催化学报 ›› 2014, Vol. 35 ›› Issue (12): 1955-1971.DOI: 10.1016/S1872-2067(14)60171-6

• 论文 • 上一篇    下一篇

表面活性剂辅助共沉淀法制备Ni-Mg-Al固体碱催化剂用于CH4-CO2重整反应

谭鹏甲a,b, 高志华a, 沈朝峰c, 杜亚丽a, 李晓东a, 黄伟a   

  1. a. 太原理工大学煤科学与技术教育部和山西省重点实验室, 山西太原030024;
    b. 中国航天科工集团第六研究院389厂, 内蒙古呼和浩特010010;
    c. 华电电力科学研究院, 浙江杭州310027
  • 收稿日期:2014-04-27 修回日期:2014-07-01 出版日期:2014-11-29 发布日期:2014-11-29
  • 通讯作者: 黄伟, 高志华
  • 基金资助:

    国家高技术研究发展计划(863计划, 2013AA051201).

Ni-Mg-Al solid basic layered double oxide catalysts prepared using surfactant-assisted coprecipitation method for CO2 reforming of CH4

Pengjia Tana,b, Zhihua Gaoa, Chaofeng Shenc, Yali Dua, Xiaodong Lia, Wei Huanga   

  1. a. Key Laboratory of Coal Science and Technology, Ministry of Education of China and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;
    b. The 389 Plant of the Sixth Academy of China Aerospace Science & Industry Corporation, Hohhot 010010, Inner Mongolia, China;
    c. Huadian Electric Power Research Institute, Hangzhou 310027, Zhejiang, China
  • Received:2014-04-27 Revised:2014-07-01 Online:2014-11-29 Published:2014-11-29
  • Supported by:

    This work was supported by the National High Technology Research and Development Program of China (863 Program, 2013AA051201).

摘要:

采用表面活性剂辅助共沉淀法制备了Ni-Mg-Al固体碱催化剂并用于CH4-CO2重整反应, 探讨了表面活性剂对Ni(111), Ni(200)晶面的择优取向作用, 在800 ℃下比较了不同表面活性剂制备的催化剂的催化性能, 详细考察了CTAB制备的催化剂CB-LDO在不同反应温度下的催化活性和稳定性.采用红外光谱、X射线衍射、程序升温还原、X射线光电子能谱、高分辨透射电镜和程序升温氧化等表征手段分析了催化剂的活性、稳定性和失活原因.结果表明, 四丙基氢氧化铵(TPAOH)促进Ni(200)的生长, 而聚氧乙烯-聚氧丙烯-聚氧乙烯(P123)、聚乙烯吡咯烷酮(PVP)和十六烷基三甲基溴化铵(CTAB)抑制Ni(200)晶面的生长;Ni(200)的结晶程度对CH4的活化起到关键的作用, 催化剂CB-LDO在高温下反应会发生晶型的转化, Ni(200)晶面由于反应过程中生成NiAl2O4尖晶石而得到缓慢释放, 使催化剂的活性得以维持较高的水平.

关键词: 表面活性剂, 共沉淀法, 镍, 镁铝氧化物, 甲烷, 二氧化碳, 重整

Abstract:

Ni-Mg-Al solid basic catalysts for CO2 reforming of CH4 were prepared using a surfactant-assisted coprecipitation method. The preferred orientations of the surfactants on the Ni(111) and Ni(200) crystal planes were investigated. The catalytic performance of the surfactant-modified catalysts was tested at 800 ℃. The cetyltrimethylammonium bromide (CTAB)-modified catalyst (CB-LDO; LDO = layered double oxide) was further studied at various reaction temperatures. All the catalysts were characterized using Fourier-transform infrared spectroscopy, X-ray diffraction, temperature- programmed reduction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and temperature-programmed oxidation. The results show that growth of the Ni(200) plane is promoted by tetrapropylammonium hydroxide and restrained by P123, PVP, and CTAB. The crystallinity degree of Ni(200) plays a key role in the activation of CH4. The CB-LDO catalysts retain high activities and stabilities, because of the crystal phase transformation at high temperature during the reaction; this leads to the formation of spinel NiAl2O4 and exposure of the Ni(200) crystal plane.

Key words: Surfactant, Coprecipitation method, Nickel, Magnesium aluminum oxide, Methane, Carbon dioxide, Reforming