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负载银的氧化锰八面体分子筛（Ag-OMS-2）纳米棒作为水溶液中腈水合制酰胺的高效多相催化剂。

Ag-embedded manganese oxide octahedral molecular sieve (Ag-OMS-2) nano-rods as efficient heterogeneous catalysts for hydration of nitriles to amides in aqueous solution.

作者信息

Kalimani Farimah Mazloom, Khorshidi Alireza

机构信息

Department of Chemistry, Faculty of Sciences, University of Guilan 41335-1914 Rasht Iran

出版信息

RSC Adv. 2023 Mar 1;13(10):6909-6918. doi: 10.1039/d3ra00292f. eCollection 2023 Feb 21.

DOI:10.1039/d3ra00292f
PMID:36874936
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9977403/
Abstract

Silver-embedded manganese oxide octahedral molecular sieve (Ag-OMS-2) nano-rods were synthesized using a pre-incorporation approach, and unambiguously characterized by transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and thermogravimetric analysis (TGA). A highly uniform distribution of Ag nanoparticles embedded in the porous structure of OMS-2, was found to be in favor of high catalytic activity of the composite for hydration of nitriles to corresponding amides in aqueous solution. By using a catalyst dosage of 30 mg per mmol of substrate, in the temperature range of 80-100 °C, and reaction times of 4-9 h, excellent yields (73-96%) of the desired amides (13 examples) were obtained. Also, the catalyst was easy to recycle, and showed a slight decrease in efficiency after six consecutive runs.

摘要

采用预掺入法合成了银嵌入的氧化锰八面体分子筛（Ag-OMS-2）纳米棒，并通过透射电子显微镜（TEM）、场发射扫描电子显微镜（FESEM）、能量色散X射线光谱（EDS）、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）和热重分析（TGA）对其进行了明确表征。发现嵌入OMS-2多孔结构中的银纳米颗粒高度均匀分布，有利于该复合材料在水溶液中将腈水合为相应酰胺的高催化活性。在每毫摩尔底物使用30毫克催化剂用量、80-100°C的温度范围内以及4-9小时的反应时间下，获得了所需酰胺（13个实例）的优异产率（73-96%）。此外，该催化剂易于循环使用，并且在连续六次运行后效率略有下降。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/40b0/9977403/90ff5cc6b371/d3ra00292f-f9.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/40b0/9977403/90ff5cc6b371/d3ra00292f-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/40b0/9977403/cf32cf80c578/d3ra00292f-f1.jpg
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