Kirar Jagat Singh, Gupta Neeraj Mohan, Chandra Kailash, Vani Hitesh Kumar, Khare Savita, Tiwari Neha, Deswal Yogesh
Department of Chemistry, Government P.G. College, Guna, Madhya Pradesh473001, India.
Department of Chemistry, Bareilly College, Bareilly, Uttar Pradesh243005, India.
ACS Omega. 2022 Nov 1;7(45):41058-41068. doi: 10.1021/acsomega.2c04425. eCollection 2022 Nov 15.
In the chemical industry, designing high-performance catalysts for the oxidation of cyclohexane into value-added products such as cyclohexanol and cyclohexanone (the combination is known as KA oil) is critical. The catalytic activity of copper nanoparticles supported on layered double hydroxide (LDH) for the liquid phase oxidation of cyclohexane was examined in this study. In this work, we have developed Cu nanoparticles supported on layered double hydroxide nanocatalysts, abbreviated as CuNPs@LDH, by the chemical reduction approach. Various physical methods were used to characterize the resulting material, including ICP-AES, XRD, FTIR, SEM, EDX, HRTEM, and BET surface area. The catalytic activity of copper nanoparticles supported on LDH was examined for the liquid phase oxidation of cyclohexane with -butyl hydroperoxide. CuNPs@LDH nanocatalysts with an excellent 52.3% conversion of cyclohexane with 97.2% selectivity of KA oil was obtained after 6 h at 353 K. The hot filtration test further indicated that CuNPs@LDH was a heterogeneous catalyst that could be recycled at least six times without suffering a substantial reduction in its catalytic activity.
在化学工业中，设计高性能催化剂将环己烷氧化为环己醇和环己酮等增值产品（二者合称KA油）至关重要。本研究考察了负载在层状双氢氧化物（LDH）上的铜纳米颗粒对环己烷液相氧化的催化活性。在这项工作中，我们通过化学还原法制备了负载在层状双氢氧化物纳米催化剂上的铜纳米颗粒，简称为CuNPs@LDH。采用了多种物理方法对所得材料进行表征，包括电感耦合等离子体发射光谱法（ICP - AES）、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、能谱分析（EDX）、高分辨率透射电子显微镜（HRTEM）和比表面积（BET）测定。考察了负载在LDH上的铜纳米颗粒对环己烷与叔丁基过氧化氢液相氧化反应的催化活性。在353 K下反应6小时后，获得了具有优异性能的CuNPs@LDH纳米催化剂，环己烷转化率达52.3%，KA油选择性为97.2%。热过滤试验进一步表明，CuNPs@LDH是一种多相催化剂，可至少循环使用六次，且催化活性不会大幅降低。
