NiY/MCM-41催化剂的制备及催化氧化脱硫研究

Preparation of Ni-Y/MCM-41 catalyst and its catalytic oxidation desufurization performance

采用后合成法制备复合分子筛Y/MCM-41,并以其为载体,用活性组分硝酸镍对其改性,制备Ni-Y/MCM-41催化剂,并利用XRD、BET、N2吸附-脱附对其进行表征。结果表明,复合分子筛同时具有微孔分子筛Y沸石和介孔材料MCM-41分子筛的特征。以硫质量分数为300μg/g的模拟油进行催化氧化脱硫实验,考察了Ni离子的负载量、反应温度、反应时间、催化剂用量、氧化剂用量等工艺条件对脱硫率的影响。结果表明:硝酸镍的负载量为10%,模拟油用量为20 m L,反应温度为70℃,反应时间为80 min,剂油比(催化剂与模拟油的质量比)为1∶70,V(H2O2)/V(油)=0.03时,脱硫率可达86.53%。

Under the hydrothermal condition, the Y/MCM-41 composite molecular sieve is synthesized by post- synthesis method. The Ni-Y/MCM-41 catalyst is prepared by loading different ratio of active component Ni on Y/MCM- 41 composite supports, and characterized by XRD, BET and N2 adsorption. It is found that Y/MCM-41 composite molecular sieve exhibits the properties of both mieroporous Y and mesoporous MCM-41. The effects of the proportion of Ni ion, reaction temperature, react time, amount of catalyst, dosage of oxidant and other process conditions on the desulfurization rate are investigated by the catalytic oxidative desulfurization method using model oil （300 p^g/g） as the raw material. The results show that the desufurization rate can reach 86. 53% under the following conditions ：10% of Ni ion, 20 mL of model oil,70℃ of reaction temperature,80 minutes of reaction time, 1： 70 mass ratio of catalyst to simulate oil, and 0. 03 volumetric ratio of hydrogen peroxide and oil