High-efficiency and low-cost Li/ZnO catalysts for synthesis of glycerol carbonate from glycerol transesterification: The role of Li and ZnO interaction

Song, Xianghai; Wu, Yuanfeng; Cai, Fufeng; Pan, Donghui; Xiao, Guomin

doi:10.1016/j.apcata.2016.12.019

Cited by 98 publications

(46 citation statements)

References 44 publications

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“…The Li−Al 500 surfaces comprise of Li, Al and O. Poor spectra for Li 1s was observed at 55.2 eV, which may be due to the incorporation of Li + into Al−O crystal lattices or the low Li content in Al−O structure . Binding energy data for Al 2p have been reported for Figure S7 represents that the Al 2p spectra firstly appears in the Al 3+ state 74.8 eV, which corresponds to the oxidized state of Al.…”

Section: Resultsmentioning

confidence: 95%

“…From all synthesized MMOs, Li−Al 500 showed maximum amount of medium (133 μmol CO 2 g −1 ) and strong (82 μmol CO 2 g −1 ) basic sites showing overall (total) basicity of 274 μmol CO 2 g −1 . Increase in basicity for Li−Al 500 was observed mainly due to: (1) The presence of Li + ; which improves the partial negative charge on oxygen ions in Al 2 O 3 (due to the lower ionization potential of Li compared with Al) leading to the presence of weak and moderate basic sites on Al 2 O 3 surface. (2) The strong basic sites originate from [O 2− ] which is resulted from the substitution of Al 3+ by Li + in the Al 2 O 3 lattice.…”

Section: Resultsmentioning

confidence: 99%

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Selective Synthesis of Dimethyl Carbonate via Transesterification of Propylene Carbonate with Methanol Catalyzed by Bifunctional Li‐Al Nano‐composite

Nivangune

Kelkar

2019

ChemistrySelect

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A series of binary mixed metal oxides (MMOs) were synthesized by combination of Mn+/Al3+ (Mn+= Li, Mg, Co, Ni, Zn) via co‐precipitation method and screened for transesterification of propylene carbonate (PC) with methanol. The aim of this study was to understand the role of acid‐base properties of MMOs on the activity and selectivity towards dimethyl carbonate (DMC) synthesis. The MMOs were characterized in detail by XRD, BET, TEM, NH3 and CO2‐TPD techniques. Catalysts synthesized by various combination of Mn+/Al3+ showed different textural and surface properties and the strength of acid‐base sites were also found to be significantly altered. These changes in physicochemical properties significantly affected the PC conversion and selectivity to DMC. Li+ incorporated in Al3+ showed the formation of octahedral α‐LiAlO2 phase having more amounts of active sites (O2−) present on the edges and corner of the structure. This resulted in easy accessibility of active sites and higher activity compared to other catalysts screened. Furthermore the catalyst retained high activity and selectivity for six consecutive recycle experiments; which is highly desirable for large‐scale application.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Selective Synthesis of Dimethyl Carbonate via Transesterification of Propylene Carbonate with Methanol Catalyzed by Bifunctional Li‐Al Nano‐composite

Nivangune

Kelkar

2019

ChemistrySelect

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“…A slight binding energy (BE) shift of about –0.7 eV relative to pristine Co was observed (Figure a) in the sample of Co‐Fe‐10 %Zn‐B, whereas the BE of B 1s displays a positive BE shift (+ 0.3 eV) compared with pristine B (Figure c). This may be due to the electron donation from B to Co. Interestingly, the BE of Fe 2p displays a fluctuated shift (negative shift, then positive shift) with the increasing of Zn content (Figure b), which could be attributed to the change of chemical environment of Fe and the interaction between Zn and Fe , . The negative shift of Fe 2p BE from 707.85 eV (Co‐Fe‐B) to 707.50 eV (Co‐Fe‐1 %Zn‐B) indicates alloying Zn in the quaternary amorphous alloy downshifted the Fermi level of Fe due to the strong electronic interactions among Co, Fe, Zn and B, however, the Fe 2p BE shift in the opposite direction for the Co‐Fe‐10 %Zn‐B sample comparing to Co‐Fe‐1 %Zn‐B should be attributed to the fact that the electronegativity of Zn (1.65) is more weaker than that of Fe (1.83), leading more electron transfer from Zn to Fe when excessive Zn are incorporated into the material, which further demonstrates the strong interaction among the multi‐compositions of the prepared amorphous alloys.…”

