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

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• 作者：Matthew M. Yung ; Singfoong Cheah ; Kimberly Magrini-Bair ; John N. Kuhn
• 刊名：ACS Catalysis
• 出版年：2012
• 出版时间：July 6, 2012
• 年：2012
• 卷：2
• 期：7
• 页码：1363-1367
• 全文大小：238K
• 年卷期：v.2,no.7(July 6, 2012)
• ISSN：2155-5435

文摘

Sulfur K-edge XANES identified transformation of sulfides to sulfates during combined steam and air regeneration on a Ni/Mg/K/Al₂O₃ 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.

Keywords:

XANES; nickel; biomass; sulfates; sulfides; regeneration