• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Ammonia oxidation catalysis: Hydrogen cyanide, nitric oxide, and hydrogen.
【24h】

Ammonia oxidation catalysis: Hydrogen cyanide, nitric oxide, and hydrogen.

机译：氨氧化催化：氰化氢，一氧化氮和氢。

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

This thesis focuses on ammonia oxidation processes, specifically hydrogen cyanide synthesis and hydrogen generation. This work stemmed from previous investigations into hydrogen addition to ethane partial oxidation, which had revealed that the use of hydrogen with noble metal catalysts could give improved performance in oxidative dehydrogenation. Based on this discovery and simulations of ethylene synthesis reactions, it was hypothesized that hydrogen addition to the Andrussow process for hydrogen cyanide synthesis would also give superior results. By reacting hydrogen, ammonia, methane, and oxygen over a platinum/rhodium gauze catalyst in a millisecond contact time reactor, and then analyzing the product with a gas chromatograph, this hypothesis was tested. It was found that, as the amount hydrogen fed increased, so too did the hydrogen cyanide selectivity. However, the ammonia conversion decreased significantly over the same range, and as a result the overall yield decreased with increasing hydrogen fed.; Following these hydrogen cyanide synthesis experiments, work began on a project to generate hydrogen through ammonia reforming. Fuel cell technology necessitates a readily available, inexpensive source of hydrogen; many feel that this hydrogen can be obtained from ammonia. It was hoped that by catalytically oxidizing ammonia, large amounts of hydrogen could be produced at high ammonia conversions. By varying the ammonia/oxygen feed ratio, the catalyst used, and the reactor configuration, it was found that hydrogen yields in excess of 60% could be obtained at ammonia conversions of 99%. This product stream is suitable for use in a P.E.M. fuel cell.
机译：本文主要研究氨的氧化过程，特别是氰化氢的合成和氢的产生。这项工作源于以前对乙烷进行部分氧化中的氢的研究，该研究表明，将氢与贵金属催化剂一起使用可以提高氧化脱氢的性能。基于该发现和乙烯合成反应的模拟，可以假设将氢添加到用于氰化氢合成的Andrussow工艺中也会得到更好的结果。通过在毫秒接触时间反应器中使氢，氨，甲烷和氧在铂/铑纱布催化剂上反应，然后用气相色谱仪分析产物，验证了这一假设。发现随着氢气进料量的增加，氰化氢的选择性也增加。但是，氨转化率在相同范围内显着下降，结果，总产量随着氢气含量的增加而降低。在进行了这些氰化氢合成实验之后，开始了通过氨重整生成氢的项目的工作。燃料电池技术需要一种容易获得的廉价氢源。许多人认为这种氢可以从氨中获得。希望通过催化氧化氨，可以在高氨转化率下产生大量氢。通过改变氨/氧气进料比，使用的催化剂和反应器配置，发现在99％的氨转化率下可获得超过60％的氢气产率。该产品流适用于P.E.M.燃料电池。

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