提高非贵金属临氢脱腊催化剂异构化能力的研究

通过水热条件下合成分子筛试验条件的考察,获得了合成条件和性能良好的ZSM-8分子筛。采用无定形硅铝和ZSM-8分子筛制备出复合载体型的非贵金属临氢脱腊催化剂,通过锌和钨改性组分的添加,提高现有工业催化剂的异构化能力。实验结果表明,不同复合载体、改性组分对催化性能有较大影响,但改性组分的添加次序无明显作用。与以前β沸石基催化剂性能相比,ZSM-8基催化剂不仅提高了润滑油收率,而且产品润滑油的粘度指数也明显提高。催化性能的改进可以归结为改性后催化剂异构化能力的提高。

STUDY ON THE IMPROVEMENT OF THE ISOMERIZATION ABILITY OF A NON-PRECIOUS METAL HYDRODEWAXING CATALYST

The optimum parameters as well as the ZSM-8 molecular sieve product with good properties were obtained through detailed synthesis investigation under hydrothermal conditions. Composite support, which was formed from an Amorphous Si-Al gel and ZSM-8 zeolite, was impregnated with active components to produce the non-precious metal catalyst for hydrodewaxing. The aim to increase the catalytic isomerization ability was thus realized by additional introduction of zinc and tungsten beside the main molybdenum and nickel. It has been shown that the catalytic properties are significantly influenced by both the catalyst support and the addition of the promoters. However, the addition sequence of zinc shows little effect. Compared to the β-zeolite based catalyst, the new ZSM-8 based catalyst showed a better catalytic behavior, which was characterized by an increased yield and a higher viscosity index of lube base oil product. The improvement of catalyst performance could be ascribed to the increased isomerization ability of new catalyst system.