...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Catalysis science & technology >Attrition-resistant Ni-Mg/Al2O3 catalyst for fluidized bed syngas methanation
【24h】

Attrition-resistant Ni-Mg/Al2O3 catalyst for fluidized bed syngas methanation

机译：耐损耗的Ni-Mg/Al2O3催化剂用于流化床合成剂甲基化

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

Spray granulation was applied to prepare attrition-resistant Ni-Mg/Al2O3 catalysts for fluidized bed methanation. The tested binders included alumina sol (AS, pH = 4.0), acidic silica sol (SS, pH = 3.0), alumina-modified silica sol (AM, pH = 8.7) and alkaline silica sol (CC, pH = 9.6). By air-jet attrition test it was found that the attrition strength of the resulting catalysts followed an order of C-SS > C-AM > C-AS > C-CC, here C-SS, as an example, refers to the catalyst using SS as the binder. Characterization shows that the higher the volume of pores above 20 nm, the less attrition resistance of the catalyst there was, especially for catalysts using silica binders, whose high particle density was also beneficial to improving the attrition resistance of the catalyst. Syngas methanation over the catalysts in a fluidized bed at 2.5 MPa clarified an activity order of C-AS > C-SS > C-AM approximate to C-CC at 623-923 K. The AS binder enabled highly dispersed metallic Ni and many surface active sites for methanation reactions. Continuous methanation for 20 h at 900 K and 2.5 MPa verified the stability of the catalysts using the AS, SS and CC binders, but the activity clearly decreased over C-AM. Analyzing the spent catalysts via TPO demonstrated that a high amount of inactive carbon on C-AM caused its deactivation in the 20 h test.
机译：将喷雾颗粒施加用于制备耐磨的Ni-MG/Al2O3催化剂，以用于流化的床甲基化。测试的粘合剂包括氧化铝（AS，pH = 4.0），酸性二氧化硅溶胶（SS，pH = 3.0），氧化铝修饰的二氧化硅溶胶（AM，pH = 8.7）和碱性二氧化硅溶胶（CC，pH = 9.6）。通过空气喷气测试，发现所得催化剂的损耗强度遵循C-SS> C-AM> C-AS> C-AS> C-CC的顺序，此处为C-SS，例如催化剂使用SS作为粘合剂。表征表明，高于20 nm的孔的体积越高，催化剂的损耗较小，尤其是对于使用二氧化硅粘合剂的催化剂，其高颗粒密度也有助于改善催化剂的损耗耐药性。在2.5 MPa的流化床中催化剂上的合成剂量阐明了C-AS> C-SS> C-SS> C-AM的活性顺序在623-923 K处近似于C-CC。甲基化反应的活性位点。连续甲烷在900 K和2.5 MPa处使用20小时，使用AS，SS和CC粘合剂验证了催化剂的稳定性，但该活性在C-AM上明显降低。通过TPO分析用过的催化剂表明，在C-AM上，大量的无活性碳在20小时测试中导致其失活。

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