• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Symposium Proceedings vol.885; Symposium on Hydrogen Cycle-Generation, Storage and Fuel Cells; 20051128-1202; Boston,MA(US) >Silica Sol-Gel Supported Nickel Nano-Catalyst for Hydrogen Production Using Microreactors
【24h】

Silica Sol-Gel Supported Nickel Nano-Catalyst for Hydrogen Production Using Microreactors

机译：硅溶胶凝胶支持的镍纳米催化剂，用于使用微反应器生产氢气

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

The goal of this research is to investigate the activities of a non-noble nano-catalyst (Ni/SiO_2) using Si-microreactors for steam reforming of methanol to produce hydrogen for fuel cells. The silica supported catalyst was synthesized by sol-gel method using Ni (Ⅱ) nitrate and Si(C_2H_5O)_4 as starting materials. EDX results indicate that the actual loading of Ni (5-6%) is lower than the intended loading of 12%. The specific surface area of the silica sol-gel encapsulated Ni catalyst is 452 m~2/g with an average pore size of ～3 nm. STEM studies show Ni-particles size in the range of ～10 nm. Steam reforming reactions have been carried out in a microreactor with 50 μm wide channels in the temperature range of 180-240℃ and atmospheric pressure. The reaction results show 53% conversion of methanol with a selectivity of 74 % to hydrogen at 5 l/min and 200℃. The magnetic properties of Ni catalyst were performed using a Vibrating Sample Magnetometer (VSM) to study the activity of the catalyst before and after the steam reforming reactions. The VSM results indicate much higher activity of Ni catalyst in microreactor compared to that in macro-reactor, and Ni forms non-ferromagnetic species faster in the microreactor.
机译：这项研究的目的是研究使用硅微反应器对甲醇进行蒸汽重整以生产燃料电池氢的非贵金属纳米催化剂（Ni / SiO_2）的活性。以硝酸镍（Ⅱ）和Si（C_2H_5O）_4为起始原料，通过溶胶-凝胶法合成了二氧化硅负载的催化剂。 EDX结果表明，实际的Ni含量（5-6％）低于预期的12％。二氧化硅溶胶-凝胶包覆的镍催化剂的比表面积为452 m〜2 / g，平均孔径为〜3 nm。 STEM研究表明，镍粒子的尺寸在〜10 nm范围内。蒸汽重整反应是在具有50μm宽通道的微型反应器中在180-240℃的温度范围和大气压下进行的。反应结果表明，在5 l / min和200℃下，甲醇转化为氢气的转化率为53％，对氢的选择性为74％。使用振动样品磁强计（VSM）来执行Ni催化剂的磁性能，以研究蒸汽重整反应前后的催化剂活性。 VSM结果表明，与大型反应器相比，微反应器中Ni催化剂的活性高得多，并且Ni在微反应器中形成非铁磁性物质的速度更快。

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