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采用静态混晶法制备MCM-41/γ-Al2O3复合载体,并利用XRD、BET及Py-IR等方法对复合载体进行表征;以模型石脑油为原料,在固定床反应装置上评价以MCM-41/γ-Al2O3为载体的CoMo负载型催化剂的烯烃异构和加氢脱硫活性,考察制备过程中γ-Al2O3水和温度、模板剂用量、晶化温度、晶化时间等对复合载体中MCM-41结晶度及催化剂性能的影响.结果表明:当γ-Al2O3水合温度为135℃、晶化温度为125℃、晶化时间为24h、投料摩尔比为n(γ-Al2O3)∶n(SiO2)∶n(NaOH)∶n(CTAB)(十六烷基三甲基溴化铵)∶n(H2O)=0.06∶1.0∶0.3∶0.15∶90时,所得MCM-41/γ-Al2O3复合载体具有规整有序的介孔孔道、较大的比表面积(750m2/g)和比孔容(0.55cm3/g)及较窄的孔径分布(2~3nm),对应的CoMo/MCM-41-γ-Al2O3催化剂具有较优异的催化性能.磷(P)改性可有效增加载体的酸量和调节载体的酸分布;载体1%P(质量分数)改性可改善催化剂的异构和加氢脱硫性能.在温度为265℃、压力为1.5MPa、氢油体积比为300、空速为2h-1时,模拟原料油的异构化率、脱硫率分别为76.5%、96.5%.
The composite carrier was prepared by static mixed-crystallization method and the composite carrier was characterized by XRD, BET and Py-IR. The model naphtha was used as raw material to evaluate the mechanical properties of MCM-41 / γ- -41 / γ-Al2O3 as supported CoMo supported catalysts, the effects of γ-Al2O3 water and temperature, the amount of template agent, crystallization temperature, crystallization time and so on on the mechanical properties of the composite support The results show that when the hydration temperature of γ-Al2O3 is 135 ℃, the crystallization temperature is 125 ℃ and the crystallization time is 24h, the molar ratio of n (γ-Al2O3): n (γ-Al2O3) MCM-41 / γ-Al 2 O 3 composites were obtained when n (NaOH): n (CTAB) (cetyltrimethylammonium bromide): n (H 2 O) = 0.06:1.0:0.3:0.15:90 The mesoporous silica has the advantages of regular and ordered mesopores, larger specific surface area (750m2 / g), specific pore volume (0.55cm3 / g) and narrower pore size distribution (2-3nm) and corresponding CoMo / MCM- γ-Al2O3 catalyst has better catalytic performance.Phosphoric (P) modification can effectively increase the acidity of the carrier and adjust the acid distribution of the carrier; 1% P (mass fraction) carrier modification can improve the catalyst isomerization and Hydrodesulfurization performance at a temperature of 265 deg.] C, pressure was 1.5MPa, the hydrogen oil ratio was 300 by volume, the space velocity is 2h-1, the isomerization of the starting material simulation of oil, the desulfurization rate was 76.5%, 96.5%, respectively.