Hierarchical H-ZSM-5-supported cobalt for the direct synthesis of gasoline-range hydrocarbons from syngas: Advantages, limitations, and mechanistic insight

Sina Sartipi*, Kshitij Parashar, María José Valero-Romero, Vera P. Santos, Bart Van Der Linden, Michiel Makkee, Freek Kapteijn, Jorge Gascon Sabate

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

139 Scopus citations

Abstract

The main advantages and limitations of the use of mesoporous H-ZSM-5 as Co support in Fischer-Tropsch synthesis (FTS) are identified by combining a detailed catalyst performance evaluation with a thorough characterization. Mesostructures were created in H-ZSM-5 crystallites by demetalation via subsequent base and acid treatments. Desilication through base treatment provides H-ZSM-5 with pore sizes and volumes similar to amorphous SiO 2 (a conventional carrier), while acid treatment removes the produced extraframework aluminum and boosts the FTS catalyst activity. Model acid-catalyzed reactions and induced deactivation of zeolite acid sites confirm that hydrocracking of primary FTS hydrocarbons at the zeolite strongly increases the selectivity toward C5-C11 (gasoline fraction). On the other hand, the strong Co-zeolite interaction as revealed by TPR(H2) results in the stabilization of lower coordinated Co sites (as revealed by IR-assisted CO adsorption) and in a higher selectivity toward methane. n-Hexane conversion reactions suggest that the latter is due to increased activity for hydrogenation and hydrocarbon hydrogenolysis reactions at such coordinatively unsaturated Co sites.

Original languageEnglish (US)
Pages (from-to)179-190
Number of pages12
JournalJournal of Catalysis
Volume305
DOIs
StatePublished - Jun 21 2013

Keywords

  • Bifunctional catalyst
  • Cobalt
  • Fischer-Tropsch
  • H-ZSM-5
  • Hydrocracking
  • Mesoporous zeolite

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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