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制备了多种载体(MCM-41、ZSM-5、γ-Al2O3、TiO2)负载的Ni-VPO催化剂,对催化剂进行XRD、FT-IR、SEM表征,考察了它们在苯乙烯催化氧化选择性合成苯甲醛反应中的活性.结果表明,Ni-VPO/TiO2对苯乙烯催化氧化反应具有最好的转化率和选择性,在优化条件下,苯乙烯转化率为91.2%,苯甲醛选择性76%.认为TiO2载体提高了(VO)2P2O7在载体表面的分散程度,抑制(VO)2P2O7的聚合,以及可能发生的TiO2与VPO某种程度的键联,是催化活性提高的主要原因.
Ni-VPO catalysts supported on various supports (MCM-41, ZSM-5, γ-Al2O3, TiO2) were prepared and their catalysts were characterized by XRD, FT-IR and SEM. Benzaldehyde.The results show that Ni-VPO / TiO2 has the best conversion and selectivity for styrene oxidation reaction under the optimal conditions, the conversion of styrene is 91.2%, the selectivity of benzaldehyde is 76% It is believed that the TiO2 carrier enhances the dispersion of (VO) 2P2O7 on the surface of the carrier, inhibits the polymerization of (VO) 2P2O7 and some possible bonding between TiO2 and VPO, which is the main reason for the increase of catalytic activity.