摘要
苯酚羟基化联产邻苯二酚和对苯二酚是一条典型的绿色工艺路线.通过对多种金属酸铁酸盐进行筛选,得出以Fe(NO3)3.9H2O为铁源、Cu(CH3COO)2.H2O为铜源,以氨水为沉淀剂,采用共沉淀法制备的Fe-Cu复合金属酸盐催化剂具有最好的催化活性.结果表明,在水作溶剂,催化剂与苯酚的质量比为1∶100,苯酚初始浓度25%,反应温度65℃,苯酚与双氧水的摩尔比为2的条件下,采用Fe-Cu催化剂,苯酚单程转化率可达25%,苯二酚总选择性在90%左右.通过对铁酸盐催化剂的XRD、IR表征,可以看出,Fe-Cu催化剂具有独特的CuFe2O4尖晶石结构,因而具有不同于其它铁酸盐的衍射峰和吸收峰.另外,Fe-Cu催化剂制备简便、原料廉价易得,因此具有良好的工业应用前景.
Phenol hydroxylation with aqueous hydrogen peroxide was known as the most effective manufacture in the world. In this paper, a novel catalyst was synthesized via coprecipitation method from an aqueous solution containing Fe（ NO3） 3 9H20 and Cu（ CH3COO）2H2O with ammonia. It was shown that phenol conversion was 25% and dihydroxybenzene total selectivity reaches 90% with Fe-Cu as catalyst, water as solvent, 1% catalyst/phenol, 25% phenol initial concentration, reaction temperature 65℃, phenol/H2O2 molar ratio =2. The X-ray diffraction peaks of the catalyst showed that the as-prepared sample has engendered CuFe2O4 crystal with spinel structure, which was also confirmed by its IR spectrum. Furthermore, Fe-Cu catalyst was an effective and promising catalyst with its convenient preparation and inexpensive metallic sources.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2005年第6期448-452,共5页
Journal of Molecular Catalysis(China)
