微孔树脂镶嵌超细α-Fe_2O_3催化剂的制备、表征及其在苯酚H_2O_2羟化制备苯二酚反应中的应用  

Preparation and Characterization of Nanoscales α-Fe_2O_3/Microporous resin Catalyst and the Application in Hydroxylation of Phenol with H 2O 2 to Dihydroxybenzene

作　　者：刘庆生[1] 于剑锋[1] 叶秋实 傅颖寰[1] 许宁[1] 吴通好[1] 

机构地区：[1]吉林大学化学系催化研究室,长春130023 [2]吉林化工集团公司研究院,吉林132021

出　　处：《高等学校化学学报》2002年第2期259-262,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :2 97730 16 )资助

摘　　要：用离子交换方法制备了 α-Fe2 O3/微孔树脂催化剂 .XRD,TEM和 Mossbauer谱测试结果表明 ,制得的α-Fe2 O3粒子尺寸非常细小 ,其粒径至少在 5 nm以下 .该催化剂在苯酚 H2 O2 羟化制备苯二酚反应中表现出了良好的催化活性 ,在 n(苯酚 ) / n( H2 O2 ) =3条件下 ,苯酚的有效转化率可达到 2 2 .4 % ,产物中邻苯二酚和对苯二酚的物质的量比接近 1 .4∶ 1 ,反应放大 30 0 0倍后羟化活性及产物的选择性基本不变 .与化学沉淀法制得的纳米 α-Fe2 O3羟化活性比较认为 ,造成二者催化活性不同的主要原因是 α-Fe2The nanoscales α Fe 2O 3 /microporous resin catalyst was prepared by the ion exchange method and characterized by means of X ray diffraction(XRD), transmission electron microscopy(TEM) and Mssbauer spectroscopy. The uses of these techniques make it possible to perform an estimation of the size of the iron oxide crystallites on microporous resin. The size of the crystallites has been found to be smaller than 5 nm. The catalyst prepared exhibited a very good catalytic activity on the hydroxylation of phenol with H 2O 2 to dihydroxybenzene. The effect conversion of phenol reached 22.4% when phenol/H 2O 2(molar ratio) is 3 and the ratio of catechol and hydroquinone is about 1.4 in the products. The results didnt change when the reaction was magnified to 3 000 times. Furthermore, compared α Fe 2O 3 /microporous resin with α Fe 2O 3 prepared from chemical precipitation, it was thought that the reason of different hydroxylation activity of phenol between the two kinds of catalysts was the size of particles in nature.

关 键 词：Α-FE2O3 微孔树脂 苯酚 过氧化氢 羟化 苯二酚 催化剂 表征 α-三氧化二铁 催化活性 

分 类 号：O625.312[理学—有机化学] O643.36[理学—化学]