表面修饰的钒氧化物纳米带上甲苯选择氧化反应

采用声化学水热法制备了V₂O₅纳米带,并将十六烷基膦酸负载在它和块状V₂O₅表面上,以修饰催化剂表面,通过调变催化剂中晶格氧活动性以及表面酸碱性来控制其催化甲苯氧化产物的选择性.结果表明,V₂O₅纳米带具有较强的晶格氧活动性,与普通块状V₂O₅相比,甲苯转化率更高,但苯甲醛和苯甲酸的总选择性下降.经过表面修饰后,V₂O₅纳米带的催化活性以及苯甲醛、苯甲酸总选择性增加;而块状V₂O₅上苯甲醛、苯甲酸总选择性更高,但催化活性显著下降.

Selective oxidation of toluene using surface-modified vanadium oxide nanobelts

Vanadium oxide nanobelts were synthesized using a sonochemical-hydrothermal method. Hexadecylphosphonic acid (HDPA) was introduced onto the surfaces of the nanobelts and bulk vanadium oxide to tune their catalytic properties; these properties were tested using gas-phase oxidation of toluene. The catalytic activity of the vanadium oxide nanobelts was higher than that of the bulk oxide as a result of the higher lattice oxygen activity of the nanobelts. Doping with HDPA, tuning the lattice oxygen activity, and blocking unselective sites led to both higher activity and selectivities for benzaldehyde and benzoic acid on nanobelt-like vanadium oxides, whereas led to lower activity but higher selectivities for benzaldehyde and benzoic acid on bulk vanadium oxides.