Co-nanocasting synthesis of Cu based composite oxide and its promoted catalytic activity for methanol steam reforming

Xu, Tao; Zou, Jie; Tao, Weitong; Zhang, Shaoyin; Cui, Li; Zeng, Fanli; Wang, Dazhi; Cai, Wei

doi:10.1016/j.fuel.2016.06.081

Cited by 21 publications

(13 citation statements)

References 47 publications

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“…According to the literature, the binding energy values of tetrahedral and octahedral Al atoms were 73.7 and 74.5 eV, respectively. Thus, the Al component in this study mainly existed in octahedral AlO 6 site of AlOOH, which convinced the Al-NMR results.…”

Section: Results and Discussionsupporting

confidence: 80%

“…These results were in good consistence with the XRD and 27 Al-NMR analysis. The two strong bands centered at 1329 and 1595 cm –1 were ascribed to graphite carbon and amorphous carbon, respectively . The presence of two carbon bands on the fresh catalyst elucidated the coke deposits formed during the process of LP heat treatment.…”

Section: Results and Discussionmentioning

confidence: 95%

“…For each catalyst, Bragg's angles (2θ) from 5 and 85°were scanned at a rate of 8°/min. Solid-state 27 Al NMR was characterized by a Bruker AVANCE III 400 WB spectrometer with a 4 mm high-speed DOTY probe spun at 12 kHz. The spectra were achieved at 104.3 MHz by a 10°pulse of 0.3 μs with a recycle delay of 1 s. 1.0 M Al(NO 3 ) 3 aqueous solution was served as standard to determine the chemical shift of 27 Al.…”

Section: ■ Exprimental Sectionmentioning

confidence: 99%

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Synergy between Active Sites of Ternary CuZnAlOOH Catalysts in CO Hydrogenation to Ethanol and Higher Alcohols

Liu

Cui

Jia

et al. 2020

ACS Sustainable Chem. Eng.

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Currently, the Cu-based catalyst has become a promising candidate for ethanol and higher alcohols synthesis (HAs) from synthesis gas (H2 + CO), but all these catalysts contain F–T elements (e.g., Co and Fe) and alkalis because carbon chain growth reaction occurs on these metal components. Herein, two series of ternary CuZnAlOOH catalysts with various Cu and Al proportions were synthesized using a complete liquid-phase method and studied in the conversion of syngas in a slurry bed reactor. Significantly higher selectivity of ethanol (40 wt %) and HA (65 wt %) with approximately 20% CO conversion was achieved when the n (Cu)/n (Al) = 2/0.8, which was ascribed the highest copper surface area (S Cu) and the surface Cu content. It was found that the Cu component had a significant effect on CO conversion, while the Al component had more influence on the selectivity of HA. Besides, the coke deposition was discovered to be the main reason for catalyst deactivation. The generation of hydrocarbons and alcohols followed A–S–F distributions, which was consistent with a representative mechanism of HA generation by CO insertion into the CH x intermediate. A synergetic mechanism between Cu0–Cu+ and AlOOH active sites was proposed based on the characterization analysis and activity results, in which Cu0–Cu+ synergy acted as sites for H2 dissociative adsorption and associative adsorption of CO, while the AlOOH facilitated the dissociation of the C–O bond. Bifunctionality of the Cu and AlOOH active sites and their cooperation created their synergy in CO hydrogenation to ethanol and HA. This work provided us a new concept to understand and develop carbon chain growth mechanism, and it also could provide reference for other related carbon chain growth reactions.

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Section: Results and Discussionsupporting

confidence: 80%

Section: Results and Discussionmentioning

confidence: 95%

Section: ■ Exprimental Sectionmentioning

confidence: 99%

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Synergy between Active Sites of Ternary CuZnAlOOH Catalysts in CO Hydrogenation to Ethanol and Higher Alcohols

Liu

Cui

Jia

et al. 2020

ACS Sustainable Chem. Eng.

