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首页> 外文期刊>Catalysis science & technology >Fabrication of Ag/Mn3O4 nano-architectures for the one-step selective oxidation of 3-picoline to niacin: a key to vitamin B-3 production
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Fabrication of Ag/Mn3O4 nano-architectures for the one-step selective oxidation of 3-picoline to niacin: a key to vitamin B-3 production

机译：制造Ag / Mn3O4 nano-architectures的一步3-picoline的选择性氧化烟酸:维生素酮生产的关键

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摘要

We have synthesized Ag nanoparticles (with sizes of 2-5 nm) supported on 1D Mn3O4 spinel nanorods by a surfactant-assisted single-step preparation method using a room-temperature synthesis protocol for the first time. The unique 1D rod-like morphology increases the amount of adsorption sites of the support, leading to less sintering and higher dispersion of Ag nanoparticles, resulting in significantly enhanced catalytic activity for the industrially important selective oxidation of 3-picoline to niacin. The catalyst was thoroughly characterized by XRD, XPS, SEM, TEM, Raman, FTIR and UV-visible spectroscopy. XRD revealed the formation of Ag nanoparticles supported on hausmannite-type tetragonal Mn3O4. Electron microscopy studies confirmed the formation of the 1D structure of the catalyst. The generation of this 1D nanostructure has been revealed in detail and correlated with its superior catalytic activity. Various reaction parameters like temperature, substrate : H2O2 molar ratio, reaction time, etc. were studied. A niacin selectivity of 97%, with a 3-picoline conversion of 55%, was achieved over this catalyst at 70 degrees C. It was noticed that, when halide ions (Br-) were present in the synthesis gel mixture, only then were the morphology and activity of the catalyst proven to be superior. The thorough dispersion of Ag nanoparticles on Mn3O4 nanorods and the synergy displayed between Ag nanoparticles and Mn3O4 are the detrimental factors for its high activity. The catalyst was reused 5 times and thereby displayed its true heterogeneous character.
机译：我们合成Ag纳米颗粒(大小2 - 5 nm)支持1 d Mn3O4尖晶石纳米棒由surfactant-assisted单步准备使用室温合成方法协议的第一次。棒状形态增加的数量吸附网站的支持,导致更少烧结和高色散Ag)纳米颗粒,导致显著加强对工业催化活性重要的3-picoline选择性氧化烟酸。通过XRD、XPS、SEM, TEM,拉曼光谱、红外光谱和紫外可见光谱学。纳米粒子支持hausmannite-type正方Mn3O4。确认的一维结构的形成催化剂。纳米结构已经被详细披露与它的优越的催化活性。各种反应参数,如温度、衬底:过氧化氢的摩尔比、反应时间等。进行了研究。3-picoline转化率为55%,实现了注意到这个催化剂在70度c,当卤化物离子(Br)中合成凝胶混合物,只有这样的催化剂的形态和活动证明是优越的。纳米粒子在Mn3O4纳米棒和协同作用显示Ag纳米颗粒和Mn3O4之间其高的不利因素的活动。催化剂重复使用5次,从而显示其真正的异构的特点。

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