...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Catalysis science & technology >Things go better with coke: the beneficial role of carbonaceous deposits in heterogeneous catalysis
【24h】

Things go better with coke: the beneficial role of carbonaceous deposits in heterogeneous catalysis

机译：事情更好的与可口可乐:的有益作用碳质沉积在多相催化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Carbonaceous or hydrocarbonaceous deposits formed on the surface of heterogeneous catalysts during reaction are typically associated with catalyst deactivation through coking. However, there are a number of cases where such deposits may enhance catalytic performance. This includes: coke deposits acting directly as the catalytically active site, e.g. in alkane dehyrogenation reactions; the selective deactivation of nonselective surface sites thereby increasing catalytic selectivity; and the participation of deposits in the reaction mechanism, including hydrogen and hydrocarbon transfer and the well-documented hydrocarbon pool in methanol-to-hydrocarbon conversion. The in situ formation of metal carbides also plays a key role in many reactions including alkyne hydrogenation and Fischer-Tropsch synthesis. These phenomena have been observed over all solid catalyst types including supported metals and metal oxides and zeolites. It is highly likely that there are many systems in which coke plays a positive role which have not yet been reported due to difficulties in deconvolving this from the role coke plays in deactivation. This review summarises the, at present disparate, literature in this important area and highlights how this understanding can be used to inform the rational design of catalysts and catalytic processes.
机译：含碳或含烃形成的存款在异构催化剂的表面反应通常与催化剂相关联通过炼焦失活。数量的情况下,这种存款可能增强催化性能。存款代理直接催化地活性部位,如烷烃dehyrogenation反应;非选择性表面从而增加网站催化选择性;存款的反应机理,包括氢和碳氢化合物和转移证据确凿的烃池methanol-to-hydrocarbon转换。金属碳化物的形成也起着关键作用在许多包括炔加氢的反应和费托合成。曾被观察到在所有固体催化剂类型包括金属和金属氧化物和支持沸石。系统中,可口可乐发挥了积极作用尚未报道由于困难吗deconvolving从可口可乐在扮演的角色失活。现在的不同,文学在这一重要地区,突显出这可以理解用来通知设计合理的催化剂和催化过程。

著录项

相似文献

  • 外文文献
  • 中文文献
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