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 language | American English |
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Pages (from-to) | 1363-1367 |
Number of pages | 5 |
Journal | ACS Catalysis |
Volume | 2 |
Issue number | 7 |
DOIs | |
State | Published - 6 Jul 2012 |
NREL Publication Number
- NREL/JA-5100-55687
Keywords
- biomass
- nickel
- regeneration
- sulfates
- sulfides
- XANES