Low-temperature methanol synthesis via (CO2 + CO) combined hydrogenation using Cu-ZnO/Al2O3 hybrid nanoparticle cluster

Hoang, Thanh Truc Nguyen; Tsai, De‐Hao

doi:10.1016/j.apcata.2022.118844

Cited by 12 publications

(4 citation statements)

References 55 publications

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“…Besides, crystalline domains are also found with a d-spacing of ca. 0.247 nm (Figure 5(C 2 )), which is associated with the (101) for cubic ZnO [42]. Moreover, the d-spacing of ca.0.280 nm (022) is associated with the γ-Al 2 O 3 besides the presence of amorphous regions (the inset of Figure 5(C 2 )).…”

Section: Textural and Morphological Propertiesmentioning

confidence: 92%

“…With the addition of the basic promoters to the alumina, the sol-gel prepared binary support oxides decrease their amounts of surface acid sites, prevailing very few weak to medium acid sites. Based on the reports, MgO, ZnO and La 2 O 3 are assumed to be basic oxides and therefore, the absence of acid sites is not expected [41][42][43][44]46]. In contrast, alumina itself has both acid and base sites characteristic of an amphoteric oxide [42,44].…”

Section: Acidity Of the Catalystsmentioning

confidence: 99%

“…Based on the reports, MgO, ZnO and La 2 O 3 are assumed to be basic oxides and therefore, the absence of acid sites is not expected [41][42][43][44]46]. In contrast, alumina itself has both acid and base sites characteristic of an amphoteric oxide [42,44]. At the opposite, the acidity can be tuned by altering the alumina chemical composition through doping, and yet aluminas are a typical solid base, when promoted by alkali-metals, alkali-fluorides, alkali-amides, and/or alkali-hydroxide forming as super or strong base catalysts [42,44].…”

Section: Acidity Of the Catalystsmentioning

confidence: 99%

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Effect of Basic Promoters on Porous Supported Alumina Catalysts for Acetins Production

et al. 2022

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A facile strategy for the design of porous supports was obtained by modifying the sol-gel method followed by the wet impregnation technique. In this respect, herein, the acidity of the γ-Al2O3 phase was modulated by adding basic MgO, La2O3 or ZnO promoters to form binary supported catalysts. The Ni and Co dispersion on the supports associated with their tunable acidity and morphologies resulted in highly porous supported alumina-based catalysts. The physicochemical properties of the solids were comprehensively investigated by XRD, textural properties, Raman and FTIR spectroscopy, SEM-EDS, TEM, EPR and XPS analyses. The catalytic performances in the esterification of glycerol in the presence of acetic acid (EG) for the acetins production were evaluated. The highly dispersed NiO and Co3O4 active species on binary porous supports produced synergistic effects appearing to be the reason for the activity of the solids in the EG reaction. Under the optimized reaction conditions, NiCo/MgO-Al2O3 was found to be a robust solid with superior catalytic performance and improved stability in four reaction cycles with 65.0% of glycerol conversion with an exclusive selectivity of 53% for triacetin. The presence of Co2+/Co3+ and Ni2+ strongly interacting with the spinel γ-Al2O3 and MgAl2O4 phases, the latter having a large number of lattice oxygen species, was considered another active component besides those of Ni and Co in the esterification of glycerol.

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Section: Textural and Morphological Propertiesmentioning

confidence: 92%

Section: Acidity Of the Catalystsmentioning

confidence: 99%

Section: Acidity Of the Catalystsmentioning

confidence: 99%

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Effect of Basic Promoters on Porous Supported Alumina Catalysts for Acetins Production

et al. 2022

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“…The model of Ovesen et al [26] considered the three overall reactions, with CO and CO 2 having their own adsorption sites and the possibility of dynamic change in the nature of the active sites (typically referred to as morphological change) as a function of gas compositions [27][28][29][30][31][32][33][34][35][36][37][38]. For example, morphological changes can also be initiated by the adsorption of oxidizing or reducing components and temperature, all of which may exercise a change influence on the surface free energy and introduce a strain in the copper particles [4].…”

Section: Literature Review and Theorymentioning

confidence: 99%

Development of an Improved Kinetic Model for CO2 Hydrogenation to Methanol

Mbatha,

Thomas,

Parkhomenko

et al. 2023

Catalysts

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The kinetics of methanol synthesis remains debatable for various reasons, such as the lack of scientifically conclusive agreement about reaction mechanisms. The focus of this paper is on the evaluation of the intrinsic kinetics of the methanol synthesis reaction based on CO2 hydrogenation and the associated reverse water–gas shift as overall reactions. The industrial methanol synthesis catalyst, Cu/ZnO/Al2O3/MgO, was used for performing the kinetic studies. An optimal kinetic model was assessed for its ability to predict the experimental data from differential to integral conditions, contrary to the typical fitting of only the integral conditions’ data (common practice, as reported in the literature). The catalyst testing and kinetic evaluations were performed at various temperatures (210–260 °C) and pressures (40–77 bar), and for different stoichiometric numbers (0.9–1.9), H2/CO2 ratios (3.0–4.4) and carbon oxide ratios (0.9–1.0), in an isothermal fixed bed reactor, operated in a plug-flow mode. Experiments with CO in the feed were also generated and fitted. Different literature kinetic models with different assumptions on active sites, rate-determining steps, and hence, model formulations were fitted and compared. The original Seidel model appeared to fit the kinetic data very well, but it has twelve parameters. The modified model (MOD) we propose is derived from this Seidel model, but it has fewer (nine) parameters—it excludes CO hydrogenation, but it takes into consideration the morphological changes of active sites and CO adsorption. This MOD model, with three active sites, gave the best fit to all the data sets.

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Metal-organic framework-derived base catalyst for conversion of dimethyl carbonate to glycerol carbonate

Tran,

Senthil Raja,

Lee

et al. 2024

Applied Catalysis A: General

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Low-temperature methanol synthesis via (CO2 + CO) combined hydrogenation using Cu-ZnO/Al2O3 hybrid nanoparticle cluster

Cited by 12 publications

References 55 publications

Effect of Basic Promoters on Porous Supported Alumina Catalysts for Acetins Production

Effect of Basic Promoters on Porous Supported Alumina Catalysts for Acetins Production

Development of an Improved Kinetic Model for CO2 Hydrogenation to Methanol

Metal-organic framework-derived base catalyst for conversion of dimethyl carbonate to glycerol carbonate

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