Global CO2 recycling—novel materials and prospect for prevention of global warming and abundant energy supply

Hashimoto, Kôji; Yamasaki, Michiaki; Fujimura, Kaori; Matsui, Teppei; Izumiya, Koichi; Komori, M.; El‐Moneim, Ahmed Abd; Akiyama, Eiji; Habazaki, H.; Kumagai, Naokazu; Kawashima, A.; Asami, K.

doi:10.1016/s0921-5093(99)00092-1

Cited by 112 publications

(47 citation statements)

References 6 publications

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“…The formation of CH4 started between 200 and 250 °C, and the conversion of CO2 increased with rising temperature, reaching the highest value of 69% at 400 °C at a maximum selectivity towards Figure 2. Conversion of CO 2 (black), yield of CH 4 (red) and yield of CO (blue), as well as selectivity of CH 4 (green) for the 10 wt % Ni/Al 2 O 3 catalyst; conditions: stainless steel tubular fixed-bed reactor, 150 mg catalyst, H 2 /CO 2 = 4, 75% N 2 , p = 1 atm, T = 200-450 • C, gas hourly space velocity (GHSV) of 26,700 h −1 and weight hourly space velocity (WHSV) of 12,000 mL CO 2 /(g cat ·h).…”

Section: Preparation Characterization and Catalytic Performancementioning

confidence: 99%

“…The splitting of water to produce H 2 and the catalytic conversion of CO 2 to methane, alkanes, methanol or higher alcohols are the main steps to generate a chemical energy carrier [1][2][3][4]. Both steps need to withstand fluctuations in supplied electricity from wind and solar plants, which occur temporarily and fluctuate on a time scale of seconds to days.…”

Section: Introductionmentioning

confidence: 99%

“…The dynamics in the methanation originating from fast load changes of the H 2 supply are a key challenge [5] and are therefore the subject of present research. The catalytic methanation of CO 2 is well-known, and numerous articles can be found in the literature reporting CO 2 conversion and CH 4 selectivity under optimized and steady state conditions [9,10]. Ni-based catalysts generally achieve good activity.…”

Section: Introductionmentioning

confidence: 99%

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Surface Oxidation of Supported Ni Particles and Its Impact on the Catalytic Performance during Dynamically Operated Methanation of CO2

et al. 2017

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Abstract:The methanation of CO 2 within the power-to-gas concept was investigated under fluctuating reaction conditions to gather detailed insight into the structural dynamics of the catalyst. A 10 wt % Ni/Al 2 O 3 catalyst with uniform 3.7 nm metal particles and a dispersion of 21% suitable to investigate structural changes also in a surface-sensitive way was prepared and characterized in detail. Operando quick-scanning X-ray absorption spectroscopy (XAS/QEXAFS) studies were performed to analyze the influence of 30 s and 300 s H 2 interruptions during the methanation of CO 2 in the presence of O 2 impurities (technical CO 2 ). These conditions represent the fluctuating supply of H 2 from renewable energies for the decentralized methanation. Short-term H 2 interruptions led to oxidation of the most reactive low-coordinated metallic Ni sites, which could not be re-reduced fully during the subsequent methanation cycle and accordingly caused deactivation. Detailed evaluation of the extended X-ray absorption fine structure (EXAFS) spectra showed surface oxidation/reduction processes, whereas the core of the Ni particles remained reduced. The 300-s H 2 interruptions resulted in bulk oxidation already after the first cycle and a more pronounced deactivation. These results clearly show the importance and opportunities of investigating the structural dynamics of catalysts to identify their mechanism, especially in power-to-chemicals processes using renewable H 2 .

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Section: Preparation Characterization and Catalytic Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Surface Oxidation of Supported Ni Particles and Its Impact on the Catalytic Performance during Dynamically Operated Methanation of CO2

et al. 2017

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“…[1][2][3][4][5][6] Key materials necessary for this process are the anode and cathode for seawater electrolysis and the catalyst for CO 2 conversion into CH 4 . We have been tailoring these key materials.…”

Section: Introductionmentioning

confidence: 99%

Nanocrystalline Manganese-Molybdenum-Tungsten Oxide Anodes for Oxygen Evolution in Acidic Seawater Electrolysis

et al. 2005

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In an attempt to tailor new oxygen evolution anodes for acidic seawater electrolysis, manganese-molybdenum-tungsten oxide anodes were prepared by anodic deposition on IrO 2 /Ti substrate using 0. O 2þxþy electrodes were promising oxygen evolving anodes for acidic seawater electrolysis. It has been concluded that additions of both tungsten and molybdenum beneficially bring about an increase in the real electro-catalytic activity along with the formation of deposits with optimum thickness and good adherence to the IrO 2 /Ti substrate.

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“…[1][2][3][4][5][6][7] Global carbon dioxide recycling consists of power generation by solar cell on deserts, hydrogen production by seawater electrolysis at nearby desert coasts, and methane production by the reaction of hydrogen with carbon dioxide at the desert coasts. Because fresh water is not available at desert coasts, one of the key processes is seawater electrolysis by which we should produce hydrogen and oxygen on the cathode and the anode, respectively.…”

Section: Introductionmentioning

confidence: 99%

Anodically Deposited Mn-Mo-Fe Oxide Anodes for Oxygen Evolution in Hot Seawater Electrolysis

et al. 2003

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Global CO2 recycling—novel materials and prospect for prevention of global warming and abundant energy supply

Cited by 112 publications

References 6 publications

Surface Oxidation of Supported Ni Particles and Its Impact on the Catalytic Performance during Dynamically Operated Methanation of CO2

Surface Oxidation of Supported Ni Particles and Its Impact on the Catalytic Performance during Dynamically Operated Methanation of CO2

Nanocrystalline Manganese-Molybdenum-Tungsten Oxide Anodes for Oxygen Evolution in Acidic Seawater Electrolysis

Anodically Deposited Mn-Mo-Fe Oxide Anodes for Oxygen Evolution in Hot Seawater Electrolysis

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