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Benign approach for methyl-esterification of oxygenated organic compounds using TBHP as methylating and oxidizing agent
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2017-12-21 , DOI: 10.1016/j.apcatb.2017.12.056
Topi Ghosh , Prakash Chandra , Akbar Mohammad , Shaikh M. Mobin

Methyl-esterification of oxygenates such as alcohols, aldehydes and carboxylic acids were carried out by employing copper and copper/palladium based catalysts using TBHP. In this reaction, TBHP plays dual role as oxidizing and methylating agent. Cu and Cu-Pd based nanoperticles (NPs) were prepared by wet chemical method using CuCl or PdCl2 by engaging “green solvent” water and dextrose as eco-friendly and renewable reagents. The NPs were fully characterized using various physicochemical techniques such as XRD, SEM, TEM and EDAX. XRD spectra of synthesized NPs confirmed the formation of CuO and Pd/Cu2Cl(OH)3. HRTEM analysis of CuO confirmed uniform cube-shaped morphology with particle size of 25–30 nm. Whereas, HRTEM of Pd/Cu2Cl(OH)3 showed 5–10 nm Pd NPs uniformly dispersed over Cu2Cl(OH)3 surface. Excellent catalytic activity was obtained for the conversion of benzaldehyde to methyl benzoate with 92% selectivity using Pd/Cu2Cl(OH)3 nanocatalyst. Other oxygenates such as aldehydes, alcohols and carboxylic acids were also obtained with high conversion and selectivity for desired methyl esters.



中文翻译:

TBHP作为甲基化和氧化剂的氧化有机化合物甲基化的良性方法

含氧化合物(如醇,醛和羧酸)的甲基酯化反应是通过使用铜和铜/钯基催化剂使用TBHP进行的。在该反应中,TBHP扮演着氧化剂和甲基化剂的双重角色。通过使用“绿色溶剂”水和葡萄糖作为环保和可再生试剂,使用CuCl或PdCl 2通过湿化学方法制备了基于Cu和Cu-Pd的纳米微粒(NPs)。使用各种物理化学技术(例如XRD,SEM,TEM和EDAX)对NP进行了全面表征。合成的NP的X射线衍射图谱证实了CuO和Pd / Cu 2 Cl(OH)3的形成。对CuO的HRTEM分析证实了粒径为25–30 nm的均匀立方体形状。而Pd / Cu 2 Cl(OH)的HRTEM图3显示5-10 nm的Pd NPs均匀分散在Cu 2 Cl(OH)3表面上。使用Pd / Cu 2 Cl(OH)3纳米催化剂将苯甲醛转化为苯甲酸甲酯具有92%的选择性,获得了优异的催化活性。还以期望的甲酯的高转化率和选择性获得了其他的含氧化合物,例如醛,醇和羧酸。

更新日期:2017-12-21
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