锌钨酸季铵盐的制备及其催化氧化脱硫性能研究

摘要

合成了具有 Sandwich 型结构的锌钨酸季铵盐 Q12[WZn3（H2 O）2（ZnW9 O34）2]（其中 Q＝[C18 H37（CH3）3 N]＋，[C16 H33（CH3）3 N]＋，[C12 H25（CH3）3 N]＋），并通过 X 射线衍射、傅里叶变换红外光谱、热重分析、元素分析等手段对表面活性剂自组装锌钨酸盐复合催化剂进行了表征。以二苯并噻吩为模型化合物和双氧水为氧化剂，考察了复合催化剂在模拟油品氧化脱硫反应中的性能。结果表明，随着表面活性剂烷基链长的增长，二苯并噻吩的脱除率逐渐提高，在60℃条件下反应2 h，最高可达94．4％。%Sandwich-type polytangstozincic quaternary ammonium salts Q12 [WZn3 (H2 O )2 (ZnW9 O34 )2 ](Q=[C18 H37 (CH3 )3 N]+ ,[C16 H33 (CH3 )3 N]+ ,and[C12 H25 (CH3 )3 N]+ )were successful-ly synthesized,and the composite catalyst of mixed surfactant and the salts were characterized by X-ray diffraction,Fourier transform infrared spectroscopy,thermal gravity analysis,and elemental analysis. Using mixture of dibenzothiphene,a model compound and hydrogen peroxide,an oxidant as test feed,the as-synthesized composite materials were applied to the catalytic oxidative desulfurization of the mixture to evaluate their activity. The results show that the desulfurization rate of dibenzothiphene is enhanced with increasing alkyl chain length of the surfactant. At 60 ℃ for 2 h,the S removal rate reaches up to 94.4%.