H<i>β</i>/Al-SBA-15介微孔复合分子筛负载Ni-W催化剂对萘加氢裂化制BTX的催化性能

Hβ/Al-SBA-15介微孔复合分子筛负载Ni-W催化剂对萘加氢裂化制BTX的催化性能

摘要: 采用后合成法制备Hβ/Al-SBA-15复合分子筛，利用XRD、N₂吸附、Py-IR、NH₃-TPD、SEM和TEM等手段进行表征。用浸渍法将Ni-W活性组分担载在Hβ/Al-SBA-15载体上，制备Ni-W/Hβ/Al-SBA-15催化剂，以萘为模型化合物，考察该催化剂的加氢裂化性能。结果表明，所合成的Hβ/Al-SBA-15复合分子筛既有介孔结构又有微孔结构，并同时具有B酸和L酸中心，酸性强于SBA-15。具有适度酸性位和介微孔结构的Ni-W/Hβ/Al-SBA-15催化剂，对萘加氢裂化具有较高的萘转化率和BTX选择性，分别为96%和61.1%。

Abstract: Micro-mesoporous Hβ/Al-SBA-15 composite molecular sieves was prepared by post-synthesis method and characterized by XRD, N₂ sorption, Py-FTIR, NH₃-TPD, SEM and TEM. With the Hβ/Al-SBA-15 composite as support, Ni-W/Hβ/Al-SBA-15 catalyst was prepared through impregnation and its catalytic performance in the hydrocracking of naphthalene to BTX was investigated. The results verified that the Hβ/Al-SBA-15 composite are provided with both micropores and mesopores. Both Bronsted acid and Lewis acid sites are present on the surface of Hβ/Al-SBA-15 and its acidity is stronger than that of SBA-15. After loading Ni and W, the Ni-W/Hβ/Al-SBA-15 catalyst with moderate acidity and micro-mesoporous structure exhibits high activity in the hydrocracking of naphthalene to BTX; the conversion of naphthalene reaches 96%, with the selectivity of 61.1% to BTX.