晶化温度对ZSM-5-KIT-6复合材料结构及加氢脱硫性能的影响

Effect of Crystallization Temperature on Structure and Hydrodesulfurization Catalytic Performance of ZSM-5-KIT-6 Composites

为了实现超低硫柴油产品的生产,以三嵌段共聚物P123和正丁醇为混合模板剂,采用水热晶化法制备了介微孔复合材料ZSM-5-KIT-6(ZK),并将其负载活性组分NiMo,制备出加氢脱硫催化剂,并用X射线衍射,透射电镜,傅立叶变换红外光谱及N_2吸附-脱附等表征方法对制备的催化剂进行了柴油加氢脱硫活性评价。研究了晶化温度从100℃升高到180℃对复合材料结构及其催化剂活性的影响。结果表明,在研究的温度范围内(100℃~180℃),随着晶化温度的升高,ZK复合材料的孔径变大,比表面积及孔容降低,结构的有序性变差;在柴油的加氢脱硫反应中,随着晶化温度的升高,催化剂的活性逐渐降低,当晶化温度为100℃时,催化剂活性最佳,脱硫率达到96.4%。

To deeply hydrodesulfurizate diesel fuel,the present study synthesizes the micro-mesoporouscomposite material ZSM-5-KIT-6（ZK）as the hydrodesulfurization（HDS）catalyst support by hydrothermalcrystallization method using triblock copolymers P123 and n-butanol as mixed templates. Ni and Mo weresupported on ZK as the active components. The effects of the crystallization temperature on catalyst structurewere characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infraredspectroscopy and N2 adsorption-desorption methods. Moreover,the HDS catalytic performances of the preparedcatalysts were evaluated. The results showed that the pore sizes of ZK composites increased with increasingcrystallization temperatures from 100 ℃ to 180 ℃,while the specific surface area and pore volume decreased,the ordering of structure also became worse. The catalytic activity gradually decreased when crystallizationtemperature increased. At 100 ℃,the desulfurization rate reached up to 96.4%,showing the best catalytic activity.