铁掺杂介孔磷铝分子筛催化苯酚羟基化反应性能

CATALYTIC PERFORMANCE OF Fe-SUBSTITUTED MESOPOROUS ALUMINOPHOSPHATE MOLECULAR SIEVES FOR PHENOL HYDROXYLATION

以水热晶化法合成了Fe掺杂介孔磷铝分子筛,并采用XRD、N2吸附-脱附、UV-Vis等手段对其进行了表征,还研究了其在苯酚羟基化反应中的催化性能及工艺条件对苯酚羟基化反应的影响。结果表明,合成的Fe掺杂介孔磷铝分子筛具有介孔结构,有较高的比表面积。焙烧后的Fe掺杂磷铝分子筛中,Fe3+主要以四配位的形式存在于分子筛骨架中。以水为反应介质,在反应温度80℃、反应时间6 h、苯酚/H2O2摩尔比为3的条件下,苯酚的转化率达到21.0%、邻苯二酚和对苯二酚的选择性分别达到66.8%和31.4%。

Fe-substituted aluminophosphate molecular sieve（Fe-MAP） was prepared by hydrothermal crystallization and characterized with XRD,N2 adsorption and UV-Vis.The catalytic performance of Fe-MAP for phenol hydroxylation was investigated,in which the effects of solvents,reaction temperature,catalyst concentration and time on the reaction of phenol hydroxylation were discussed.The results showed that the synthesized Fe-MAP sample was the typical mesoporous molecular sieve and had large specific surface area.The Fe^3＋ was successfully incorporated into the framework of Fe-MAP and mainly presented in tetrahedral coordination after calcination.Under the conditions of water solvent,reaction temperature 80℃,reaction time 6 h,and n（Phenol）/n（H2O2）=3,the conversion of phenol,the selectivity to catechol and the selectivity to hydroquinone reached 21.0%,66.8% and 31.4%,respectively.