Effect of Ca and Sr in MgO(100) on the activation of methanol and methyl acetate

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

doi:10.1016/j.cattod.2017.03.062

Cited by 10 publications

(3 citation statements)

References 41 publications

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“…For the heterogeneous-CaO-catalyzed reaction, surface catalytic reactions need to be considered. The interaction between reactants and solid catalyst is assumed to involve dissociative adsorption and reaction . A detailed mechanism is described in Scheme .…”

Section: Results and Discussionmentioning

confidence: 99%

“…The interaction between reactants and solid catalyst is assumed to involve dissociative adsorption and reaction. 30 A detailed mechanism is described in Scheme 4. Accordingly, methanol is dissociatively adsorbed on the surface of the active catalyst to form intermediate I, 14,29,31−34 For modeling purposes, the reaction pathway for the heterogeneous-CaO-catalyzed transesterification was simplified into three steps (Scheme 5a).…”

Section: (Table 2)mentioning

confidence: 99%

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Kinetic Study of CaO-Catalyzed Transesterification of Cyclic Carbonates with Methanol

Song

Subramaniam

Chaudhari

2018

Ind. Eng. Chem. Res.

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Simultaneous catalytic contributions of CaO in the liquid phase (homogeneous) and in the solid phase (heterogeneous) for transesterification are considered in the kinetic analysis, because sparingly soluble CaO has significant catalytic activity. Experimental concentration−time profiles were obtained at different catalyst loadings, propylene carbonate (PC) concentrations, and methanol concentrations in a temperature range of 20−60 °C in a stirred batch reactor for both the homogeneous and heterogeneous reactions. Kinetic models based on power-law rate forms were evaluated and discriminated to fit the experimental data. Reaction orders of 1 for PC, 2 for methanol, and 1 for both DMC and PG fit the experimental data best for the homogeneous reaction, whereas orders of 0.35 for PC, 1.9 for methanol, and 0 for both DMC and PG fit the experimental data best for the heterogeneous reaction. The heterogeneous CaO catalyst (E a = 56.8 kJ/mol) was found to be more active than the homogeneous CaO catalyst (E a = 82.4 kJ/mol). The reaction-order and activation-energy differences may be attributed to different reaction pathways for homogeneous-and heterogeneous-CaO-catalyzed transesterifications. Different reaction mechanisms were proposed for the homogeneous and heterogeneous reactions, respectively. It is observed that kinetic models based on mechanisms fit better than power-law models, especially for the heterogeneous reaction. The kinetic model for the homogeneous reaction suggests the formation of active species CH 3 O − . Then, PC gets activated by the CH 3 O − to form the first intermediate, which then forms the second intermediate by reaction with one mole of methanol. This is followed by a reaction of the second intermediate with another molecule of methanol to form the final products, DMC and PG. However, for the heterogeneous-CaO-catalyzed reaction, adsorption of PC and dissociative adsorption of methanol on the surface of the active species is assumed to occur simultaneously. Then, the adsorbed PC and methanol react to directly form the final products, DMC and PG. The good fits of the kinetic models with the experimental data suggest that the proposed homogeneous-and heterogeneous-reaction mechanisms represent the transesterification of propylene carbonate satisfactorily.

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Section: Results and Discussionmentioning

confidence: 99%

Section: (Table 2)mentioning

confidence: 99%

Kinetic Study of CaO-Catalyzed Transesterification of Cyclic Carbonates with Methanol

Song

Subramaniam

Chaudhari

2018

Ind. Eng. Chem. Res.

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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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Synthesis of the zirconium dioxide activated carbon–based heterogeneous acid catalyst to catalyze esterification for biodiesel production with molecular simulation

Tang

Niu

et al. 2021

Biomass Conv. Bioref.

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Effect of Ca and Sr in MgO(100) on the activation of methanol and methyl acetate

Cited by 10 publications

References 41 publications

Kinetic Study of CaO-Catalyzed Transesterification of Cyclic Carbonates with Methanol

Kinetic Study of CaO-Catalyzed Transesterification of Cyclic Carbonates with Methanol

Biodiesel at the Crossroads: A Critical Review

Synthesis of the zirconium dioxide activated carbon–based heterogeneous acid catalyst to catalyze esterification for biodiesel production with molecular simulation

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