...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Catalysis science & technology >Oxidative steam reforming of methane over nickel catalysts supported on Al2O3-CeO2-La2O3
【24h】

Oxidative steam reforming of methane over nickel catalysts supported on Al2O3-CeO2-La2O3

机译：在Al2O3-CEO2-LA2O3上支撑的镍催化剂上甲烷的氧化蒸汽重整

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

Nickel catalysts supported on Al2O3, Al2O3-CeO2, Al2O3-La2O3, and Al2O3-CeO2-La2O3 were synthesized via the sol-gel method in acidic solution. The influence of the chemical composition and textural properties of the catalysts on oxidative steam reforming of methane was studied. Methane, oxygen, nitrogen and steam were fed into a fixed bed reactor and tested under atmospheric pressure at 550 degrees C, with O/C ratio = 0.3, S/C ratio = 1.0, and WHSV = 170.8 h(-1). During 6 h of reaction, methane conversion and hydrogen selectivity were determined. Although lanthanide oxides are known to have excellent features, the addition of ceria or lanthana did not improve the catalytic performance of the Ni/Al2O3 system. Nevertheless the addition of both dopants was needed to end up with a stable catalyst. Characterization results revealed a low crystallite size (40 angstrom), a high fraction of accessible Ni-0 species (73.6%), migration of nickel and ceria from the bulk to the surface during activity tests, and a very low amount of coke deposited (4.7 mg C per g catalyst) on the Ni/Al2O3-CeO2-La2O3 catalyst that resulted in high catalytic activity.
机译：通过酸性溶液中的SOL-GEL方法合成了Al2O3，Al2O3-CEO2，Al2O3-LA2O3和Al2O3-CEO2-LA2O3的镍催化剂。研究了催化剂的化学成分和质地性能对甲烷的氧化蒸汽重整的影响。甲烷，氧，氮和蒸汽被喂入固定的床反应器中，并在550摄氏度下在大气压下进行测试，O/C比= 0.3，S/C比= 1.0，WHSV = 170.8 h（-1）。在反应的6小时内，确定甲烷转化率和氢选择性。尽管众所周知，灯笼氧化物具有出色的特征，但添加二氧化碳或灯笼并不能改善Ni/Al2O3系统的催化性能。然而，需要添加两个掺杂剂才能获得稳定的催化剂。表征结果表明，在活动测试期间，镍和陶瓷从大量迁移到表面的较低的结晶石大小（40埃埃斯特罗姆），可访问的Ni-0物种的高分子（73.6％），以及非常低的可口可乐（可口可乐）（ 4.7 mg c/g催化剂）在Ni/Al2O3-CEO2-LA2O3催化剂上产生高催化活性。

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