改性VPO催化剂选择性催化氧化苯乙烯合成苯甲醛  

The Selective Oxidation of Styrene to Benzaldehyde by Modified VPO Catalyst

作　　者：孔祥国[1] 胡波[1] 卓广澜[1] 

机构地区：[1]浙江理工大学理学院,浙江杭州310018

出　　处：《分子催化》2013年第1期23-29,共7页Journal of Molecular Catalysis(China)

摘　　要：以30%H2O2为氧化剂,金属助剂改性VPO为催化剂选择性氧化苯乙烯合成苯甲醛.研究了金属助剂、反应时间、温度、溶剂、氧化剂的量等对反应的影响.结果表明,镍助剂修饰的VPO能显著提高苯甲醛选择性,在Ni-VPO催化剂用量为5%,n(苯乙烯)∶n(H2O2)=1∶2,乙腈做溶剂50℃反应6 h的最优条件下,苯乙烯转化率为80.6%,苯甲醛选择性74%.XRD、FT-IR、SEM对催化剂进行表征并提出了可能的反应机理.Selective oxidation of styrene was carried out using styrene as the raw material, 30% hydrogen peroxide as the oxidant, and modified vanadium phosphate oxide as the catalyst. The results showed that nickel modified VPO significantly increased the selectivity of benzaldehyde. To investigate the nickel effect, the catalysts were characterized using X-ray diffraction, Fourier transform infrared spectroscopy, Field emission scanning electron mi- croscope. Under the optimal conditions（ acetonitrile as solvent, the amount of Ni-VPO catalyst is 5%, n（styrene） ： n（hydrogen peroxide）= 1 ： 2, 6 h, 50 ℃ ）, the convertion of styrene is 80.6%, and the selectivity of benzalde- hyde is 74%. The reaction mechanism was also investigated.

关 键 词：钒磷氧催化剂 选择性氧化 苯乙烯 苯甲醛 

分 类 号：O643.3[理学—物理化学]