• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Importance of volatile AAEM species to char reactivity during volatile–char interactions
【24h】

Importance of volatile AAEM species to char reactivity during volatile–char interactions

机译：挥发性-AA相互作用过程中挥发性AAEM物种对炭反应性的重要性

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The volatile alkali and alkaline earth metallic (AAEM) species are an important component of the involved reactants during volatile–char interactions and are beneficial to char reactivity. A fluidized-bed/fixed-bed combination reactor was employed to investigate the effects of volatile AAEM species on the char reactivity at 800 °C. ICP-OES and X-ray Photoelectron Spectroscopy (XPS) were utilized to reveal the evolution of AAEM species and char structures during volatile–char interactions. The results indicate that a large proportion of volatile AAEM species would migrate onto the char substrate, amounting to over 50% of the volatilization amount of AAEM species derived from char during volatile–char interactions. Concentrations of AAEM species accord well with the oxygen atomic concentrations on the char surface. The volatile AAEM species migrated onto the char would bond with the oxygen preferentially, likely to stabilize the oxygen-containing structures. The reactivity of the char reacted with the volatile loading of AAEM species is about two times higher than that reacted with the volatile free-of-AAEM species. It is believed that the volatile AAEM species show a better catalytic activity than the residual AAEM species in original char, possibly due to the more stable bonds between volatile AAEM species and the char matrix, or the better dispersion of volatile AAEM species in char. The conclusions clearly demonstrate that the volatile AAEM species play a significant role in the char reactivity.
机译：挥发性碱金属和碱土金属（AAEM）物种是挥发性-炭相互作用期间涉及的反应物的重要组成部分，并有利于炭反应性。采用流化床/固定床组合反应器研究挥发性AAEM物质对800°C时焦炭反应性的影响。 ICP-OES和X射线光电子能谱（XPS）用于揭示挥发物-炭相互作用中AAEM种类和炭结构的演变。结果表明，很大一部分挥发性AAEM物质会迁移到炭基质上，占挥发性-炭相互作用中源自炭的AAEM物质挥发量的50％以上。 AAEM物质的浓度与炭表面上的氧原子浓度非常吻合。迁移到炭上的挥发性AAEM物质将优先与氧键合，可能使含氧结构稳定。与AAEM种类的挥发性负载反应的炭的反应性比与不含AAEM种类的挥发性反应的炭的反应性高约两倍。据信，挥发性AAEM物质比原始炭中的残余AAEM物质表现出更好的催化活性，这可能是由于挥发性AAEM物质与炭基质之间的键更稳定，或者挥发性AAEM物质在炭中的分散性更好。结论清楚地表明，挥发性AAEM物质在炭反应性中起重要作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号