化工学报 ›› 2019, Vol. 70 ›› Issue (8): 2991-2999.DOI: 10.11949/0438-1157.20190269

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新型镍基镁渣催化重整松木热解挥发分焦油析出特性研究

刘阳(),刘捷成,俞海淼(),陈德珍   

  1. 同济大学机械与能源工程学院,上海 200092
  • 收稿日期:2019-03-21 修回日期:2019-06-03 出版日期:2019-08-05 发布日期:2019-08-05
  • 通讯作者: 俞海淼
  • 作者简介:刘阳(1994—),男,硕士研究生,sirsmile1010@163.com
  • 基金资助:
    国家自然科学基金项目(10002340092);国家重点研发计划项目(2017YFC0506004)

Characteristics of tar formation during catalytic reforming of pyrolysis volatile from pine saw dust over novel Ni-based magnesium slag catalyst

Yang LIU(),Jiecheng LIU,Haimiao YU(),Dezhen CHEN   

  1. College of Mechanical and Energy Engineering, Tongji University, Shanghai 200092, China
  • Received:2019-03-21 Revised:2019-06-03 Online:2019-08-05 Published:2019-08-05
  • Contact: Haimiao YU

摘要:

采用过量浸渍法制备了镍基镁渣催化剂,并在小型气流床气化炉上开展了松木热解挥发分的催化重整研究。评估了煅烧/催化温度、镍含量和水碳比对焦油组分的影响,同时在不同煅烧/催化温度下与Ni/γ-Al2O3催化剂进行了裂解焦油性能的对比。采用比表面积测试(BET)、X射线衍射(XRD)、扫描电镜(SEM)和透射电镜(TEM)对催化剂进行了表征。结果表明,当镍含量为3%,煅烧/催化温度为800℃,水碳比为0.5时,镍基镁渣催化剂表现出最优异的催化裂解焦油能力:大幅度降低了重质多环芳烃的相对含量,并且焦油转化率达到95.69%,同时焦油露点温度降至40.2℃。XRD结果表明,Ni、Fe、Ca、Mg相互作用可以形成多种活性中心,进而协同提高催化剂活性。

关键词: 生物质, 热解, 焦油, 催化作用, 镍, 镁渣

Abstract:

The nickel-based magnesium slag catalyst was prepared by excess impregnation method, and the catalytic reforming of pine pyrolysis volatiles was carried out on a small entrained flow gasifier. The effects of calcination/catalytic temperature, Ni content and steam to carbon (S/C) ratio on the catalytic performance were investigated. Moreover, the tar creaking capability of Ni/MS catalyst and Ni/γ-Al2O3 catalyst were explored under different calcination/catalytic temperatures. The catalysts were characterized by BET, XRD, SEM and TEM. The results indicated that the best tar conversion (95.69%) and the significant reduction in the relative content of heavy PAHs as well as the tar dew point of 40.2℃ were obtained over Ni/MS catalyst under the conditions of Ni content 3%, calcination/catalytic temperature 800℃, S/C = 0.5. Results from XRD showed that the interactions of Ni, Fe, Ca, and Mg formed multiple active centers to display synergistic catalytic effects, thereby jointly promoting catalyst activity.

Key words: biomass, pyrolysis, tar, catalysis, nickel, magnesium slag

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