Sintered Fe/CNT framework catalysts for CO2 hydrogenation into hydrocarbons

Chernyak, S. A.; Иванов, А. С.; Stolbov, Dmitrii N.; Максимов, С. В.; Маслаков, К. И.; Чернавский, П. А.; Pokusaeva, Yana A.; Koklin, A. E.; Богдан, В. И.; Savilov, S. V.

doi:10.1016/j.carbon.2020.06.067

Cited by 45 publications

(17 citation statements)

References 63 publications

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“…If this is the case, then Y b modification could improve the antisintering of Ni particles on the Al 2 O 3 support and consequently increase the catalytic activity and/or stability of the Ni/Al 2 O 3 catalyst in CO 2 methanation. Studies have shown that Ni/Al 2 O 3 catalysts prepared by various conventional methods, such as coprecipitation, impregnation, , sol–gel process, microwave-assisted synthesis, solid-state reaction, and mechanical mixing, , always suffer from severe catalyst deactivation in the methanation reaction. , …”

Section: Introductionmentioning

confidence: 99%

Methanation of CO₂ over Yb-Promoted Ni/Al₂O₃ Catalysts Prepared by Solution Combustion

et al. 2022

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Introducing a proper promoter into Ni-based catalysts for CO 2 methanation is an effective method to improve their catalytic performance. In this work, we prepare a series of Ybmodified Ni/Al 2 O 3 catalysts by a solution combustion approach and characterize them using various techniques, including nitrogen adsorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), temperature-programmed hydrogen reduction (H 2 -TPR), hydrogen desorption (H 2 -TPD), carbon dioxide desorption (CO 2 -TPD), Fourier transform infrared (FTIR), and Thermogravimetric/differential thermal (TG/DTA), and test their CO 2 methanation activity in a fixed-bed reactor under conditions of 200−500 °C, 0.1−2 MPa, space velocities ranging from 7200 to 16,200 h −1 , and feed molar ratios of H 2 /CO 2 from 1 to 4. We found that Yb modification promotes the dispersion of reducible NiO on Al 2 O 3 and simultaneously leads to the creation of new Yb-involved CO 2 chemisorption sites responsible for the improved catalytic activity and stability of Ni/Al 2 O 3 catalysts for CO 2 methanation so that the Yb-modified Ni/Al 2 O 3 catalysts exhibit higher catalytic activities than Ni/Al 2 O 3 catalysts without Yb.

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Section: Introductionmentioning

confidence: 99%

Methanation of CO₂ over Yb-Promoted Ni/Al₂O₃ Catalysts Prepared by Solution Combustion

et al. 2022

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“…Several laboratory-scale studies show significant improvement in producing olefin-and paraffin-range hydrocarbons, but the catalyst stability remains an issue. [16][17][18][19][20] The present study uses 20 % Fe 2 O 3 loaded onto a redox-active BZY15 support that promotes bi-functionality. The active Fe metal provides high redox activity and BZY15 support provides catalytic stability in hydrocarbon-and CO-containing environments.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that the catalyst metal, metal‐support interactions, and microstructure play critical roles in product distribution. Several laboratory‐scale studies show significant improvement in producing olefin‐ and paraffin‐range hydrocarbons, but the catalyst stability remains an issue [16–20] . The present study uses 20 % Fe 2 O 3 loaded onto a redox‐active BZY15 support that promotes bi‐functionality.…”

Section: Introductionmentioning

confidence: 99%

CO₂ Hydrogenation to Hydrocarbons over Fe/BZY Catalysts

et al. 2022

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This manuscript reports a CO2 hydrogenation process in a catalytic laboratory‐scale packed‐bed reactor using an Fe/BZY15 (BaZr0.85Y0.15O3‐δ) catalyst to form hydrocarbons (e. g., CH4, C2+) at elevated pressure of 30 bar and temperatures in the range 270≤T≤375 °C. The effects of temperature, feed composition (i. e., CO2/H2 ratio, and residence time (i. e., Weight Hourly Space Velocity (WHSV) are studied to understand the relationship between CO2 conversion and carbon selectivity. Catalyst characterization elucidates the relationships between the catalyst structure, surface adsorbates, and reaction pathways. Thermodynamic analyses guide the experimental conditions and assist in interpreting results. While the feed composition and temperature influence the product distribution, the results suggest that the higher‐carbon (C2+) selectivity and yield depend strongly on residence time. The results suggest that the CO2 hydrogenation reaction pathway is similar to Fischer–Tropsch (FT) synthesis. The reaction begins with CO2 activation to form CO, followed by chain‐growth reactions similar to the FT process. The CO2 activation depends on the redox activity of the catalyst. However, the carbon chain growth depends primarily on the residence time. as is the case for the FT synthesis, high residence time (on the orders of hours) is required to achieve high C2+ yield.

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“…However, the target product was formic acid or formamide, which determined the choice of the catalysts (homogeneous Ru complexes) and the mode of operation. There is a number of our works devoted to the hydrogenation of CO 2 under supercritical conditions [ 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. A supercritical media may enhance the catalyst activity and prolong its lifetime [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

Carbon Dioxide Reduction with Hydrogen on Fe, Co Supported Alumina and Carbon Catalysts under Supercritical Conditions

et al. 2021

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Reduction of CO2 with hydrogen into CO was studied for the first time on alumina-supported Co and Fe catalysts under supercritical conditions with the goal to produce either CO or CH4 as the target products. The extremely high selectivity towards methanation close to 100% was found for the Co/Al2O3 catalyst, whereas the Fe/Al2O3 system demonstrates a predominance of hydrogenation to CO with noticeable formation of ethane (up to 15%). The space–time yield can be increased by an order of magnitude by using the supercritical conditions as compared to the gas-phase reactions. Differences in the crystallographic phase features of Fe-containing catalysts cause the reverse water gas shift reaction to form carbon monoxide, whereas the reduced iron phases initiate the Fischer–Tropsch reaction to produce a mixture of hydrocarbons. Direct methanation occurs selectively on Co catalysts. No methanol formation was observed on the studied Fe- and Co-containing catalysts.

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Sintered Fe/CNT framework catalysts for CO2 hydrogenation into hydrocarbons

Cited by 45 publications

References 63 publications

Methanation of CO₂ over Yb-Promoted Ni/Al₂O₃ Catalysts Prepared by Solution Combustion

Methanation of CO₂ over Yb-Promoted Ni/Al₂O₃ Catalysts Prepared by Solution Combustion

CO₂ Hydrogenation to Hydrocarbons over Fe/BZY Catalysts

Carbon Dioxide Reduction with Hydrogen on Fe, Co Supported Alumina and Carbon Catalysts under Supercritical Conditions

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Sintered Fe/CNT framework catalysts for CO2 hydrogenation into hydrocarbons

Cited by 45 publications

References 63 publications

Methanation of CO2 over Yb-Promoted Ni/Al2O3 Catalysts Prepared by Solution Combustion

Methanation of CO2 over Yb-Promoted Ni/Al2O3 Catalysts Prepared by Solution Combustion

CO2 Hydrogenation to Hydrocarbons over Fe/BZY Catalysts

Carbon Dioxide Reduction with Hydrogen on Fe, Co Supported Alumina and Carbon Catalysts under Supercritical Conditions

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Methanation of CO₂ over Yb-Promoted Ni/Al₂O₃ Catalysts Prepared by Solution Combustion

Methanation of CO₂ over Yb-Promoted Ni/Al₂O₃ Catalysts Prepared by Solution Combustion

CO₂ Hydrogenation to Hydrocarbons over Fe/BZY Catalysts