Ni-Ce/Zeolites for CO2 Hydrogenation to CH4: Effect of the Metal Incorporation Order

M. Carmen Bacariza, Inês Graça, José M. Lopes, Carlos Henriques*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

The effect of the metal incorporation order used in the preparation of bimetallic ultrastable Y (USY) zeolite catalysts for CO 2 methanation has been studied. First, a Na-USY(3) zeolite was impregnated with 5 % of Ni and 3 % of Ce in three ways: Ni before Ce (Ce/Ni), Ce before Ni (Ni/Ce), and co-impregnation (Ni-Ce). Stronger interactions between Ni and Ce species are established when Ni is incorporated after or simultaneously with Ce, enhancing the reducibility of the Ni species and decreasing the Ni 0 average size to approximately 2.5 nm. However, the CO 2 adsorption capacity is smaller for the sample in which Ce is incorporated before Ni. Even though larger Ni 0 particles (13.3 nm) are formed when Ni is impregnated first, a good CO 2 adsorption capacity was also observed for this sample. Co impregnation was finally found as the best preparation method, the results being confirmed for an optimized USY catalyst in terms of Ni content, Si/Al ratio, and compensating cation.

Original languageEnglish
Pages (from-to)2773-2781
Number of pages9
JournalChemCatChem
Volume10
Issue number13
Early online date30 Apr 2018
DOIs
Publication statusPublished - 9 Jul 2018

Keywords

  • cerium
  • CO methanation
  • nickel
  • preparation method
  • zeolites

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