Preparation of ordered macroporous HPW/TiO2 catalyst by colloidal crystal template method and its desulfurization performance
In order to effectively address the issue of loading and recovery of phosphotungstic acid(HPW)in fuel oxidation desulfurization technology,a series of loaded ordered macroporous HPW/TiO2 catalysts were prepared by using PS colloidal crystal as template and by the method of sol-gel and dry glue stripping at 450 ℃,HPW/TiO2-20(HPW load of 20wt.％)with excellent performance was screened out.The structure and performance of catalysts were characterized by SEM,XRD,FT-IR and nitrogen adsorption-desorption.The results show that the catalyst has a macropore size of approximately 250 nm,a specific surface area of approximately 92.3 m2/g,and a well-organized and ordered arrangement of macropopres.The catalyst also exhibits mesopores formed by sintering nanoparticles,and the pore size distribution is about 20 to 45 nm.The catalytic oxidation experiment shows that when the reaction temperature of HPW/TiO2-20 is 50 ℃,the O/S ratio is 4,and the dosage is 0.5 g,the catalytic oxidation desulfurization rate of Dibenzothiophene(DBT)in simulated fuel is 100％in 2 h,and it only decreases by 2.1％after being reused for 9 times.Under the same conditions,the catalytic oxidation desulfurization rates of BT and 4,6-DMDBT in fuel oil reaches 94％and 92.5％respectively.The loading of HPW in HPW/TiO2-20 not only preserves the ordered structure of catalyst macropores,but also maintains the good catalytic oxidation activity of HPW,and the number of repetitions after catalyst recovery is also obviously improved.
万方数据
