following three aspects: (I) electrostatic interaction between the positively charged biochar and the deprotonated PFAS; (II) hydrogen bonding between anionic species of PFAS and functional groups; and (III) hydrophobic interaction between long-chain hydrophobic PFAS and biochar. Electrostatic interaction plays a major role in the three main adsorption mechanisms under acidic media. Meanwhile, different functional groups have different adsorption energies for PFAS, and CO has the highest adsorption energy. The findings in this work could provide great insights into the adsorption of PFAS on modified biochar as an environmentally friendly adsorbent to promote resource reuse, improve water quality, and ensure human health.

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“…These studies manifested that the reaction conditions to obtain Gliperol are similar to that for the production of Biodiesel. Likewise, this reaction has been studied over heterogeneous acid catalysts [68][69][70][71][72][73][74][75][76][77][78][79] as well as using lipases as biocatalysts, either in solvent-free systems [80][81][82][83][84][85][86][87][88][89][90][91][92][93][94][95][96][97] or in ionic liquids [98][99][100][101]. Furthermore, many other innovative technologies have also been applied, such as supercritical conditions [102][103][104][105][106][107][108][109][110][111][112][113][114][115]…”

Section: Biodiesel-like Biofuels That Integrate Glycerol As Glycerol mentioning

confidence: 99%

Biodiesel at the Crossroads: A Critical Review

et al. 2019

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The delay in the energy transition, focused in the replacement of fossil diesel with biodiesel, is mainly caused by the need of reducing the costs associated to the transesterification reaction of vegetable oils with methanol. This reaction, on an industrial scale, presents several problems associated with the glycerol generated during the process. The costs to eliminate this glycerol have to be added to the implicit cost of using seed oil as raw material. Recently, several alternative methods to convert vegetable oils into high quality diesel fuels, which avoid the glycerol generation, are being under development, such as Gliperol, DMC-Biod, or Ecodiesel. Besides, there are renewable diesel fuels known as “green diesel”, obtained by several catalytic processes (cracking or pyrolysis, hydrodeoxygenation and hydrotreating) of vegetable oils and which exhibit a lot of similarities with fossil fuels. Likewise, it has also been addressed as a novel strategy, the use of straight vegetable oils in blends with various plant-based sources such as alcohols, vegetable oils, and several organic compounds that are renewable and biodegradable. These plant-based sources are capable of achieving the effective reduction of the viscosity of the blends, allowing their use in combustion ignition engines. The aim of this review is to evaluate the real possibilities that conventional biodiesel has in order to success as the main biofuel for the energy transition, as well as the use of alternative biofuels that can take part in the energy transition in a successful way.

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Theoretical aspects of methyl acetate and methanol activation on MgO(100) and (501) catalyst surfaces with application in FAME production

Cited by 10 publications

References 55 publications

On the Impact of the Preparation Method on the Surface Basicity of Mg–Zr Mixed Oxide Catalysts for Tributyrin Transesterification

On the Impact of the Preparation Method on the Surface Basicity of Mg–Zr Mixed Oxide Catalysts for Tributyrin Transesterification

Enhanced Removal of Polyfluoroalkyl Substances by Simple Modified Biochar: Adsorption Performance and Theoretical Calculation

Biodiesel at the Crossroads: A Critical Review

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