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  

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

作　　者：刘阳 刘捷成 俞海淼[1] 陈德珍[1] LIU Yang;LIU Jiecheng;YU Haimiao;CHEN Dezhen(College of Mechanical and Energy Engineering, Tongji University, Shanghai 200092, China)

机构地区：[1]同济大学机械与能源工程学院

出　　处：《化工学报》2019年第8期2991-2999,共9页CIESC Journal

基　　金：国家自然科学基金项目(10002340092);国家重点研发计划项目(2017YFC0506004)

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。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.

关 键 词：生物质 热解 焦油 催化作用 镍 镁渣 

分 类 号：TK6[动力工程及工程热物理—生物能]