ABSTRACT

The abundant and inexpensive transition metal iron was loaded onto the abundant nonmetal minerals of coal-bearing kaolin (CK) to synthesize cost-effective iron nanoparticle (FeNP)-loaded kaolin heterogeneous catalysts. Various characterization techniques were performed, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The catalytic activity was screened for the direct esterification of benzoic acid with cyclic ether via activation of the C(sp³)-H bond in a cross-dehydrogenative-coupling reaction, and the corresponding α-acyloxy ether products were obtained in good yield. Notably, the FeNP-loaded CK solid catalysts were relatively stable and could be reused at least five times while retaining good catalytic activity.

摘要

将丰富且廉价的过渡金属铁负载到丰富的含煤高岭土 (CK) 非金属矿物上，以合成具有成本效益的铁纳米颗粒 (FeNP) 负载高岭土多相催化剂。进行了各种表征技术，例如 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM) 和 X 射线光电子能谱 (XPS)。筛选了苯甲酸与环醚通过活化 C(sp ³)-H键在交叉脱氢偶联反应中，并以良好的收率获得相应的α-酰氧基醚产物。值得注意的是，负载 FeNP 的 CK 固体催化剂相对稳定，可以重复使用至少 5 次，同时保持良好的催化活性。