Correlation between synthesis pH, structure and Cu/MgO/Al2O3 heterogeneous catalyst activity and selectivity in CO2 hydrogenation to methanol

Dasireddy, Venkata D.B.C.; Neja, Strah Štefančič; Likozar, Blaž

doi:10.1016/j.jcou.2018.09.002

Cited by 85 publications

(58 citation statements)

References 53 publications

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“…This nevertheless emphasizes the impact of temperature on these reactions, demonstrating that high temperatures are favored. Figure 6 depicts the XRD patterns of the calcined, reduced and spent after 3, 6, 9, and 18 h. As previously mentioned in the temperature study, the calcined and reduced sample of the catalyst show the expected peaks of Fe 2 O 3 , MgO and Al 2 O 3 in the calcined sample as well as metallic Fe peaks emerging in the reduced sample (Malinowski et al, 2009;Strassberger et al, 2013;Wang et al, 2014;Dasireddy et al, 2018). However, when observing the spent catalysts, there is a decrease in the intensity of the Fe peak at 44.7 • that can be seen in all spent samples, compared to the reduced sample.…”

Section: Effect Of Reaction Timementioning

confidence: 62%

“…The XRD patterns not shown for sake of briefness reveal the presence of MgO, Al 2 O 3 , and Fe can be seen in the spent samples alongside emerging Fe 2 O 3 peaks (Malinowski et al, 2009;Strassberger et al, 2013;Wang et al, 2014;Dasireddy et al, 2018) for the same reasons explained above-partial oxidation of iron under hydrothermal conditions.…”

Section: Influence Of Reactants Ratiomentioning

confidence: 95%

“…Moving on to the 250 • C experiment, the corresponding metallic Fe peaks are smaller compared to peaks from the reduced sample, that could be due to loss of active phase through oxide formation at 2θ = 35.4, 43.1, and 62.6 • . These minor peaks are identified as Fe 2 O 3 (Wang et al, 2014;Dasireddy et al, 2018).…”

Section: Effect Of Temperaturementioning

confidence: 99%

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Influence of Reaction Parameters on the Catalytic Upgrading of an Acetone, Butanol, and Ethanol (ABE) Mixture: Exploring New Routes for Modern Biorefineries

et al. 2020

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Here we present a comprehensive study on the effect of reaction parameters on the upgrade of an acetone, butanol and ethanol mixture-key molecules and platform products of great interest within the chemical sector. Using a selected high performing catalyst, Fe/MgO-Al 2 O 3 , the variation of temperature, reaction time, catalytic loading, and reactant molar ratio have been examined in this reaction. This work is aiming to not only optimize the reaction conditions previously used, but to step toward using less energy, time, and material by testing those conditions and analyzing the sufficiency of the results. Herein, we demonstrate that this reaction is favored at higher temperatures and longer reaction time. Also, we observe that increasing the catalyst loading had a positive effect on the product yields, while reactant ratios have shown to produce varied results due to the role of each reactant in the complex reaction network. In line with the aim of reducing energy and costs, this work showcases that the products from the upgrading route have significantly higher market value than the reactants; highlighting that this process represents an appealing route to be implemented in modern biorefineries.

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Section: Effect Of Reaction Timementioning

confidence: 62%

Section: Influence Of Reactants Ratiomentioning

confidence: 95%

See 1 more Smart Citation

Influence of Reaction Parameters on the Catalytic Upgrading of an Acetone, Butanol, and Ethanol (ABE) Mixture: Exploring New Routes for Modern Biorefineries

et al. 2020

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“…When the temperature increased to 250°C, the corresponding values changed to 13.4% and 13% respectively. In addition, other combinations of Cu and metal/metal oxides have been explored extensively in methanol synthesis field, such as Cu/Mg/Al [31], Cu/ZnO/ZrO2 [33,34]. For comparison's sake, the performances of other Mo2C related catalysts have also been listed in table 1 [29,30].…”

Section: Resultsmentioning

confidence: 99%

Effect of Cu and Cs in the b-Mo2C System for CO2 Hydrogenation to Methanol

Dongil¹,

Zhang²,

Pastor‐Pérez³

et al. 2020

Preprint

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Mitigation of Anthropogenic CO2 emissions possess a major global challenge for modern societies. Herein catalytic solutions are meant to play a key role. Among the different catalysts for CO2 conversion Cu supported on molybdenum carbide is receiving increasing attention. Hence, in the present communication we show the activity, selectivity and stability of fresh-prepared -Mo2C catalysts and compare the results with those of Cu/Mo2C, Cs/Mo2C and Cu/Cs/Mo2C in CO2 hydrogenation reactions. The results showed that all the catalysts were active and the main reaction product was methanol. The results showed that copper-cesium and molybdenum effectively interact and that cesium promoted the formation of metallic Mo. While, the incorporation of copper is positive to improve the activity and selectivity to methanol, the presence of Mo0 phase was detrimental for the conversion and selectivity. Moreover, the catalysts promoted by cesium underwent redox surface transformations during the reaction that diminished their catalytic performance. The molybdenum phase in Cu/Mo2C changes during reaction leading to metallic molybdenum and tuning the catalytic activity.

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“…Methanol is currently produced at the industrial scale from synthesis gas (syngas), with a CO/H 2 composition called metgas , according to the stoichiometric Equation (1). The metgas is predominantly derived from the steam reforming of fossil fuels (mainly methane) and it contains small concentration (3 vol.%) of CO 2 [45]. The metgas stream passes over conventional copper-based (Cu/ZnO/Al 2 O 3 ) catalysts at high pressure (5–10 MPa) and moderate temperature (200–300 °C).…”

Section: Heterogeneous Catalytic Hydrogenation Of Co2 To Methanolmentioning

confidence: 99%

Methanol Synthesis from CO2: A Review of the Latest Developments in Heterogeneous Catalysis

et al. 2019

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Technological approaches which enable the effective utilization of CO2 for manufacturing value-added chemicals and fuels can help to solve environmental problems derived from large CO2 emissions associated with the use of fossil fuels. One of the most interesting products that can be synthesized from CO2 is methanol, since it is an industrial commodity used in several chemical products and also an efficient transportation fuel. In this review, we highlight the recent advances in the development of heterogeneous catalysts and processes for the direct hydrogenation of CO2 to methanol. The main efforts focused on the improvement of conventional Cu/ZnO based catalysts and the development of new catalytic systems targeting the specific needs for CO2 to methanol reactions (unfavourable thermodynamics, production of high amount of water and high methanol selectivity under high or full CO2 conversion). Major studies on the development of active and selective catalysts based on thermodynamics, mechanisms, nano-synthesis and catalyst design (active phase, promoters, supports, etc.) are highlighted in this review. Finally, a summary concerning future perspectives on the research and development of efficient heterogeneous catalysts for methanol synthesis from CO2 will be presented.

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Correlation between synthesis pH, structure and Cu/MgO/Al2O3 heterogeneous catalyst activity and selectivity in CO2 hydrogenation to methanol

Cited by 85 publications

References 53 publications

Influence of Reaction Parameters on the Catalytic Upgrading of an Acetone, Butanol, and Ethanol (ABE) Mixture: Exploring New Routes for Modern Biorefineries

Influence of Reaction Parameters on the Catalytic Upgrading of an Acetone, Butanol, and Ethanol (ABE) Mixture: Exploring New Routes for Modern Biorefineries

Effect of Cu and Cs in the b-Mo2C System for CO2 Hydrogenation to Methanol

Methanol Synthesis from CO2: A Review of the Latest Developments in Heterogeneous Catalysis

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