Section: Resultsmentioning

confidence: 96%

Synthesis of Hierarchically Porous Amorphous Alloy Hollow Sphere with High Surface Area as Effective and Selective Catalysts for Cinnamaldehyde Hydrogenation

et al. 2020

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The exploitation of cheap, stable, and efficient catalysts is highly significant and greatly valuable for hydrogenation reactions. A novel amorphous alloy hollow sphere with hierarchical pores was synthesized by using in situ generated H2 bubble as a soft template with the chemical reduction method, in which the co‐deposited calcium carbonate acts as a hard template for fabricating the porous structure. The optimized amorphous Co‐Fe‐1 %Zn‐B alloy shows excellent catalytic performance with 97.7 % of cinnamaldehyde (CAL) conversion and 100 % of cinnamyl alcohol (COL) selectivity, which is superior to the reported results catalyzed by Co‐based catalysts, and even to those of noble metal catalysts for the selective CAL hydrogenation to COL. The enhanced catalytic activity of the prepared amorphous alloy is ascribed to the large active surface area, hierarchically porous and hollow structure, and the synergistic effect of Fe and Zn in the materials. The synthesized amorphous alloy also shows good stability and can be recycled for more than five runs. A possible fabrication mechanism for the hollow amorphous alloy porous spheres was also proposed and discussed.

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“…[56] The transesterification of glycerolw ith DMC by using basic mixed metal oxide catalysts is gaining increasing relevance from the standpoint of sustainability( Scheme 4, route a). [57,58] Partiald ecarboxylation of GC may lead to GD as byproduct of the transes-terification process (Scheme 4). [59] By using suitableh eterogeneous catalytic systems, [60,61] GD can be obtainedw ith good selectivity (about 80 %) over GC for quantitative glycerol conversion.…”

Section: Monocarbonate Monomers From Glycerol Derivativesmentioning

confidence: 99%

Polymers Based on Cyclic Carbonates as Trait d'Union Between Polymer Chemistry and Sustainable CO₂ Utilization

et al. 2019

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Given the large amount of anthropogenic CO2 emissions, it is advantageous to use CO2 as feedstock for the fabrication of everyday products, such as fuels and materials. An attractive way to use CO2 in the synthesis of polymers is by the formation of five‐membered cyclic organic carbonate monomers (5CCs). The sustainability of this synthetic approach is increased by using scaffolds prepared from renewable resources. Indeed, recent years have seen the rise of various types of carbonate syntheses and applications. 5CC monomers are often polymerized with diamines to yield polyhydroxyurethanes (PHU). Foams are developed from this type of polymers; moreover, the additional hydroxyl groups in PHU, absent in classical polyurethanes, lead to coatings with excellent adhesive properties. Furthermore, carbonate groups in polymers offer the possibility of post‐functionalization, such as curing reactions under mild conditions. Finally, the polarity of carbonate groups is remarkably high, so polymers with carbonates side‐chains can be used as polymer electrolytes in batteries or as conductive membranes. The target of this Review is to highlight the multiple opportunities offered by polymers prepared from and/or containing 5CCs. Firstly, the preparation of several classes of 5CCs is discussed with special focus on the sustainability of the synthetic routes. Thereafter, specific classes of polymers are discussed for which the use and/or presence of carbonate moieties is crucial to impart the targeted properties (foams, adhesives, polymers for energy applications, and other functional materials).

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High-efficiency and low-cost Li/ZnO catalysts for synthesis of glycerol carbonate from glycerol transesterification: The role of Li and ZnO interaction

Cited by 98 publications

References 44 publications

Selective Synthesis of Dimethyl Carbonate via Transesterification of Propylene Carbonate with Methanol Catalyzed by Bifunctional Li‐Al Nano‐composite

Selective Synthesis of Dimethyl Carbonate via Transesterification of Propylene Carbonate with Methanol Catalyzed by Bifunctional Li‐Al Nano‐composite

Synthesis of Hierarchically Porous Amorphous Alloy Hollow Sphere with High Surface Area as Effective and Selective Catalysts for Cinnamaldehyde Hydrogenation

Polymers Based on Cyclic Carbonates as Trait d'Union Between Polymer Chemistry and Sustainable CO₂ Utilization

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High-efficiency and low-cost Li/ZnO catalysts for synthesis of glycerol carbonate from glycerol transesterification: The role of Li and ZnO interaction

Cited by 98 publications

References 44 publications

Selective Synthesis of Dimethyl Carbonate via Transesterification of Propylene Carbonate with Methanol Catalyzed by Bifunctional Li‐Al Nano‐composite

Selective Synthesis of Dimethyl Carbonate via Transesterification of Propylene Carbonate with Methanol Catalyzed by Bifunctional Li‐Al Nano‐composite

Synthesis of Hierarchically Porous Amorphous Alloy Hollow Sphere with High Surface Area as Effective and Selective Catalysts for Cinnamaldehyde Hydrogenation

Polymers Based on Cyclic Carbonates as Trait d'Union Between Polymer Chemistry and Sustainable CO2 Utilization

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Polymers Based on Cyclic Carbonates as Trait d'Union Between Polymer Chemistry and Sustainable CO₂ Utilization