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      Coke-resistance over Rh–Ni bimetallic catalyst for low temperature dry reforming of methane

      , , , , ,
      International Journal of Hydrogen Energy
      Elsevier BV

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          A Review on Bimetallic Nickel-Based Catalysts for CO2 Reforming of Methane

          In recent years, CO2 reforming of methane (dry reforming of methane, DRM) has become an attractive research area because it converts two major greenhouse gasses into syngas (CO and H2 ), which can be directly used as fuel or feedstock for the chemical industry. Ni-based catalysts have been extensively used for DRM because of its low cost and good activity. A major concern with Ni-based catalysts in DRM is severe carbon deposition leading to catalyst deactivation, and a lot of effort has been put into the design and synthesis of stable Ni catalysts with high carbon resistance. One effective and practical strategy is to introduce a second metal to obtain bimetallic Ni-based catalysts. The synergistic effect between Ni and the second metal has been shown to increase the carbon resistance of the catalyst significantly. In this review, a detailed discussion on the development of bimetallic Ni-based catalysts for DRM including nickel alloyed with noble metals (Pt, Ru, Ir etc.) and transition metals (Co, Fe, Cu) is presented. Special emphasis has been provided on the underlying principles that lead to synergistic effects and enhance catalyst performance. Finally, an outlook is presented for the future development of Ni-based bimetallic catalysts.
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            An overview on dry reforming of methane: strategies to reduce carbonaceous deactivation of catalysts

            Catalytic reforming of methane (CH 4 ) with carbon dioxide (CO 2 ), known as dry reforming of methane (DRM), produces synthesis gas, which is a mixture of hydrogen (H 2 ) and carbon monoxide (CO). Catalytic reforming of methane (CH 4 ) with carbon dioxide (CO 2 ), known as dry reforming of methane (DRM), produces synthesis gas, which is a mixture of hydrogen (H 2 ) and carbon monoxide (CO). CH 4 + CO 2 → 2CO + 2H 2 , Δ H ° = 247.3 kJ mol −1 , Δ G = 61 770–67.32 T . The DRM process has gained much attention recently as it reduces greenhouse gases (GHG), CO 2 and CH 4 , in the atmosphere. In addition to reducing GHG, the DRM process produces valuable chemicals (CO + H 2 ), provides a good approach to utilizing biogas and natural gas with a significant amount of CO 2 , has good capability as a chemical energy transmission system as compared to steam reforming, and finally yields the desired unity H 2 /CO ratio for Fischer–Tropsch synthesis. The bimetallic Ni-based catalysts supported on Al 2 O 3 /TiO 2 and promoted with Ce/ZrO 2 show remarkable performances in the DRM process. But, carbonaceous deactivation of the catalysts is the major problem faced during this process. Numerous studies have been cited on various aspects of DRM, and some papers are also devoted to reviewing carbonaceous deposition problems and their remedies. However, some lacunae exist, which are highlighted in the present review paper on strategies to reduce the carbonaceous deactivation of catalysts for improved DRM efficiency by appropriate catalyst development, operating conditions, and flow reactor designs. The disposal of spent catalysts falls under the category of hazardous industrial materials and is also required to comply with stringent environmental regulations. Therefore, regeneration and reclamation techniques for spent catalysts have also been discussed.
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              Estimation of Electronegativity Values of Elements in Different Valence States

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                Author and article information

                Contributors
                Journal
                International Journal of Hydrogen Energy
                International Journal of Hydrogen Energy
                Elsevier BV
                03603199
                April 2023
                April 2023
                : 48
                : 37
                : 13890-13901
                Article
                10.1016/j.ijhydene.2022.12.299
                9cd43375-8048-489e-bed5-7414589aac34
                © 2023

                https://www.elsevier.com/tdm/userlicense/1.0/

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