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 Mossbauer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-Fe2
The 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 didnt 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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
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
