• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Bulletin of the Korean Chemical Society >Production of Hydrogen and Carbon Nanotubes from Catalytic Decomposition of Methane over Ni:Cu/Alumina Modified Supported Catalysts
【24h】

Production of Hydrogen and Carbon Nanotubes from Catalytic Decomposition of Methane over Ni:Cu/Alumina Modified Supported Catalysts

机译：Ni：Cu /氧化铝修饰的负载型催化剂上甲烷催化分解制氢和碳纳米管

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

Hydrogen gas and carbon nanotubes along with nanocarbon were produced from commercial natural gas using fixed bed catalyst reactor system.The maximum amount of carbon(491 g/g of catalyst)formation was achieved on 25% Ni,3% Cu supported catalyst without formation of CO/CO2.Pure carbon nanotubes with length of 308 nm having balloon and horn type shapes were also formed at 673 K.Three sets of catalysts were prepared by varying the concentration of Ni in the first set,Cu concentration in the second set and doping with K in the third set to investigate the effect on stabilization of the catalyst and production of carbon nanotubes and hydrogen by copper and potassium doping.Particle size analysis revealed that most of the catalyst particles are in the range of 20-35 nm.All the catalysts were characterized using powder XRD,SEM/EDX,TPR,CHN,BET and CO-chemisorption.These studies indicate that surface geometry is modified electronically with the formation of different Ni,Cu and K phases,consequently,increasing the surface reactivity of the catalyst and in turn the Carbon nanotubes/H2 production.The addition of Cu and K enhances the catalyst dispersion with the increase in Ni loadings and maximum dispersion is achieved on 25% Ni:3% Cu/Al catalyst.Clearly,the effect of particle size coupled with specific surface geometry on the production of hydrogen gas and carbon nanotubes prevails.Addition of K increases the catalyst stability with decrease in carbon formation,due to its interaction with Cu and Ni,masking Ni and Ni:Cu active sites.
机译：使用固定床催化剂反应器系统从商业天然气中生产氢气，碳纳米管以及纳米碳。在25％Ni，3％Cu负载的催化剂上形成最大量的碳（491 g / g催化剂）形成而没有形成CO / CO2。在673 K下还形成了长308 nm的呈气球状和角型的纯碳纳米管。通过改变第一组中Ni的浓度，第二组中Cu的浓度和掺杂制备了三组催化剂第三组中的K用于研究铜和钾掺杂对催化剂稳定性以及碳纳米管和氢气生产的影响。颗粒尺寸分析表明，大多数催化剂颗粒在20-35 nm范围内。利用粉末XRD，SEM / EDX，TPR，CHN，BET和CO化学吸附对催化剂进行了表征。研究表明，表面几何形状会随着Ni，Cu和K不同相的形成而发生电子修饰。因此，增加了催化剂的表面反应性，进而增加了碳纳米管/ H2的产生。Cu和K的添加随着Ni含量的增加而增强了催化剂的分散性，并且在25％Ni：3％Cu / Al上实现了最大分散性显然，存在着粒度和特定的表面几何形状对氢气和碳纳米管生产的影响。添加K会增加催化剂的稳定性，并减少碳的形成，这是由于K与Cu和Ni相互作用，掩盖了Ni和Ni。 Ni：Cu活性位。

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