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基于碱金属和过渡金属修饰铁矿石载氧体的煤催化燃烧

张思文 ,  沈来宏 ,  肖军 ,  顾海明 ,  宋涛

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引用本文: 张思文, 沈来宏, 肖军, 顾海明, 宋涛. 基于碱金属和过渡金属修饰铁矿石载氧体的煤催化燃烧[J]. 燃料化学学报, 2012, 40(10): 1179-1187. shu
Citation:  ZHANG Si-wen, SHEN Lai-hong, XIAO Jun, GU Hai-ming, SONG Tao. Catalytic combustion of coal using alkali and transition metals loaded on iron ore oxygen carrier[J]. Journal of Fuel Chemistry and Technology, 2012, 40(10): 1179-1187. shu

基于碱金属和过渡金属修饰铁矿石载氧体的煤催化燃烧

    通讯作者: 沈来宏(1965-),男,教授,主要研究方向为洁净煤燃烧、生物质能利用。E-mail:lhshen@seu.edu.cn,Tel:025-83795598,Fax:025-57714489。
  • 基金项目:

    国家自然科学基金(50976023)。 (50976023)

摘要: 煤气化反应是煤化学链燃烧过程的控制步骤,其反应速率慢。采用碱金属Na和过渡金属Ni对铁矿石载氧体进行修饰,在流化床反应器上研究了Na、Ni负载量和反应温度对煤化学链催化燃烧的影响。结果表明,在920℃时,Na-铁矿石的催化活性高于Ni-铁矿石,随着Na、Ni负载量的增加,煤化学链燃烧的反应速率加快,气体反应产物浓度达到峰值的时间缩短,反应后期气体产物的衰减速率变大,整个反应期间CO体积浓度明显减少,而CO2、H2体积浓度增大。当Na、Ni负载量均为6%时,两者进行比较分析,Ni在960℃时对煤化学链的催化燃烧效果最为显著,碳转化率高达92.7%,高于纯铁矿石约15.5%,而在800~920℃下,催化效果不明显;Na在800~960℃对煤气化反应的催化效果均较显著。SEM-EDX分析显示,反应结束后,Na-铁矿石载氧体表面Na盐流失严重,而Ni-铁矿石表面Ni盐负载较好。

English

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  • 收稿日期:  2012-03-27
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