Ni-Fe layered double hydroxide derived catalysts for non-plasma and DBD plasma-assisted CO2 methanation
Dominik WierzbickiM. Victoria MorenoStéphanie OgnierMonika MotakTeresa GrzybekPatrick Da CostaMaría Elena Gálvez
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Keywords:
Methanation
Layered double hydroxides
Nonthermal plasma
Temperature-programmed reduction
Coprecipitation
Thermal desorption spectroscopy
Bimetallic strip
Temperature-programmed reduction
Thermal desorption spectroscopy
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An X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption (TPD) and reduction (TPR) study of LaNiO3 and La2NiO4+δ perovskites has been carried out. The existence of at least two different forms of oxygen in these compounds is shown by both oxygen reactivity (TPD and TPR) and XPS characterisation. XP spectra have also revealed a surface enrichment in lanthanum and oxygen. TPR profiles have shown a reduction of LaNiO3 through the formation of La2Ni2O5 as an intermediate compound. Above 450 °C, LaNiO3 and intergrowth nickelates (La2NiO4 and La2NiO4 +δ) undergo a final reduction to metallic Ni and La2O3. Between 200 and 400 °C all three compounds exhibit a high catalytic activity in the total catalytic oxidation of methanol.
Thermal desorption spectroscopy
Temperature-programmed reduction
Lanthanum
Lanthanum oxide
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The CO2 methanation reaction of reduced and unreduced Ni based CeO2, Al2O3, TiO2 and Y2O3 supported catalysts was investigated. The Ni/CeO2 and Ni/Y2O3 catalysts exhibited similar CO2 conversions at all reaction temperatures. The catalysts were studied by X-ray diffraction (XRD), H2 chemisorption, H2 temperature-programmed reduction (TPR), and in situ diffuse reflection infrared Fourier transform spectroscopy (DRIFTS); the results suggested that the reducibility of both metal and support at low temperature, strong metal support interaction and small Ni particle size are important factors for low-temperature CO2 methanation. Based on the DRIFT studies, the difference in the CO2 adsorption properties and reaction pathway depending on the reduced and unreduced Ni based supported catalysts was discussed.
Methanation
Chemisorption
Temperature-programmed reduction
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Temperature-programmed reduction
Thermal desorption spectroscopy
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Thermogravimetric analysis
Temperature-programmed reduction
Thermal desorption spectroscopy
Thermogravimetry
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Temperature-programmed reduction
Thermal desorption spectroscopy
Characterization
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Abstract Successive temperature-programmed desorption (TPD) after temperature-programmed reduction (TPR) (Combined TPR-TPD) was performed in order to characterize supported platinum catalysts (Pt/SiO2, Pt/Al2O3, Pt/ZrO2 and Pt/TiO2) as well as to judge the validity of the apparent TPR profiles. In successive H2-TPD runs obtained after cooling in the absence of hydrogen from 450°C to room temperature, the hydrogen desorption peak was observed only for the Pt/TiO2 sample, indicating that the hydrogenic species were kept on Pt/TiO2 sample, while no hydrogenic species were retained on the other samples after TPR up to 450°C. For both Pt/Al2O3 and Pt/TiO2 samples, hydrogen spillover seemed to proceed. Hydrogen incorporation during TPR was greater for Pt/TiO2 than for the others. This hydrogen spillover causes an overestimation of the consumed H2/Pt value determined by the apparent TPR profile for Pt/TiO2. For Pt/SiO2 and Pt/ZrO2 samples, the apparent TPR profiles were mostly due to a reduction of the supported Pt oxides. For the Pt/TiO2 sample, the hydrogen incorporation/emission at different temperatures during TPR was investigated. To generate SMSI states, desorption of the spiltover hydrogen is suggested to play a significant role; the role of hydrogen incorporation/emission in the generation of SMSI states is also discussed.
Thermal desorption spectroscopy
Temperature-programmed reduction
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Thermal desorption spectroscopy
Temperature-programmed reduction
ZSM-5
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In recent years, carbon dioxide hydrogenation leading to synthetic fuels and value-added molecules has been proposed as a promising technology for stabilizing anthropogenic greenhouse gas emissions. Methanation or Sabatier are possible reactions to valorize the CO2. In the present work, thermal CO2 methanation and non-thermal plasma (NTP)-assisted CO2 methanation was performed over 15Ni/CeO2 promoted with 1 and 5 wt% of cobalt. The promotion effect of cobalt is proven both for plasma and thermal reaction and can mostly be linked with the basic properties of the materials.
Methanation
Nonthermal plasma
Carbon fibers
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This chapter contains sections titled: Introduction Temperature-Programmed Reduction Thermodynamics of Reduction Reduction Mechanisms Applications Temperature-Programmed Sulfidation Temperature-Programmed Reaction Spectroscopy Temperature-Programmed Desorption TPD Analysis Desorption in the Transition State Theory Temperature-Programmed Reaction Spectroscopy in UHV References
Thermal desorption spectroscopy
Temperature-programmed reduction
Sulfidation
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