无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (5): 121-127.doi: 10.19964/j.issn.1006-4990.2022-0714

• 催化材料 • 上一篇    下一篇

S-1分子筛羟基窝锚定钴用于丙烷脱氢制丙烯

贾育红1,2(), 胡忠攀1(), 王坤院1(), 韩晶峰1, 魏迎旭1, 刘中民1   

  1. 1.中国科学院大连化学物理研究所,低碳催化技术国家工程研究中心,辽宁 大连 116023
    2.中国科学院大学,北京 100049
  • 收稿日期:2022-12-05 出版日期:2023-05-10 发布日期:2023-05-15
  • 通讯作者: 胡忠攀(1990— ),男,博士,助理研究员,从事分子筛和金属-分子筛催化研究;E-mail:huzp@dicp.ac.cn
    王坤院(1973— ),男,博士,副研究员,硕士生导师,从事分子筛催化研究;E-mail:kywang@dicp.ac.cn
  • 作者简介:贾育红(1998— ),女,硕士研究生,从事烷烃转化研究;E-mail:jiayuhong@dicp.ac.cn
  • 基金资助:
    国家重点研发计划项目(2022YFE0116000);国家自然科学基金(22202193);中国博士后基金(2019M661147);中国科学院青年创新促进会(2021182);大连化物所创新基金(DICP I202217)

Co anchored on silanol nests of S-1 zeolite for propane dehydrogenation to propylene

JIA Yuhong1,2(), HU Zhongpan1(), WANG Kunyuan1(), HAN Jingfeng1, WEI Yingxu1, LIU Zhongmin1   

  1. 1. National Engineering Research Center of Lower-Carbon Catalysis Technology,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China
    2. University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2022-12-05 Published:2023-05-10 Online:2023-05-15

摘要:

以全硅MFI分子筛(S-1)为载体,采用简单的浸渍法制备了不同钴(Co)含量的Co/S-1催化剂并应用于丙烷脱氢反应。利用X射线衍射(XRD)、氮气吸附-脱附、傅里叶变换红外光谱(FT-IR)等技术对Co/S-1进行表征。结果表明,Co负载在S-1载体上并与S-1的Si—OH反应生成单位点Co物种和超小的Co纳米团簇,这些物种是丙烷脱氢的主要活性中心。Co的负载量对丙烷脱氢影响很大,当负载量较低时,活性Co物种较少,丙烷脱氢性能较差;当负载量较高时,Co物种会团聚成大颗粒不利于丙烷脱氢反应。通过优化制备条件,发现当Co负载量为1%(质量分数)时,Co/S-1的丙烷脱氢性能最优,循环使用5次后丙烷转化率、丙烯选择性和丙烯产率均未出现明显的下降。

关键词: Co/S-1催化剂, 丙烷脱氢, 丙烯, 活性中心, 构效关系

Abstract:

Co/S-1 catalysts with different cobalt(Co) contents were prepared by a simple impregnation method using pure silica MFI zeolite(S-1) as carrier and applied to the dehydrogenation of propane.Co/S-1 was characterized by X-ray diffraction(XRD),nitrogen adsorption desorption,and Fourier transform infrared spectroscopy(FT-IR).The results showed that Co was loaded on the S-1 carrier and reacted with the Si—OH of S-1 to form unit point Co species and ultra small Co nanoclusters,which were the main active centers for propane dehydrogenation.The loading amount of Co had a significant impact on propane dehydrogenation.When the loading amount was low,there were fewer active Co species and propane dehydrogenation performance was poor.When the loading amount was high,the Co species would agglomerate into large particles,which was not conducive to the propane dehydrogenation reaction.By optimizing the preparation conditions,it was found that when the Co loading amount was 1%(mass fraction),the propane dehydrogenation performance of Co/S-1 was optimal.After 5 cycles of recycling,there was no significant decrease in propane conversion,propylene selectivity,and propylene yield.

Key words: Co/S-1 catalyst, propane dehydrogenation, propylene, active sites, structure-activity relationship

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