Mercury Adsorption and Oxidation over Cobalt Oxide Loaded Magnetospheres Catalyst from Fly Ash in Oxyfuel Combustion Flue Gas

详细信息    查看全文

• 作者：Jianping Yang ; Yongchun Zhao ; Lin Chang ; Junying Zhang ; Chuguang Zheng
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：July 7, 2015
• 年：2015
• 卷：49
• 期：13
• 页码：8210-8218
• 全文大小：459K
• ISSN：1520-5851

文摘

Cobalt oxide loaded magnetospheres catalyst from fly ash (Co鈥揗F catalyst) showed good mercury removal capacity and recyclability under air combustion flue gas in our previous study. In this work, the Hg<sup>0sup> removal behaviors as well as the involved reactions mechanism were investigated in oxyfuel combustion conditions. Further, the recyclability of Co鈥揗F catalyst in oxyfuel combustion atmosphere was also evaluated. The results showed that the Hg<sup>0sup> removal efficiency in oxyfuel combustion conditions was relative high compared to that in air combustion conditions. The presence of enriched CO<sub>2sub> (70%) in oxyfuel combustion atmosphere assisted the mercury oxidation due to the oxidation of function group of C鈥揙 formed from CO<sub>2sub>. Under both atmospheres, the mercury removal efficiency decreased with the addition of SO<sub>2sub>, NO, and H<sub>2sub>O. However, the enriched CO<sub>2sub> in oxyfuel combustion atmosphere could somewhat weaken the inhibition of SO<sub>2sub>, NO, and H<sub>2sub>O. The multiple capture鈥搑egeneration cycles demonstrated that the Co鈥揗F catalyst also present good regeneration performance in oxyfuel combustion atmosphere.