Ni/SiO_(2)催化C_(9)石油树脂加氢的研究

Study on Ni/SiO_(2) catalyst for hydrogenation of C_(9) petroleum resin

以六水硝酸镍和钠水玻璃为镍源和硅源、碳酸钠为沉淀剂、聚乙烯吡咯烷酮为分散剂,采用共沉淀法合成了C_(9)石油树脂加氢催化剂;对催化剂制备的搅拌方式、共沉淀温度、老化时间和剪切速率进行了研究,考察了反应条件对C_(9)石油树脂加氢的影响。结果表明,与普通搅拌相比,在高速剪切下所制备的催化剂活性组分分散性更好,在共沉淀温度为70℃、老化时间为0 h、剪切速率为900 r/min下所制备的催化剂在高负载的同时比表面积达到472 m^(2)/g,具有微-介-大孔的多级孔道结构,形貌为纳米片组成的蜂窝状不规则球体。在反应温度为270℃、H_(2)压力为6 MPa、反应时间为2 h及C_(9)石油树脂与溶剂质量比为1∶2时,C_(9)石油树脂的氢化率达到96.59%,循环套用7次后氢化率仍然在95%以上。

The catalysts for C_(9) petroleum resin hydrogenation are synthesized via the co-precipitation method with nickel nitrate hexahydrate as nickel source,sodium silicate as silicon source,sodium carbonate as precipitant and polyvinylpyrrolidone as dispersant.The stir pattern,co-precipitation temperature,aging time and shear rate in the preparation of catalyst are investigated,as well as the effect of reaction conditions on the hydrogenation of C_(9) petroleum resin are evaluated.It is found that the active components of the catalysts prepared under high speed shear have better dispersibility than those prepared under ordinary agitation.The catalyst prepared at a precipitation temperature of 70℃,an aging time of 0 h and a shear rate of 900 r·min^(-1)shows a high load,a specific surface area of 472 m^(2)·g^(-1),a microporous-mesoporous-macroporous multi-stage channel structure,and a honeycombed irregular sphere morphology that is composed of nanosheets.The hydrogenation rate of C_(9) petroleum resin reaches 96.59%when the reaction temperature is 270℃,the pressure of H_(2) is 6 MPa,the reaction lasts for 2 h and the mass ratio of C_(9) petroleum resin to solvent is 1∶2.The hydrogenation rate remains still above 95%after the catalyst has been used for 7 cycles.