Effect of preparation method on the activity of bimetallic Ni-Co/Al2O3 catalysts for dry reforming of methane

Ергазиева, Г. Е.; Telbayeva, M. M.; Попова, А. Н.; Ismagilov, Z. R.; Dossumov, K.; Myltykbayeva, L. K.; Dodonov, V. G.; Созинов, С. А.; Niyazbayeva, Almagul

doi:10.1007/s11696-021-01516-y

Cited by 16 publications

(4 citation statements)

References 34 publications

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“…The most prevalent processes for hydrogen production are DRM, steam reforming of methane (SRM) and partial oxidation of methane (POM) [15]. Among the aforementioned processes, SRM is the most conventional method which unfortunately uses a lot of energy to produce H 2 [16,17]. In the DRM process, CH 4 and CO 2 that are known as ozone-depleting gases, are converted to the synthetic gas.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Promoted Nickel–Cobalt Bimetallic Catalysts for Biogas Reforming

et al. 2021

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The catalytic performance of Ni, Co, and Ni-Co-based catalysts on Al 2 O 3 support are investigated in the dry methane reforming reaction. Besides, the influence of La or Y promoters on catalytic activity and structural properties of synthesized catalysts are examined in this paper. The prepared catalysts are characterized using N 2 Adsorption/Desorption, FESEM, EDX, and XRD techniques. Higher average CH 4 and CO 2 conversions, as well as hydrogen yield, are obtained using Ni-Co catalyst with equal weight ratios. This could be the result of better dispersion of active sites according to the FESEM images and thus higher BET surface area of this catalyst compared with other un-promoted ones. Although the addition of La does not enhance the catalytic activity and structural properties of the 9Ni-9Co/Al 2 O 3 sample, the presence of Y 2 O 3 particles has a positive effect on both mentioned catalyst features. The maximum CH 4 conversion of 99.39%, CO 2 conversion of 92.38%, H 2 yield of 86.20% and H 2 /CO molar ratio of 1.50 are achieved using 5Y-9Ni-9Co/Al 2 O 3 at 700 °C. Besides, this catalyst shows lower deposited coke and higher stability compared with other promoted/un-promoted catalysts. The comparison between the activity of 5Y-9Ni-9Co/Al 2 O 3 and industrial 18%Ni/Al 2 O 3 during 11 h DRM shows that although 18%Ni/ Al 2 O 3 has higher conversions at first 9 h, its activity is decreased more than 5Y-9Ni-9Co/Al 2 O 3 due to the coke deposition.

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Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Promoted Nickel–Cobalt Bimetallic Catalysts for Biogas Reforming

et al. 2021

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“…The phase of cobalt oxide (Co3O4) is not fixed, as well as nickel oxide. The X-ray diffraction pattern of the catalyst sample also shows a metallic phase with a cubic face-centered lattice, the crystal cell parameter of this phase is 3.535-3.540 Å, judging by the value of the parameter, a Co-Ni solid solution with an fcc lattice is formed [36]. The size of the regions of coherent scattering of the metallic phase is ~23 nm.…”

Section: Characterization Of the Support And Supported Catalystsmentioning

confidence: 92%

Catalytic Decomposition of Methane to Hydrogen over Al2O3 Supported Mono- and Bimetallic Catalysts

Ергазиева

Makayeva

Shaimerden

et al. 2021

Bull. Chem. React. Eng. Catal.

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This article discusses the decomposition of methane in the temperature range 550–800 °C on low-percentage monometallic (Ni/g-Al2O3, Co/g-Al2O3) and bimetallic (Ni-Co/g-Al2O3) catalysts. It is shown that the bimetallic catalyst is more active in the decomposition of methane to hydrogen than monometallic ones. At a reaction temperature of 600 °C, the highest methane conversion is 81%, and the highest hydrogen yield of 51% is formed on Ni-Co/g-Al2O3. A complex of physicochemical methods (Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Temperature Programmed Reduction (TPR-H2), etc.) established that the addition of cobalt oxide to the composition of Ni/g-Al2O3 leads to the formation of surface bimetallic Ni-Co alloys, while the dispersion of particles increases and the reducibility of the catalyst is facilitated, which provides an increase in the concentration of metal particles - active centers, which can be the reason for an increase in the catalytic properties of a bimetallic catalyst in comparison with monometallic ones. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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“…The specifics of the strategy will depend on the chemical composition and physicochemical properties of the catalyst and the mechanism of its deactivation in real conditions of the catalytic process. It is known [55][56][57][58][59][60][61][62][63][64] that the introduction of modifying additives into the catalyst composition allows the control of the dispersion and redox properties of the active component and correspondingly the improvement of the activity and stability of catalytic systems. For the development of methods for direct regulation of catalyst physicochemical properties and activity it is interesting to carry out a comparative study of the effects of different additives on the catalyst physicochemical properties and functional characteristics in methane conversion to value-added chemical products and semi-products.…”

Section: Introductionmentioning

confidence: 99%

Promoters for Improvement of the Catalyst Performance in Methane Valorization Processes

Исмагилов

Восмериков

Коробицына

et al. 2021

Eurasian Chem. Tech. J.

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In this work, the introduction of modifying additives in the composition of catalysts is considered as an effective mode of improving functional characteristics of materials for two processes of methane conversion into valuable products – methane dehydroaromatization (DHA of CH4) into benzene and hydrogen and autothermal reforming of methane (ATR of CH4) into synthesis gas. The effect of type and content of promoters on the structural and electronic state of the active component as well as catalyst activity and stability against deactivation is discussed. For DHA of CH4 the operation mode of additives M = Ag, Ni, Fe in the composition of Mo-M/ZSM-5 catalysts was elucidated and correlated with the product yield and coke content. It was shown that when Ag serves as a promoter, the duration of the catalyst stable operation is enhanced due to a decrease in the rate of the coke formation. In the case of Ni and Fe additives, the Ni-Мо and Fe-Mo alloys are formed that retain the catalytic activity for a long time in spite of the carbon accumulation. For ATR of CH4, the influence of M = Pd, Pt, Re, Mo, Sn in the composition of Ni-M catalysts supported on La2O3 or Ce0.5Zr0.5O2/Al2O3 was elucidated. It was demonstrated that for Ni-M/La2O3 catalysts, Pd is a more efficient promoter that improves the reducibility of Ni cations and increases the content of active Nio centers. In the case of Ni-M/Ce0.5Zr0.5O2/Al2O3 samples, Re is considered the best promoter due to the formation of an alloy with anti-coking and anti-sintering properties. The use of catalysts with optimal promoter type and its content provides high efficiency of methane valorization processes.

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Effect of preparation method on the activity of bimetallic Ni-Co/Al2O3 catalysts for dry reforming of methane

Cited by 16 publications

References 34 publications

RETRACTED ARTICLE: Promoted Nickel–Cobalt Bimetallic Catalysts for Biogas Reforming

RETRACTED ARTICLE: Promoted Nickel–Cobalt Bimetallic Catalysts for Biogas Reforming

Catalytic Decomposition of Methane to Hydrogen over Al2O3 Supported Mono- and Bimetallic Catalysts

Promoters for Improvement of the Catalyst Performance in Methane Valorization Processes

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