负载型VPO催化剂选择性催化苯乙烯合成苯甲醛

Selective Oxidation of Styrene to Benzaldehyde over Supported VPO Catalyst

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.

Supported nickel modified vanadium phosphate oxide （Ni-VPO） catalysts were prepared using different supports such as MCM-41, ZSM-5, T-A1203 and TiO2 and characterized by XRD, FT-IR and SEM spectroscopy. The catalytic activity of oxidation of styrene to benzaldehyde was investigated. The results revealed that TiO2 sup- ported Ni-VPO catalyst was the most effective catalyst in comparison to other supported Ni-VPOs. Under the opti- mal conditions, the conversion of styrene is 91.2% with 76.0% benzaldehyde selectivity. It is believed that TiO2 helps to disperse the active phase （VO）2P207 on the surface and prevents it to aggregate. Meanwhile, some reac- tion may occur between TiO2 and VPO.