反应温度及催化剂金属氧化物负载量对1-甲基萘加氢裂化制BTX反应性能的影响

以Beta分子筛为载体，采用浸渍法制备了一系列不同W、Ni金属氧化物负载量的加氢裂化催化剂。首先，采用XRD、N2吸附-脱附、TEM、NH3-TPD、Py-IR、UV-Vis DRS和H2-TPR等手段对制备催化剂的物化性质进行分析。结果表明：W、Ni金属氧化物配比和负载量的变化会影响催化剂加氢中心和酸中心的匹配。其次，以10%W-5%Ni/Beta（质量分数）分子筛作为催化剂，考察了反应温度对1-甲基萘加氢裂化制备苯/甲苯/二甲苯(BTX)选择性的影响，发现随着反应温度的提高(420~500 ℃)，BTX的选择性增加，证明高温有利于提高BTX的选择性。最后，考察了500 ℃条件下不同W、Ni金属氧化物负载量对加氢裂化生成BTX选择性的影响。结果表明：当反应温度500 ℃、氢/油体积比1300、反应压力6 MPa、25%W/Beta分子筛为催化剂时，BTX选择性和收率最高，其BTX摩尔收率高达84.62%。

Effect of Reaction Temperature and Metal Oxide Loadings of Catalysts on Catalytic Performance in 1-Methylnaphthalene Hydrocracking to BTX

A series of hydrocracking catalysts were prepared through impregnation method using Beta zeolite as carrier with different W-Ni loadings. Firstly, the physical-chemical properties of catalysts were characterized by XRD, N2 adsorption-desorption, TEM, NH3-TPD, Py-IR, UV-Vis DRS and H2-TPR. Results indicate that the change of the proportions and loadings of W and Ni metal oxides affects the matching between hydrogenation centers and the acid centers of the catalysts. Then the effect of reaction temperature on the selectivity of BTX in the hydrocracking of 1-methylnaphthalene was studied by using 10%W-5%Ni/Beta as catalyst. It is found that the selectivity of BTX is increasing with the increase of reaction temperature (420-500 ℃), which proves that high temperature is beneficial to improve the selectivity of BTX. Finally, the effect of different loadings of W and Ni metal oxides on the selectivity of BTX in hydrocracking at 500 ℃ was studied. Results show that when the reaction temperature of 500 ℃, the hydrogen/oil volume ratio of 1300, and the reaction pressure of 6 MPa, the BTX selectivity on the 25%W/Beta catalyst is the highest, with the BTX yield up to 84.62%.