Oxidation of methane over polyoxide catalysts

Dossumov, K.; Yergazyieva, Gaukhar Y.; Myltykbayeva, L. K.; Suyunbayev, U.; Asanov, N. A.; Gyul’maliev, A. M.

doi:10.3103/s1068364x15050026

Cited by 9 publications

(4 citation statements)

References 27 publications

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“…In connection with the transition to "green" technology, intensive work is underway throughout the world to find alternative energy sources and energy carriers. One of the most promising modern energy carriers is hydrogen, which is determined by its ecological purity, versatility and high efficiency of energy conversion ratio [14][15][16]. Commercial hydrogen is produced using a SRM.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…Among them, the most common are carbon dioxide (CO 2 ), which is largely produced by the fuel and energy industries and methane (CH 4 ), which is the main component of natural and associated petroleum gases [1]. Therefore, the utilization of methane and carbon dioxide into valuable products will make it possible to remove a wide range of economic, environmental and social problems for Kazakhstan as well [2].…”

Section: Introductionmentioning

confidence: 99%

Dry Reforming of Methane on Carriers and Oxide Catalysts to Synthesis-Gas

Dossumov

Yergaziyeva

Myltykbayeva

et al. 2018

Eurasian Chem. Tech. J.

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The catalytic activity of carriers: θ‒Al2O3, γ‒Al2O3, 5A, 4A, 3A and 13X and the oxides of metals of variable valency ‒ NiO, La2O3, CuO, MoO3, MgO, V2O5, WO3, CoO, Cr2O3, ZnO, ZrO2, CeO2, Fe2O3, supported on the effective carrier γ‒Al2O3 by the method of capillary impregnation of the support with solutions of nitric salts of metals were investigated in the process of carbon dioxide conversion of methane (DRM). The optimal technological regimes for the process were: the reaction temperature -800 °C, the space velocity of the initial reactants ‒ 1500 h-1 with a methane to carbon dioxide ratio equal to 1. It was found that among the studied catalysts the highest activity is shown by the NiO/γ‒Al2O3 catalyst, where the yields of hydrogen and carbon monoxide reaches 45.4 and 42.4% by volume, respectively, when methane conversion is 89%. The XRF method showed that the content of alumina and nickel oxide after the reaction remained unchanged at 96.7 and 3.0%, respectively. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), small angle X-ray scattering (XRS) determined that nickel-containing NiO/γ‒Al2O3 catalyst form nickel nanoparticles (6.4‒10 and 50‒150 nm) and a uniform their distribution on the surface of the carrier takes place. These physical chemical characteristics have a positive effect on the activity of NiO/γ‒Al2O3 catalyst in the process of carbon dioxide conversion of methane to synthesis gas.

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“…The major reason holding back the practical application of such a process is the lack of inexpensive, selective, and stable catalysts resistant to coking. Thus, there is now considerable work on the search for coking-resistant catalysts for the selective oxidation of methane [6][7][8][9].…”

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confidence: 99%

Effect of Co, Ce, and La Oxides as Modifying Additives on the Activity of an NiO/ γ-Al2O3 Catalyst in the Oxidation of Methane to Give Synthesis Gas

et al. 2016

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A study was carried out on the effect of Co, Ce, and La oxides as modifying additives on the activity of an NiO/g-Al 2 O 3 catalyst in the partial oxidation of methane. The introduction of cerium and lanthanum oxides enhances the resistance of the catalyst to coking. The increase in the activity of the lanthanum-modified catalyst is related to a lower temperature required for its reduction and increased dispersion of the metallic nickel particles.The present major area of research on methane transformation concerns oxidation to give synthesis gas. Hydrogen is a component of synthesis gas and used in a number of large-scale industrial chemical reactions. In addition, hydrogen may be used in the future as an alternative motor fuel [1-3]. The steam reforming methane conversion is the only industrial heterogeneous catalytic process for the production of synthesis gas. Disadvantages of this method include large energy expenditures and the use of expensive catalysts with high nickel content up to 30 mass % [4,5]. An alternative to this process might be the partial oxidation of methane in the presence of oxygen. The major reason holding back the practical application of such a process is the lack of inexpensive, selective, and stable catalysts resistant to coking. Thus, there is now considerable work on the search for coking-resistant catalysts for the selective oxidation of methane [6][7][8][9].In the present work, we studied the effect of Co, Ce, and La oxides as modifying additives on the activity and selectivity of an NiO/g-Al 2 O 3 catalyst in the partial oxidation of methane to give synthesis gas. EXPERIMENTALThe catalysts were prepared by the combined capillary (incipient wetness) impregnation of the support using solutions of nickel nitrate salts (Ni(NO 3 ) 2 ·6H 2 O) and modifying additives (La(NO 3 ) 3 ·6H 2 O, Ce(NO 3 ) 2 ·6H 2 O, and Co(NO 3 ) 2 ·6H 2 O),

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Oxidation of methane over polyoxide catalysts

Cited by 9 publications

References 27 publications

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

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

Dry Reforming of Methane on Carriers and Oxide Catalysts to Synthesis-Gas

Effect of Co, Ce, and La Oxides as Modifying Additives on the Activity of an NiO/ γ-Al2O3 Catalyst in the Oxidation of Methane to Give Synthesis Gas

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