Bepari Ruhul Amin, Bharali Palash, Das Birinchi Kumar
Department of Chemistry, Gauhati University Guwahati-781014 Assam India
Department of Chemistry, B. N. College Dhubri-783324 Assam India.
RSC Adv. 2022 Feb 18;12(10):6044-6053. doi: 10.1039/d1ra09384c. eCollection 2022 Feb 16.
Nanoscale CuO with diameters in the range of 7-8 nm has been synthesized a two-step precipitation-calcination method using copper(ii) isonicotinate tetrahydrate as the precursor. The first step involves the room temperature stirring of an alkaline ethanolic solution of the precursor which gives a non-crystalline CuO species, while the second step involves the calcination of the product of the first step at 180 °C to form nanocrystalline CuO which has been characterized by PXRD, TEM, SEM, H-TPR and Raman spectroscopy, The CuO material has shown excellent catalytic activity in the oxidation of styrene using TBHP as the oxidizing agent leading to complete styrene conversion with more than 95% styrene oxide selectivity at the end of 6 h. The oxide catalyst can be reused for at least 6 successive runs without significant loss in activity.
采用两步沉淀-煅烧法，以四水合异烟酸铜（II）为前驱体，合成了直径在7-8纳米范围内的纳米氧化铜。第一步是在室温下搅拌前驱体的碱性乙醇溶液，得到非晶态的氧化铜物种，而第二步是将第一步的产物在180℃下煅烧，形成纳米晶氧化铜，通过粉末X射线衍射（PXRD）、透射电子显微镜（TEM）、扫描电子显微镜（SEM）、程序升温还原（H-TPR）和拉曼光谱对其进行了表征。该氧化铜材料在以叔丁基过氧化氢（TBHP）为氧化剂氧化苯乙烯的反应中表现出优异的催化活性，在6小时结束时苯乙烯完全转化，环氧苯乙烷选择性超过95%。该氧化物催化剂可以至少连续重复使用6次而活性没有明显损失。
