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非水溶剂溶胶-凝胶法制备的纳米卤氧化镧在甲烷氧化偶联反应中的应用
  • ISSN号：0253-9837
  • 期刊名称：《催化学报》
  • 时间：0
  • 分类：O643[理学—物理化学;理学—化学]
  • 作者机构：[1]厦门大学化学化工学院,固体表面物理化学国家重点实验室,醇醚酯清洁化工国家工程实验室,福建厦门361005
  • 相关基金：国家重点基础研究发展计划（973计划 2010CB732303）; 国家自然科学基金（21033006 20923004 20373054）
作者： 侯玉慧[1], 常刚[1], 翁维正[1], 夏文生[1], 万惠霖[1]
关键词： 纳米, 卤氧化镧, 甲烷氧化偶联, 溶胶-凝胶, 非水溶剂, 低温活化, nanometer, lanthanum oxyhalide, oxidative coupling of methane, sol-gel, non-aqueous solvent, low temperature activation
中文摘要：

采用非水溶剂溶胶-凝胶法制备了具有四方晶体相结构的纳米LaOX（X=Cl,Br）.X射线粉末衍射和扫描电子显微镜结果表明,纳米LaOX样品的形貌规整、粒径均匀（平均粒径约为47nm）.在甲烷氧化偶联（OCM）反应中,纳米LaOX显示出比常规尺度LaOX更高的催化活性和C2选择性,且纳米LaOX具有良好的稳定性.此外,常规尺度下,LaOBr催化剂活性和C2选择性高于LaOCl;纳米尺度下,两催化剂活性相差不大,但LaOBr上C2选择性明显更高.

英文摘要：

LaOX （X = Cl, Br） nanoparticles with tetragonal crystal structure were successfully prepared via sol-gel approach with non-aqueous solvents. Characterizations by X-ray powder diffraction and scanning electronic microscopy show that the LaOX nanoparticles are regularly in shape and highly uniform in size with an average diameter of about 47 nm. For oxidative coupling of methane （OCM）, the nanosize LaOX catalysts have higher methane conversion and C2 selectivity than the LaOX catalysts with conventional size and show good stability in activity and selectivity during the catalyst life test at 650 °C. At conventional size, the methane conversion and C2 selectivity for OCM over the LaOBr catalyst are higher than that over the LaOCl catalyst, and at nanosize, there is not so much difference in methane conversion between LaOBr and LaOCl. However, the C2 selectivity for OCM reaction over LaOBr is significantly higher than that over LaOCl, especially at low temperature.

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期刊信息
  • 《催化学报》
  • 北大核心期刊（2011版）
  • 主管单位:中国科学院
  • 主办单位:中国化学会 中国科学院大连化学物理研究所
  • 主编：李灿 张涛
  • 地址：大连市沙河口区中山路457号
  • 邮编：116023
  • 邮箱：chxb@dicp.ac.cn
  • 电话：0411-84379240
  • 国际标准刊号：ISSN：0253-9837
  • 国内统一刊号：ISSN：21-1195/O6
  • 邮发代号:8-93
  • 获奖情况:
  • 第三届国家期刊奖提名奖,中国科协精品科技期刊示范项目
  • 国内外数据库收录:
  • 俄罗斯文摘杂志,美国化学文摘（网络版）,荷兰文摘与引文数据库,美国工程索引,美国剑桥科学文摘,美国科学引文索引（扩展库）,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊（2004版）,中国北大核心期刊（2008版）,中国北大核心期刊（2011版）,中国北大核心期刊（2014版）,英国英国皇家化学学会文摘,中国北大核心期刊（2000版）
  • 被引量:19199