Abstract

Nano γ-Al₂O₃ support was prepared by sol-gel method, and the Mg₂Si/γ-Al₂O₃ catalyst was prepared by impregnation method from Mg₂Si and the γ-Al₂O₃ support. The catalyst was characterized by X-ray diffraction, N₂ adsorption-desorption, scanning electron microscopy and CO₂ temperature-programmed desorption analysis. The catalytic hydrocracking of lignite-related modelcompounds, 1-methoxynaphthalene (1-MON) and bibenzyl ether (BE), was investigated. Mg₂Si was well distributed on the surface and in the voids of γ-Al₂O₃ support. The Mg₂Si/γ-Al₂O₃ catalyst had high specific surface area, large amount of mesopores, strong basicity, and exhibited high catalytic efficiency in hydrocracking of 1-MON and BE due to the synergic effect between Mg₂Si and γ-Al₂O₃. Under an initial hydrogen pressure of 3 MPa and reaction time of 60 min, the conversion of 1-MON and BE reached 100% when the reaction temperatures were 225 and 175°C, respectively. The selectivities for naphthalene and toluene were close to 100%, only traces of the hydrogenated products were detected. After 4 cycle tests, the catalytic activity of Mg₂Si/γ-Al₂O₃ catalystdropped to 50%.

中文翻译：

---

Mg2Si/γ-Al2O3催化剂上-CO桥键的催化加氢裂化

摘要

采用溶胶-凝胶法制备纳米γ-Al ₂ O _{3载体，以Mg 2} Si和γ-Al ₂ O _{3载体为原料，采用浸渍法制备Mg 2} Si/γ-Al ₂ O ₃催化剂。通过X射线衍射、N ₂吸附-脱附、扫描电子显微镜和CO ₂程序升温脱附分析对该催化剂进行了表征。研究了褐煤相关模型化合物 1-甲氧基萘 (1-MON) 和联苄醚 (BE) 的催化加氢裂化。Mg _{2 Si 很好地分布在 γ-Al 2} O ₃的表面和空隙中支持。Mg ₂ Si/γ-Al ₂ O ₃催化剂具有高比表面积、大量中孔、强碱性，由于Mg ₂ Si和γ的协同作用，在1-MON和BE的加氢裂化中表现出较高的催化效率。 -Al ₂ O ₃。在3 MPa的初始氢气压力和60 min的反应时间下，当反应温度分别为225和175°C时，1-MON和BE的转化率分别达到100%。萘和甲苯的选择性接近 100%，仅检测到微量的氢化产物。经过4次循环测试，Mg ₂ Si/γ-Al ₂ O _{3的催化活性}催化剂降至 50%。