Supported cobalt catalysts by one-pot aqueous combustion synthesis for catalytic phenol degradation

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• 作者：Hongqi Sun^a ; Hanwen Liang^a ; ^b ; Guanliang Zhou^a ; Shaobin Wang^a ; ^{Shaobin.wang@curtin.edu.au}
• 关键词：Aqueous combustion synthesis ; Glycine fuel ; Supported Co oxide ; Phenol degradation
• 刊名：Journal of Colloid and Interface Science
• 出版年：2013
• 出版时间：15 March, 2013
• 年：2013
• 卷：394
• 期：Complete
• 页码：394-400
• 全文大小：548 K

文摘

Cobalt oxides (Co) and Al₂O₃-, SiO₂-, and TiO₂-supported cobalt oxide catalysts were prepared by an aqueous combustion method using urea and glycine as fuels. Their catalytic performance in activation of OXONE? for phenol degradation in aqueous solution was investigated. It was found that unsupported Co oxide and supported Co oxide presented different mechanisms in activation of OXONE? for phenol degradation. The supported Co catalysts presented higher activity in activation of OXONE? for phenol degradation due to higher dispersion of Co₃O₄ on the supports and Co(II) coordination sites. The major oxidizing radicals were identified to be by competitive radical reactions. The Co oxides synthesized from urea or glycine showed a similar activity; however, the supported Co catalysts prepared by glycine fuel exhibited better activity than those prepared by urea. For Al₂O₃-, SiO₂-, and TiO₂-supported Co catalysts, Co/TiO₂ presented a higher activity in phenol degradation compared with Co/SiO₂ and Co/Al₂O₃. But, Co/SiO₂ showed the best stability among the catalysts. Total organic carbon could be reduced by 80 % , 72 % , and 45 % on Co/TiO₂, Co/SiO₂, and Co/Al₂O₃, respectively, at 30 ppm phenol. Phenol degradation was found to follow the zero-order kinetics. The causes of deactivation were investigated, and the regeneration methods were proposed.