Covalent attachment of Mn-porphyrin onto functionalized activated carbon for green oxidation of olefins

IF 2.2 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY Journal of the Iranian Chemical Society Pub Date : 2024-10-21 DOI:10.1007/s13738-024-03114-7

Saeed Rayati, Makan Etefagh

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Abstract

Complexes of first row transition metals are a promising class of inexpensive catalysts for oxidation reactions. In this work, we studied the influence of covalent immobilization of Mn-porphyrin onto the surface of activated carbon in the green oxidation of various olefins. meso-tetrakis(4-carboxyphenyl)porphyrinatomanganese(III) acetate (MnTCPP) immobilized onto hydroxylated activated carbon (AC-OH). The anchored catalyst was characterized using FTIR, UV–VIS, atomic absorption and EDX spectroscopies. TGA analysis and BET-BJH method were employed to determine thermal behavior and surface properties of complex respectively. Then, catalytic performance of MnTCPP@AC-OH was investigated in the green oxidation of olefins with molecular oxygen and hydrogen peroxide. A comparison between two green oxidants (molecular oxygen and hydrogen peroxide) shows that although more product is obtained with hydrogen peroxide, more recyclability is obtained with molecular oxygen. The separation and recovery of the nanocatalyst was simple, effective and economical in this green oxidation method and the supported catalyst can be reused at least five times without significant loss of activity.

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将锰卟啉共价附着到功能化活性炭上，实现烯烃的绿色氧化

第一排过渡金属的络合物是一类很有前途的廉价氧化反应催化剂。在这项工作中，我们研究了将锰卟啉共价固定到活性炭表面对各种烯烃绿色氧化的影响，并将中-四（4-羧基苯基）卟啉-锰（III）醋酸盐（MnTCPP）固定到羟基活性炭（AC-OH）上。使用傅立叶变换红外光谱（FTIR）、紫外可见光谱（UV-VIS）、原子吸收光谱（Atomic absorption）和乙二胺四乙酸氙（EDX）光谱对固定催化剂进行了表征。TGA分析和BET-BJH法分别测定了复合物的热行为和表面性质。然后，研究了 MnTCPP@AC-OH 在烯烃与分子氧和过氧化氢的绿色氧化过程中的催化性能。两种绿色氧化剂（分子氧和过氧化氢）之间的比较表明，虽然过氧化氢能得到更多的产物，但分子氧能得到更多的可回收性。在这种绿色氧化方法中，纳米催化剂的分离和回收简单、有效、经济，而且支撑催化剂可重复使用至少五次而不会明显丧失活性。

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来源期刊

Journal of the Iranian Chemical Society 化学-化学综合

CiteScore

4.40

自引率

8.30%

发文量

230

审稿时长

5.6 months

期刊介绍： JICS is an international journal covering general fields of chemistry. JICS welcomes high quality original papers in English dealing with experimental, theoretical and applied research related to all branches of chemistry. These include the fields of analytical, inorganic, organic and physical chemistry as well as the chemical biology area. Review articles discussing specific areas of chemistry of current chemical or biological importance are also published. JICS ensures visibility of your research results to a worldwide audience in science. You are kindly invited to submit your manuscript to the Editor-in-Chief or Regional Editor. All contributions in the form of original papers or short communications will be peer reviewed and published free of charge after acceptance.