Assessment of the metal exchanged phosphomolybdic acid salt-catalyzed nerol oxidation reactions with hydrogen peroxide
作者:Alana Alves Rodrigues、Márcio J. da Silva、Sukarno Olavo Ferreira、Rene Chagas da Silva、Tiago Almeida Silva、Eduardo Nery Duarte de Araújo
DOI:10.1016/j.mcat.2023.113221
日期:2023.7
In this work, phosphomolybdate salts were synthesized by exchanging the protons of the phosphomolybdic acid with metal cations (i.e., Co2+, Cu2+, Zn2+, Mn2+, Ni2+, Al3+, and Fe3+ cations) and evaluated as catalysts in oxidation reactions of terpene alcohols with hydrogen peroxide. All the catalysts were characterized by Raman, UV-Vis, and infrared spectroscopies, powder X-rays diffraction, energy dispersive
在这项工作中,通过将磷钼酸的质子与金属阳离子(即 Co 2+、Cu 2+、Zn 2+、Mn 2+、Ni 2+、Al 3+和 Fe 3+ )交换来合成磷钼酸盐阳离子)并被评估为萜烯醇与过氧化氢氧化反应中的催化剂。所有催化剂都通过拉曼、紫外-可见和红外光谱、粉末 X 射线衍射、能量色散光谱、扫描电子显微镜和热分析进行了表征。酸位点的强度通过电位滴定曲线确定。在橙花醇氧化测试的催化剂中(即选择的模型分子),AlPMo 12O 40是对主要产品橙花醇环氧化物最具活性和选择性的催化剂。评估了主要反应变量,例如 H 2 O 2 :底物摩尔比、时间、温度、类型和催化剂负载。重点是将催化剂的物理化学性质与其性能相关联。反应范围扩展到其他萜烯醇。烯丙醇(橙花醇和香叶醇)主要转化为环氧化物,而仲(冰片)醇和叔(芳樟醇)醇的氧化分别得到羰基产物(樟脑)或环化产物(呋喃和吡喃环)。