化工学报 ›› 2018, Vol. 69 ›› Issue (1): 405-413.DOI: 10.11949/j.issn.0438-1157.20170727

• 催化、动力学与反应器 • 上一篇    下一篇

基于镁铝水滑石的Mo/Al2O3-MgO催化剂制备及其加氢脱硫性能

岳源源1, 郑晓桂1, 康颖1, 白正帅1, 袁珮1, 朱海波1, 鲍晓军1,2   

  1. 1 福州大学石油化工学院, 化肥催化剂国家工程研究中心, 福建 福州 350002;
    2 福州大学能源与环境光催化国家重点实验室, 福建 福州 350116
  • 收稿日期:2017-06-05 修回日期:2017-08-02 出版日期:2018-01-05 发布日期:2018-01-05
  • 通讯作者: 鲍晓军
  • 基金资助:

    国家自然科学基金联合基金项目(U1462203);国家自然科学基金青年基金项目(21506034)。

Mo/Al2O3-MgO catalyst preparation from MgAl-hydrotalcite and their hydrogenation desulfurization performance

YUE Yuanyuan1, ZHENG Xiaogui1, KANG Ying1, BAI Zhengshuai1, YUAN Pei1, ZHU Haibo1, BAO Xiaojun1,2   

  1. 1 National Engineering Research Center of Chemical Fertilizer Catalyst, School of Chemical Engineering, Fuzhou University, Fuzhou 350002, Fujian, China;
    2 State Key Laboratory of Photocatalysis on Energy & Environment, Fuzhou University, Fuzhou 350116, Fujian, China
  • Received:2017-06-05 Revised:2017-08-02 Online:2018-01-05 Published:2018-01-05
  • Contact: 10.11949/j.issn.0438-1157.20170727
  • Supported by:

    supported by the Joint Funds of the National Natural Science Foundation of China(U1462203) and the Young Scientists Fund of the National Natural Science Foundation of China (21506034).

摘要:

生产低硫或无硫柴油是当今世界范围内清洁燃料发展的趋势,加氢脱硫(HDS)是大规模生产清洁柴油最为有效的技术之一,而研制高活性的HDS催化剂成为该技术的关键。以镁铝水滑石与氧化铝的复合氧化物为载体,通过等体积浸渍法制备了一系列Mo/Al2O3-MgO催化剂,以二苯并噻吩(DBT)的正庚烷溶液为原料,在固定床反应器上评价所得催化剂的HDS活性,考察了不同镁铝比的水滑石、焙烧温度和添加量对催化剂物化性质和催化性能的影响。研究结果表明,镁铝比、焙烧温度和添加量均影响催化剂的酸性、金属还原性、硫化性能和MoS2片晶的堆垛度等,当镁铝摩尔比为3、焙烧温度为800℃、成型时水滑石加入量为10%(质量分数)时,所制备催化剂的HDS活性最高,其脱硫率可达96.2%。这是由于该催化剂的酸性较适宜,活性组分与载体间的相互作用力适中,活性组分更易硫化,有助于提高MoS2片晶的堆垛度进而改善催化剂的HDS性能。

关键词: 镁铝水滑石, Mo/Al2O3-MgO, 催化剂, 加氢脱硫, 活性

Abstract:

Diesel production with low/no sulfur content is a major trend in world-wide development of clean fuels. Among many alternative technologies, hydrogenation desulfurization (HDS) is most effective to produce clean diesel at industrial scale, which development of highly active catalysts is the key. In this study, a series of Mo/Al2O3-MgO catalysts were prepared by metal oxide composites of MgAl-hydrotalcite and alumina as carriers with incipient-wetness impregnation method. Their catalytic performance was evaluated on dibenzothiophene (DBT) solution in n-heptane as raw material in a fixed-bed reactor. The results showed that Mg/Al molar ratio, calcination temperature, and additive amount all affected acidity, reduction and sulfidation of the catalysts and stacking degree of MoS2 crystallites. When Mg/Al molar ratio was 3, calcination temperature was 800℃, and hydrotalcite was 10% (mass), the obtained catalyst has the highest HDS activity with up to 96.2% desulfurization rate. Appropriate catalyst acidity and suitable interaction between active component and carrier make it easier to sulfide the active component, which is beneficial to improve stacking degree of MoS2 crystallites and enhance catalytic performance.

Key words: MgAl-hydrotalcite, Mo/Al2O3-MgO, catalyst, hydrogenation desulfurization, reactivity

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