WO_3/HMS催化氧化β-甲基萘合成β-甲基萘醌研究

Synthesis of β-methylnaphthoquinone by Catalytic Oxidation of β-methylnaphthalene with WO_3/HMS Catalyst

在冰醋酸中(HAc),以(NH4)2WO4为钨源制备的WO3/HMS分子筛为催化剂,过氧化氢(H2O2)为氧化剂,考察了β-甲基萘(β-MN)合成β-甲基萘醌(β-MNQ)的多相催化反应中反应温度、反应时间、WO3的负载量、催化剂用量以及氧化剂用量等因素对反应的影响。试验结果表明,WO3/HMS催化剂催化β-MN氧化合成β-MNQ的适宜工艺条件为:反应温度为353 K、反应时间为6 h、n(H2O2)/n(β-MN)为18和n(Si)/n(W)为30的催化剂用量为0.3 g/mL(以HAc为基准),在此条件下,β-MNQ的选择性和收率分别为51.7%和46.9%。

β-methylnaphthoquinone（β-MNQ） was synthesized by heterogeneous catalytic oxidation of β-methylnaphthalene（β-MN） with WO3 /HMS as catalyst and hydrogen peroxide as oxidant in acetic acid（HAc）.The catalyst of molecular sieve WO3 /HMS was prepared with（NH4）2WO4 as tungsten source.The effect of process conditions such as reaction temperature,reaction time,loading content of WO3,catalyst usage and mass fraction of oxidant on the reaction were investigated.The experimental results showed that the optimum conditions of β-MNQ synthesized with β-MN over WO3 /HMS catalyst were as follows： the reaction temperature was 353 K,the reaction time was 6 h,n（H2O2） /n（β-MN） = 18：1,the amount of catalyst with n（Si） /n（W） = 30 was 0.3 g /mL（based on HAc）.Under these conditions,the selectivity and the yield of β-MNQ were up to 51.7% and 46.9%,respectively.