Insights into the role of SO2 and H2O on the surface characteristics and de-N2O efficiency of Pd/Al2O3 catalysts during N2O decomposition in the presence of CH4 and O2 excess

Konsolakis, Michalis; Yentekakis, I.V.; Pekridis, G.; Kaklidis, N.; Psarras, A.C.; Marnellos, George

doi:10.1016/j.apcatb.2013.02.038

Cited by 33 publications

(22 citation statements)

References 46 publications

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“…H 2 O is the main components in industrial tail gas, so it is very important to investigate the effect of H 2 O on N 2 O decomposition. Many catalysts suffer from the inhibitory effect of H 2 O on the N 2 O decomposition reaction . In this work, the effect of H 2 O on N 2 O decomposition over the Co 0.6 Ti and Co 3 O 4 catalysts at 500 and 425 °C were studied, respectively.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Decomposition of N₂O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

Zhang

Sui

et al. 2016

ChemCatChem

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A series of CoxTi catalysts with different Co/Ti molar ratios (x=0.2, 0.4, 0.6, and 0.8) were prepared by the sol‐gel method and used for N2O decomposition. The catalysts were characterized by XRD, X‐ray photoelectron spectroscopy (XPS), TEM, temperature‐programmed reduction with H2, temperature‐programmed desorption of O2, diffuse reflectance UV/Vis, Raman spectra, and N2 adsorption–desorption measurements. The results indicate that the CoxTi catalysts possess high Brunauer–Emmett–Teller (BET) surface area, more surface Co3+, and even better structural stability than Co3O4 as a result of the strong interactions between Co and Ti oxide. Deactivation occurred over time for the Co3O4 catalyst, however, Co0.6Ti maintains nearly 100 % N2O conversion for at least 30 h. Moreover, the Co0.6Ti catalyst showed much stronger resistance against 1.5 vol. % O2, 2.4 vol. % H2O, or 1.6 vol. % NO in the feed compared with the Co3O4 catalyst. The excellent activity of the Co0.6Ti catalyst can be attributed to the higher amount of surface Co3+ derived from the interaction of the Co and Ti oxide in the CoxTi catalysts.

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Section: Resultsmentioning

confidence: 99%

Catalytic Decomposition of N₂O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

Zhang

Sui

et al. 2016

ChemCatChem

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“…Among them, noble-metal catalysts exhibit satisfactory activity at intermediate temperatures [11,12]. However, their high cost represents an important obstacle towards practical applications.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Decomposition of N2O over Cu–Zn/ZnAl2O4 Catalysts

et al. 2017

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Abstract:The catalytic decomposition of N 2 O was investigated over Cu-Zn/ZnAl 2 O 4 catalysts in the temperature range of 400-650 • C Catalytic samples have been prepared by wet impregnation method. Prepared catalysts were characterized using several techniques like BET surface area, X-ray diffraction (XRD), and Scanning electron microscopy (SEM). The Cu-Zn/ZnAl 2 O 4 showed higher catalytic performance along with long term stability during N 2 O decomposition. The Cu-Zn/ZnAl 2 O 4 catalysts yielded 100% N 2 O conversion at 650 • C. The Cu-Zn/ZnAl 2 O 4 catalysts are promising for decrease this strong greenhouse gas in the chemical industry.

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“…8b), a band at 1194 cm -1 was detected indicating bulk Al2(SO4)3 [33,34]. In addition, a band at 1468 cm -1 assigned to sulfur species on the palladium particles [36,37] was detected,…”

Section: Regenerated Catalystsmentioning

confidence: 98%

“…A band at 1468 cm -1 (Fig. 10b), indicating sulfur species on the palladium particles [36,37], disappears at higher temperatures. The unassigned band at 1560 cm -1 was found to follow the same trend.…”

Section: Regenerated Catalystsmentioning

confidence: 99%

Regeneration of sulfur-poisoned Pd-based catalyst for natural gas oxidation

Honkanen

Wang

Kärkkäinen

et al. 2018

Journal of Catalysis

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Sulfur deactivation and regeneration behavior of the Pd/Al2O3 catalyst has been investigated via experimental characterization and density functional theory (DFT) simulations. During the sulfur exposure, PdO crystallites grow slightly while bulk Al2(SO4)3 forms on the support. DFT calculations indicate that SOx species interact strongly with the catalyst surface making it chemically inactive in agreement with the experimental results. During the regeneration treatment (CH4 conditions), PdO particles reduce, Al2(SO4)3 is partially removed, and the activity for CH4 conversion is increased. No full recovery can be observed due to remaining Al2(SO4)3, the formation of encapsulating sulfur species, and the partial reduction of PdO particles. To reoxidize Pd, the catalyst is further regenerated (O2 conditions). The resulting CH4 conversion is at the same level than with the regenerated catalyst. Thus, a small amount of Al2(SO4)3 appears to have a stronger effect on the performance than the state of Pd.

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Insights into the role of SO2 and H2O on the surface characteristics and de-N2O efficiency of Pd/Al2O3 catalysts during N2O decomposition in the presence of CH4 and O2 excess

Cited by 33 publications

References 46 publications

Catalytic Decomposition of N₂O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

Catalytic Decomposition of N₂O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

Catalytic Decomposition of N2O over Cu–Zn/ZnAl2O4 Catalysts

Regeneration of sulfur-poisoned Pd-based catalyst for natural gas oxidation

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Insights into the role of SO2 and H2O on the surface characteristics and de-N2O efficiency of Pd/Al2O3 catalysts during N2O decomposition in the presence of CH4 and O2 excess

Cited by 33 publications

References 46 publications

Catalytic Decomposition of N2O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

Catalytic Decomposition of N2O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

Catalytic Decomposition of N2O over Cu–Zn/ZnAl2O4 Catalysts

Regeneration of sulfur-poisoned Pd-based catalyst for natural gas oxidation

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Product

Resources

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Catalytic Decomposition of N₂O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide

Catalytic Decomposition of N₂O over Co–Ti Oxide Catalysts: Interaction between Co and Ti Oxide