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

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