Improvement Prepare for the Beta Zeolite and its Catalytic Activity on Hydroisomerization of n-Hexane

Molybdenum carbide catalysts were prepared by temperature-programmed reaction using β-zeolite as carrier which was treated by alkaline solution，using (NH₄)₆Mo₇O₂₄·4H₂O as molybdenum source and n-hexane as carbon source. The characterization results of XRD, BET,FT-IR,TEM showed that the modified β-zeolite possessed high specific surface area and large pore volume. The catalytic performance for hydroisomerization over β-Mo₂C/modified β-zeolite has been investigated in a fixed-bed down-flow reactor, using n-hexane as the module reactant. The result of the reaction shows that the modified β-zeolite catalyst has higher hydroisomerization conversion rate, selectivity and yield than the β-zeolite powder. Moreover, the life of the β-Mo₂C/modified β-zeolite catalyst increased nearly doubled, and the most suitable reaction temperature of the β-Mo₂C/modified β-zeolite catalyst reduced 10℃.