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“…A surface density of 1.47 × 10 19 Cu atoms/m 2 and a stoichiometry of 2 Cu atoms per oxygen atom were assumed. The copper surface area and the Cu dispersion were calculated according to the equations described elsewhere

2 C u + {normalN}_{2} O \to {C u}_{2} O + {normalN}_{2}

…”

Section: Methodsmentioning

confidence: 99%

“…An important measurement to characterize the catalytic activity of copper is the turnover frequency (TOF) . This number quantifies the specific activity of an active centre and is defined by the number of catalytic cycles or molecular reactions that occur in the active site per time unit.…”

Section: Methodsmentioning

confidence: 99%

Utilization of sol‐gel CuO‐ZnO‐Al₂O₃ catalysts in the methanol steam reforming for hydrogen production

et al. 2017

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In this work five CuO‐ZnO‐Al2O3 catalysts were synthesized using the sol‐gel method, with different Cu percentages, for use in the methanol steam reforming reaction, at 300 °C, aiming to generate hydrogen for PEM (Polymer Electrolyte Membrane) fuel cells. The specific area and total pore volume of the materials decreased with increasing Cu content and consequently reduced the alumina content. Also, the area decreased with increasing the calcination temperature, due to the sintering and coalescence of Cu crystals. The metal dispersion decreased (from 32 to 4 %) with increasing the Cu amount (from 8.9 to 48.4 %). For this reaction, the catalyst with the second highest Cu concentration (40.6 %) was the most active and had the higher Cu area (34.8 m2Cu/gcat). Meanwhile, the catalyst with the lowest Cu content (8.9 %) had its active sites better used, presenting the highest turnover frequency, specific area, and metal dispersion. The experimental results indicated that there was an optimum composition for the catalyst, which would provide the best area and dispersion for the reaction, with a view to industrial application. This composition was statistically calculated to be 33 % (g/g) of Cu.

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Hydrolysis Precipitation Method for the Preparation of Cu‐ZnO@Al₂O₃ Catalyst in Methanol Steam Reforming

Wen,

Liu,

Kong

et al. 2024

ChemistrySelect

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A hydrolysis precipitation method was developed to prepare Cu based catalyst for methanol steam reforming. A comparison of the hydrolysis precipitation and the conventional coprecipitation method was conducted. The test results present that Cu‐ZnO@Al2O3 prepared by hydrolysis precipitation exhibits better catalytic activity and stability in MSR reaction. XRD, XRF, EDS, SEM, TPR, XPS and N2 adsorption/desorption reveal that the high catalytic performance of Cu based catalyst from hydrolysis precipitation could be attributed to developed pore organization, surface enrichment of active components and higher reducibility.

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Co-nanocasting synthesis of Cu based composite oxide and its promoted catalytic activity for methanol steam reforming

Cited by 21 publications

References 47 publications

Synergy between Active Sites of Ternary CuZnAlOOH Catalysts in CO Hydrogenation to Ethanol and Higher Alcohols

Synergy between Active Sites of Ternary CuZnAlOOH Catalysts in CO Hydrogenation to Ethanol and Higher Alcohols

Utilization of sol‐gel CuO‐ZnO‐Al₂O₃ catalysts in the methanol steam reforming for hydrogen production

Hydrolysis Precipitation Method for the Preparation of Cu‐ZnO@Al₂O₃ Catalyst in Methanol Steam Reforming

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Co-nanocasting synthesis of Cu based composite oxide and its promoted catalytic activity for methanol steam reforming

Cited by 21 publications

References 47 publications

Synergy between Active Sites of Ternary CuZnAlOOH Catalysts in CO Hydrogenation to Ethanol and Higher Alcohols

Synergy between Active Sites of Ternary CuZnAlOOH Catalysts in CO Hydrogenation to Ethanol and Higher Alcohols

Utilization of sol‐gel CuO‐ZnO‐Al2O3 catalysts in the methanol steam reforming for hydrogen production

Hydrolysis Precipitation Method for the Preparation of Cu‐ZnO@Al2O3 Catalyst in Methanol Steam Reforming

Contact Info

Product

Resources

About

Utilization of sol‐gel CuO‐ZnO‐Al₂O₃ catalysts in the methanol steam reforming for hydrogen production

Hydrolysis Precipitation Method for the Preparation of Cu‐ZnO@Al₂O₃ Catalyst in Methanol Steam Reforming