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

Nivangune, Nayana T.; Kelkar, Ashutosh A.

doi:10.1002/slct.201901621

Cited by 7 publications

(6 citation statements)

References 38 publications

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“…The intensity of NH 3 adsorption at 298 • C on the NaOH_T + R catalyst was 1.5 times higher than with the NaHCO 3 _T + R catalyst. Moreover, an asymmetric adsorption peak at about 430 • C on the NaOH_T + R catalyst may present the acid sites of NiO [69]. However, the NaHCO 3 _T + R catalyst does not find any adsorption peak at 430 • C. It implies that more NiAl 2 O 4 , rather than reduced NiO, formed on the surface of the NaOH_T + R catalyst.…”

Section: Mechanism Of Carbon (Coke) Formation In Ethanol Steam Reform...mentioning

confidence: 93%

“…The resulting value of the ratio of acid/base sites was 0.519. A previous study [69] described that the base strength distribution of the M-Al mixed oxide relies on the M n+ metal cation (such as Li + ) used for incorporation with Al 3+ cation (Li + /Al 3+ ). In our study, the Li + promoter in the Al 2 O 3 structure could effectively provide the Li + -O 2− acid-base pairs.…”

Section: Mechanism Of Carbon (Coke) Formation In Ethanol Steam Reform...mentioning

confidence: 99%

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Electrodeposition of a Li-Al Layered Double Hydroxide (LDH) on a Ball-like Aluminum Lathe Waste Strips in Structured Catalytic Applications: Preparation and Characterization of Ni-Based LDH Catalysts for Hydrogen Evolution

et al. 2022

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A functionally structured catalyst was explored for ethanol steam reforming (ESR) to generate H2. Aluminum lathe waste strips were employed as the structured catalytic framework. The mixed metal oxide (Li-Al-O) was formed on the surface of Al lathe waste strips through calcination of the Li-Al-CO3 layered double hydroxide (LDH), working as the support for the formation of Ni catalyst nanoparticles. NaOH and NaHCO3 titration solutions were, respectively, used for adjusting the pH of the NiCl2 aqueous solutions at 50 °C when developing the precursors of the Ni-based catalysts forming in-situ on the Li-Al-O oxide support. The Ni precursor on the Al structured framework was reduced in a H2 atmosphere at 500 °C for 3 h, changing the hydroxide precursor into Ni nanoparticles. The titration agent (NaOH or NaHCO3) effectively affected the physical and chemical characterizations of the catalyst obtained by the different titrations. The ESR reaction catalyzed by the structured catalysts at a relatively low temperature of 500 °C was studied. The catalyst using NaHCO3 titration presented good stability for generating H2 during ESR, achieving a high rate of H2 volume of about 122.9 L/(gcat·h). It also had a relatively low acidity on the surface of the Li-Al-O oxide support, leading to low activity for the dehydration of ethanol and high activity to H2 yield. The interactions of catalysts between the Ni precursors and the Li-Al-O oxide supports were discussed in the processes of the H2 reduction and the ESR reaction. Mechanisms of carbon formation during the ESR were proposed by the catalysts using NaOH and NaHCO3 titration agents.

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Section: Mechanism Of Carbon (Coke) Formation In Ethanol Steam Reform...mentioning

confidence: 93%

Section: Mechanism Of Carbon (Coke) Formation In Ethanol Steam Reform...mentioning

confidence: 99%

Electrodeposition of a Li-Al Layered Double Hydroxide (LDH) on a Ball-like Aluminum Lathe Waste Strips in Structured Catalytic Applications: Preparation and Characterization of Ni-Based LDH Catalysts for Hydrogen Evolution

et al. 2022

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“…This route has various added advantages as it does not corrode the equipment and does not produce waste. 12 Several catalysts are used that can help in overcoming the activation energy of the reaction, thus enabling this reaction to occur in the favor of the product. The heterogeneous catalysts such as bimetallic catalysts gave better results in terms of yield as well as selectivity due to the active basic and acidic sites available for the adsorption of reactants.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it becomes important to adopt the other route, transesterification, which gives higher yield and selectivity in comparison to the direct synthesis route. This route has various added advantages as it does not corrode the equipment and does not produce waste …”

Section: Introductionmentioning

confidence: 99%

Production of Dimethyl Carbonate Using a Zirconium–Praseodymium-Based Catalyst from Methanol and Propylene Carbonate: An Experimental and DFT Study

Dahiya

Kumar

Srivastava

et al. 2023

Ind. Eng. Chem. Res.

