A1 Refereed original research article in a scientific journal
Can bi-functional nickel modified 13X and 5A zeolite catalysts for CO2 methanation be improved by introducing ruthenium?
Authors: Liangyuan Wei, Narendra Kumar, Wim Haije, Janne Peltonen, Markus Peurla, Henrik Grénman, Wiebren de Jong
Publisher: ELSEVIER
Publication year: 2020
Journal: Molecular Catalysis
Journal name in source: MOLECULAR CATALYSIS
Journal acronym: MOL CATAL
Article number: ARTN 111115
Volume: 494
Number of pages: 11
ISSN: 2468-8231
eISSN: 2468-8231
DOI: https://doi.org/10.1016/j.mcat.2020.111115
Self-archived copy’s web address: https://repository.tudelft.nl/islandora/object/uuid%3Ac50fba8d-29d1-49aa-9a00-3bd40c8d232a/datastream/OBJ/download
Abstract
Zeolites 13X and 5A were modified with nickel and/or ruthenium for CO2 methanation. The catalysts were prepared by evaporation impregnation and XRD, SEM-EDX, TEM, STEM-EDX, nitrogen physisorption, H-2-TPR and NH3-TPD were used to characterize the physico-chemical properties of the catalysts. The physico-chemical characterization results show that the zeolites structure did not change after the Ni, Ru modification, however. Ni was able to enter the pores of 13X, in the other case, 5A, an egg shell type structure was formed. Methanation experiments were performed in a lab scale fixed bed reactor system, the results showed that the mono-metallic catalysts out-performed the bi-metallic ones with Ni being the more active. One of the factors influencing the performance of the bi-metallic catalysts was the difficulty to obtain good dispersion when both metals were used. Also the morphology of the catalyst significantly influenced the selectivity. The catalysts with lower weak acidity benefit for getting a higher activity. The single metal catalysts 2.5 WoRu13X and 5%Ni13X showed good catalytic stability with around 97 % CH4 selectivity at 360 degrees C, with no catalyst deactivation during the 200 h catalyst stability test.
Zeolites 13X and 5A were modified with nickel and/or ruthenium for CO2 methanation. The catalysts were prepared by evaporation impregnation and XRD, SEM-EDX, TEM, STEM-EDX, nitrogen physisorption, H-2-TPR and NH3-TPD were used to characterize the physico-chemical properties of the catalysts. The physico-chemical characterization results show that the zeolites structure did not change after the Ni, Ru modification, however. Ni was able to enter the pores of 13X, in the other case, 5A, an egg shell type structure was formed. Methanation experiments were performed in a lab scale fixed bed reactor system, the results showed that the mono-metallic catalysts out-performed the bi-metallic ones with Ni being the more active. One of the factors influencing the performance of the bi-metallic catalysts was the difficulty to obtain good dispersion when both metals were used. Also the morphology of the catalyst significantly influenced the selectivity. The catalysts with lower weak acidity benefit for getting a higher activity. The single metal catalysts 2.5 WoRu13X and 5%Ni13X showed good catalytic stability with around 97 % CH4 selectivity at 360 degrees C, with no catalyst deactivation during the 200 h catalyst stability test.
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