...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Catalysis science & technology >Influence of preparation method on supported Cu-Ni alloys and their catalytic properties in high pressure CO hydrogenation
【24h】

Influence of preparation method on supported Cu-Ni alloys and their catalytic properties in high pressure CO hydrogenation

机译：制备方法对高压CO氢化中支持的Cu-Ni合金及其催化特性的影响

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

Silica supported Cu-Ni (20 wt% Cu + Ni on silica, molar ratio of Cu/Ni = 2) alloys are prepared via impregnation, coprecipitation, and deposition-coprecipitation methods. The approach to co-precipitate the SiO2 from Na2SiO3 together with metal precursors is found to be an efficient way to prepare high surface area silica supported catalysts (BET surface area up to 322 m~2 g~(-1), and metal area calculated from X-ray diffraction particle size up to 29 m~2 g~(-1)). The formation of bimetallic Cu-Ni alloy nanoparticles has been studied during reduction using in situ X-ray diffraction. Compared to impregnation, the coprecipitation and deposition-coprecipitation methods are more efficient for preparation of small and homogeneous Cu-Ni alloy nanoparticles, In order to examine the stability of Cu-Ni alloys in high pressure synthesis gas conversion, they have been tested for high pressure CO hydrogenation (50 bar CO and 50 bar H2). These alloy catalysts are highly selective (more than 99 mol%) and active for methanol synthesis; however, loss of Ni caused by nickel carbonyl formation is found to be a serious issue. The Ni carbonyl formation should be considered, if Ni-containing catalysts (even in alloyed form) are used under conditions with high partial pressure of CO.
机译：二氧化硅支持的Cu-Ni（二氧化硅上的20 wt％Cu + Ni，Cu/Ni = 2的摩尔比）通过浸没，共沉淀和沉积重沉淀方法制备合金。发现从Na2SIO3与金属前体共沉淀SiO2的方法是准备高表面积二氧化硅支持的催化剂的有效方法（BET表面积（最高322 m〜2 g〜（-1），计算出的金属面积）从X射线衍射粒径到29 m〜2 g〜（-1））。在使用原位X射线衍射还原过程中，已经研究了双金属Cu-Ni合金纳米颗粒的形成。与浸渍相比，共沉淀和沉积重沉淀方法更有效地制备小型和均匀的Cu-Ni合金纳米颗粒，以便检查高压合成气体转化中Cu-Ni合金的稳定性，已对其进行高度测试，以进行高测试。压力CO氢化（50 bar CO和50 BAR H2）。这些合金催化剂具有高度选择性（超过99 mol％），并且用于甲醇合成。但是，发现由镍羰基造成的NI损失被发现是一个严重的问题。如果在具有较高的CO的高部分压力的条件下使用含Ni的催化剂（即使以合金形式）使用，则应考虑Ni羰基的形成。

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