Preparation and Catalytic Application of Phenylsulfonic Acid Functionalized Porous Phosphate Heterostructure Materials

A series of phenylsulfonic acid functionalized porous phosphate heterostructure (PPH) materials were prepared by co-condensation method and characterized by SEM, FHR, Si MAS NMR, TG and N₂ adorption. Their catalytic behavior for alkylation of hydroquinone with tert—butanol was compared. The catalytic activity was greatly enhanced after the introduction of phenylsulfonic acid group. ZrP-0.4-2-10%-PhSO₃ H is a more active catalyst for the reaction in comparison to others. The conversion of hydroquinone and the yield of 2-tert-butylhydroquinone on the catalyst reach 85.4% and 58.5% at 150°C, respectively. The activity correlates well with the amount of the accessible acid sites on its surface. The catalyst is stable and reusable, and the product yield is only reduced by 10% after three runs. The reduction in activity is probably caused by leaching of phenylsulfonic group or deposition of coke on the active sites.

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