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In the presence of specific catalysts made using the coprecipitation approach, methanol and propylene carbonate (PC) react to yield dimethyl carbonate (DMC) as well as propylene glycol (PG) through the transesterification process. The catalytic activity of mixed zirconium and praseodymium oxides (Zr 1−x Pr x O 2 , x = 0.01−0.05), synthesized by coprecipitation, was investigated in this work towards the formation of DMC and PG. The process involves the transesterification of methanol and propylene carbonate to occur in a batch reactor. Numerous methods, including X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and CO 2 -TPD have been used to characterize the catalysts. The goal of the study is to ascertain how the combination of praseodymium and zirconium affects the yield and selectivity of DMC. DFT calculations have been performed for the catalytic system. Becke's hybrid three-parameter nonlocal exchange functional (B3), the Lee−Yang−Parr (LYP) correlation functional (B3LYP), and the SDD basis set were all used to optimize the geometries. Zr 0.96 Pr 0.04 O 2 was found to have the best PC conversion (95.9%), while its yield and selectivity were 52.5% and 54.7%, respectively, at 165 °C, methanol/PC ratio = 6.5, and time of 3 h.

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“…LDH is widely used in ion adsorption, , medical treatment, flame retardants, and catalysis , due to its special structure and properties. As a catalyst, LDH can effectively facilitate the esterification and transesterification of small molecules. − Additionally, LDH is often used as a reinforcing nanomaterial to enhance the mechanical properties of epoxy resin. , Recent work has demonstrated that the anion species and metal ions of LDH have a significant impact on the curing of epoxy resin. − For example, Karami et al found that ZnAl-NO 3 -LDH could promote the ring-opening curing reaction of epoxy resin due to the catalytic effect of Zn 2+ and NO 3 – . , However, most reports only focus on the effect of LDH on the curing behavior of the epoxy-amine system, and thus the effect of LDH on the epoxy-carboxylic acid system remains to be explored. Therefore, the LDH is expected to catalyze the curing of an epoxy vitrimer based on DTER and to simultaneously enhance the repairable efficiency and mechanical properties, instead of only the mechanical reinforcement effect of other nanomaterials such as graphene oxide and carbon nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Mechanically Strong, Thermally Healable, and Recyclable Epoxy Vitrimers Enabled by ZnAl-Layer Double Hydroxides

Zhang

Huo

et al. 2021

ACS Sustainable Chem. Eng.

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To meet the demand of sustainable development, epoxy vitrimers based on the dynamic transesterification reaction (DTER) have received considerable attention recently due to their reprocessability and repairability. However, they suffer from low mechanical strength and rely heavily on external catalysts to ensure their curing and repair. Herein, we report a facile design of a novel ZnAl-LDH-catalyzed epoxy vitrimer nanocomposite via introducing ZnAl-layered double metal hydroxide (ZnAl-LDH) nanosheets. Our results show that ZnAl-LDH can be well dispersed in the epoxy vitrimer. Notably, ZnAl-LDH has multifunctionality, which can simultaneously catalyze the curing reaction and enhance the mechanical strength and repairable efficiency of the resultant vitrimer. For instance, the peak curing temperature of epoxy vitrimer with 2 wt % ZnAl-LDH is 8 °C lower than that of an epoxy vitrimer under the same loading between Zn2+ of Zn(OAc)2, demonstrating a strong catalytic action. The tensile strength and Young’s modulus of ZnAl-LDH/epoxy resin (ER) increase from 18 and 156 MPa to 42 and 307 MPa, respectively, due to the reinforcing effect of ZnAl-LDH and the increased cross-linking density. The repairable efficiency of ZnAl-LDH/ER can reach 95% after repair at 200 °C for 1 h, which is mainly due to the abundant catalytic sites and large contact areas of the ZnAl-LDH lamella. Hence, this work offers an innovative and scalable strategy for creating epoxy vitrimers combining exceptional mechanical strength and high repairable efficiency, which holds great promise for many practical applications in the industry.

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

Cited by 7 publications

References 38 publications

Electrodeposition of a Li-Al Layered Double Hydroxide (LDH) on a Ball-like Aluminum Lathe Waste Strips in Structured Catalytic Applications: Preparation and Characterization of Ni-Based LDH Catalysts for Hydrogen Evolution

Electrodeposition of a Li-Al Layered Double Hydroxide (LDH) on a Ball-like Aluminum Lathe Waste Strips in Structured Catalytic Applications: Preparation and Characterization of Ni-Based LDH Catalysts for Hydrogen Evolution

Production of Dimethyl Carbonate Using a Zirconium–Praseodymium-Based Catalyst from Methanol and Propylene Carbonate: An Experimental and DFT Study

Mechanically Strong, Thermally Healable, and Recyclable Epoxy Vitrimers Enabled by ZnAl-Layer Double Hydroxides

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