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Feasible and Clean Solid-Phase Synthesis of LiNbO3 by Microwave-Induced Combustion and Its Application as Catalyst for Low-Temperature Aniline Oxidation
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-01-17 00:00:00 , DOI: 10.1021/acssuschemeng.7b02921 Neftali L. V. Carreno 1 , Vinícius G. Deon 1 , Ricardo M. Silva 1 , Luiza R. Santana 1 , Rodrigo M. Pereira 2 , Marcelo O. Orlandi 3 , Wellington M. Ventura 4 , Anderson Dias 4 , Jason G. Taylor 4 , Humberto V. Fajardo 4 , Marcia F. Mesko 2
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-01-17 00:00:00 , DOI: 10.1021/acssuschemeng.7b02921 Neftali L. V. Carreno 1 , Vinícius G. Deon 1 , Ricardo M. Silva 1 , Luiza R. Santana 1 , Rodrigo M. Pereira 2 , Marcelo O. Orlandi 3 , Wellington M. Ventura 4 , Anderson Dias 4 , Jason G. Taylor 4 , Humberto V. Fajardo 4 , Marcia F. Mesko 2
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In this work, a feasible, fast, clean and efficient microwave-induced combustion method for direct synthesis of LiNbO3 in solid phase was developed. X-ray powder diffraction studies showed that quasi-pure Li–Nb–O phases, such as LiNbO3 and Li3NbO4, or mixtures of LiNbO3, Li3NbO4 and LiNb3O8, could be successfully synthesized. The resulting powders were efficiently applied as catalysts under ambient conditions in the oxidation process of aniline using hydrogen peroxide as oxidant. The proposed method was performed in a commercial system using high-pressure quartz vessels, which allowed safe control of the reactions–that usually occurs in less than 1 min. The results showed that the reaction conditions as well as the structural and morphological characteristics of the catalyst influenced the aniline oxidation process. Therefore, the present method for the preparation of LiNbO3 described herein, displayed many advantages when compared to conventional combustion methods, such as the physical characteristics of the obtained compound. Moreover, this new approach is considerably faster, safer and cleaner than other traditional procedures described in literature for LiNbO3 synthesis. This new microwave-induced combustion method is less time-consuming, saves energy, as well as affording the stoichiometric formation of inorganic particles.
中文翻译：
微波诱导燃烧合成LiNbO 3的可行方法及其在低温固相合成中的应用
在这项工作中，开发了一种可行，快速，清洁和有效的微波诱导燃烧方法，以直接合成固相中的LiNbO 3。X射线粉末衍射研究表明，准纯Li–Nb–O相，例如LiNbO 3和Li 3 NbO 4，或LiNbO 3，Li 3 NbO 4和LiNb 3 O 8的混合物，可以成功合成。使用过氧化氢作为氧化剂，将所得粉末在环境条件下有效地应用于苯胺的氧化过程中作为催化剂。所建议的方法是在使用高压石英容器的商业系统中执行的，该容器可安全控制反应，通常只需不到1分钟即可完成。结果表明，反应条件以及催化剂的结构和形态特征影响了苯胺的氧化过程。因此，本发明制备LiNbO 3的方法与常规燃烧方法相比，本文所述的方法显示出许多优点，例如获得的化合物的物理特性。而且，这种新方法比文献中描述的用于LiNbO 3合成的其他传统方法要快得多，更安全，更清洁。这种新的微波诱导燃烧方法耗时少，节省了能量，并提供了化学计量形成的无机颗粒。
更新日期：2018-01-17
中文翻译：
微波诱导燃烧合成LiNbO 3的可行方法及其在低温固相合成中的应用
在这项工作中，开发了一种可行，快速，清洁和有效的微波诱导燃烧方法，以直接合成固相中的LiNbO 3。X射线粉末衍射研究表明，准纯Li–Nb–O相，例如LiNbO 3和Li 3 NbO 4，或LiNbO 3，Li 3 NbO 4和LiNb 3 O 8的混合物，可以成功合成。使用过氧化氢作为氧化剂，将所得粉末在环境条件下有效地应用于苯胺的氧化过程中作为催化剂。所建议的方法是在使用高压石英容器的商业系统中执行的，该容器可安全控制反应，通常只需不到1分钟即可完成。结果表明，反应条件以及催化剂的结构和形态特征影响了苯胺的氧化过程。因此，本发明制备LiNbO 3的方法与常规燃烧方法相比，本文所述的方法显示出许多优点，例如获得的化合物的物理特性。而且，这种新方法比文献中描述的用于LiNbO 3合成的其他传统方法要快得多，更安全，更清洁。这种新的微波诱导燃烧方法耗时少，节省了能量，并提供了化学计量形成的无机颗粒。
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