Transformation of Sulfur Species during Steam/Air Regeneration on a Ni Biomass Conditioning Catalyst

Matthew M. Yung, Singfoong Cheah, Kimberly Magrini-Bair, John N. Kuhn

Research output: Contribution to journalArticlepeer-review

19 Scopus Citations

Abstract

Sulfur K-edge XANES identified transformation of sulfides to sulfates during combined steam and air regeneration on a Ni/Mg/K/Al2O 3 catalyst used to condition biomass-derived syngas. This catalyst was tested over multiple reaction/regeneration/reduction cycles. Postreaction catalysts showed the presence of sulfides on H2S-poisoned sites. Although H2S was observed to leave the catalyst bed during regeneration, sulfur remained on the catalyst, and a transformation from sulfides to sulfates was observed. Following the oxidative regeneration, the subsequent H2 reduction led to a partial reduction of sulfates back to sulfides, indicating the difficulty and sensitivity in achieving complete sulfur removal during regeneration for biomass-conditioning catalysts.

Original languageAmerican English
Pages (from-to)1363-1367
Number of pages5
JournalACS Catalysis
Volume2
Issue number7
DOIs
StatePublished - 6 Jul 2012

NREL Publication Number

  • NREL/JA-5100-55687

Keywords

  • biomass
  • nickel
  • regeneration
  • sulfates
  • sulfides
  • XANES

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