Co Hydrogenation on a Nickel Catalyst .

Owing to the increasing emissions of carbon dioxide (CO 2 ), human life and the ecological environment have been affected by global warming and climate changes. To mitigate the concentration of CO 2 in the atmosphere various strategies have been implemented such as separation, storage, and utilization of CO 2 . Although it has been explored for many years, hydrogenation reaction, an important representative among chemical conversions of CO 2 , offers challenging opportunities for sustainable development in energy and the environment. Indeed, the hydrogenation of CO 2 not only reduces the increasing CO 2 buildup but also produces fuels and chemicals. In this critical review we discuss recent developments in this area, with emphases on catalytic reactivity, reactor innovation, and reaction mechanism. We also provide an overview regarding the challenges and opportunities for future research in the field (319 references).

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“…79 Instead, noble metal (e.g. Ru, Pd, and Pt) is stable at operating conditions and more active for CO 2 methanation than nickel.…”

Section: Metal-based Heterogeneous Catalystsmentioning

confidence: 99%

Recent advances in catalytic hydrogenation of carbon dioxide

et al. 2011

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“…A small downshift of CO 2 conversion at temperature lower than 350 • C was found for both catalysts while the high temperature activity remained almost intact, suggesting that the mixed oxide catalysts suffered from confined inhibition effects by the interactions between CO and Ni surface. Apart from the influence mentioned above, the formation of mobile Ni carbonyl species and subsequently growth of Ni particles at low temperature by the facilitation of CO was also the main cause for the deactivation of Ni-based catalysts [15]. Thus, the long-term performances of both samples in the presence of 1% CO were studied at 275 • C for 100 h. CO addition resulted in an immediate decrease of approximately 6% in CO 2 conversion over both NiMgO x and NiWMgO x , 45% to 38% and 67% to 61% respectively, a consequence of the competitive adsorption of CO.…”

Section: Influence Of Comentioning

confidence: 99%

“…Nevertheless, the large-scale application of these catalysts has been limited by their high cost. As an alternative solution, non-noble transition metal catalysts (e.g., Ni, Co) have attracted increasing attention for their comparable methanation activity with highly improved cost-efficiency [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…The deactivation of catalysts by coke formation and sintering of metal particles is accelerated when a large amount of heat is released as the exothermal reaction further proceeds [16,24,25]. Besides, the poison effect of CO via the formation and the migration of mobile Ni(CO) 4 species on catalyst surface during the methanation reaction cannot be ruled out [15,26]. Nevertheless, several researchers substantiated that the formation of Ni-Mg solid solution was beneficial for the resistance against deactivation over MgO supported Ni catalysts [20].…”

Section: Introductionmentioning

confidence: 99%

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A novel W-doped Ni-Mg mixed oxide catalyst for CO2 methanation

Yan

Dai

et al. 2016

Applied Catalysis B: Environmental

185

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a b s t r a c tNovel Ni-W-Mg mixed oxide catalysts (NiWMgO x ) were prepared by homogeneous precipitation and attempted for the methanation of CO 2 . Adding W remarkably promoted the activity with improved stability, anti-CO-poisoning ability and resistance against coke formation compared to the undoped NiMgO x catalyst. The superior reactivity of monodentate formate towards hydrogenation than that of bidentate formate species was identified by DRIFTS analysis and the formation of more active monodentate formate species was indisputably facilitated by W additives, leading to the greatly enhanced catalytic activity. H 2 -TPR and CO 2 -TPD characterization showed that doping W increased the number of stable CO 2 adsorption sites and helped in anchoring the Ni sites as a result of strengthened Ni-Mg interaction, both of which were responsible for the enhanced CO 2 methanation activity and the improved resistance against sintering.

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“…Ni catalysts, however, may be deactivated even at low temperatures due to sintering of Ni particles, formation of mobile Ni sub-carbonyls, or carbon deposition. 3,4 Therefore several other transition metals have been investigated for the methanation of CO 2 (Ru, Rh, Pd, Co, Fe, Cu, Pt, Mg, Zn, Zr, Ir, Cu, Ag, W, Mo, and Mn) (see ref.…”

Section: Introductionmentioning

confidence: 99%

Structure–function relationship during CO₂ methanation over Rh/Al₂O₃ and Rh/SiO₂ catalysts under atmospheric pressure conditions

Martin

Hemmingsson

Wang

et al. 2018

Catal. Sci. Technol.

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The effect of the support material and chemical state of Rh in Rh/A 2 O 3 and Rh/SiO 2 model catalysts during CO 2 hydrogenation were studied by a combined array of in situ characterisation techniques including diffuse reflectance infrared Fourier transform spectroscopy, energy-dispersive X-ray absorption spectroscopy and high-energy X-ray diffraction at 250-350°C and atmospheric pressure. CO 2 methanation proceeds via intermediate formation of adsorbed CO species on metallic Rh, likely followed by their hydrogenation to methane. The linearly-bonded CO species is suggested to be a more active precursor in the hydrogenation compared to the bridge-bonded species, which seems to be related to particle size effects: for larger particles mainly the formation of inactive bridge-bonded CO species takes place. Further, analysis of the chemical state of Rh under the reaction conditions reveal a minor formation of RhO x from dissociation of CO 2 , which is a consequence of the increased activity observed over the Rh/Al 2 O 3 catalyst.

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Co Hydrogenation on a Nickel Catalyst .

Cited by 125 publications

References 25 publications

Recent advances in catalytic hydrogenation of carbon dioxide

Recent advances in catalytic hydrogenation of carbon dioxide

A novel W-doped Ni-Mg mixed oxide catalyst for CO2 methanation

Structure–function relationship during CO₂ methanation over Rh/Al₂O₃ and Rh/SiO₂ catalysts under atmospheric pressure conditions

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Co Hydrogenation on a Nickel Catalyst .

Cited by 125 publications

References 25 publications

Recent advances in catalytic hydrogenation of carbon dioxide

Recent advances in catalytic hydrogenation of carbon dioxide

A novel W-doped Ni-Mg mixed oxide catalyst for CO2 methanation

Structure–function relationship during CO2 methanation over Rh/Al2O3 and Rh/SiO2 catalysts under atmospheric pressure conditions

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Resources

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Structure–function relationship during CO₂ methanation over Rh/Al₂O₃ and Rh/SiO₂ catalysts under atmospheric pressure conditions