活性炭负载P-Mo-W杂多酸催化苯酚氧化溴化反应

Oxybromination of Phenol Over Phosphorus Molybdenum Tungsten Heteropoly Acid Catalyst Supported on Activated Carbon

以活性炭为载体,采用浸渍法制备了负载磷钼钨杂多酸催化剂,利用XRD和IR对催化剂进行了表征,并以溴化钾为溴源,双氧水为氧化剂,评价了催化剂的苯酚氧化溴化反应催化活性。结果表明,活性炭负载后,催化剂仍保持了磷钼钨杂多酸的Keggin结构;催化剂具有较强的苯酚氧化溴化催化活性和对位溴代反应选择性;反应后负载杂多酸有所损失,但催化剂整体物相没有发生明显变化。

Activated carbon supported phosphorus molybdenum tungsten heteropoly acid as oxybromination reaction catalyst was prepared via immersion method. Catalyst properties were investigated by X--ray diffraction （XRD） and IR methods. And the oxybromination reaction activity of catalyst was studied with potassium bromide as bromine source and hydrogen peroxide as oxidizer. The results indicate that the Keggin structure is still retaining after supported, and the catalyst exhibits high oxybromination reaction activity and high selectivity of para product. Supported heteropoly acid slightly lost after reaction, but the whole physical phase of catalyst has no significant changes.