Ce_(1-x)Sm_xO_(1.9-δ) nanoparticles obtained by microwave-assisted hydrothermal processing: an efficient application for catalytic oxidation of a-bisabolol

A. G.M. Sitva; T. S. Rodrigues; A. Dias

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Ce_(1-x)Sm_xO_(1.9-δ) nanoparticles obtained by microwave-assisted hydrothermal processing: an efficient application for catalytic oxidation of a-bisabolol

机译：CE_（1-X）SM_XO_（1.9-δ）通过微波辅助水热加工获得的纳米颗粒：有效应用A-Bisabolol的催化氧化

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Heterogeneous catalysts based on Sm-doped ceria were employed for the first time in the liquid-phase oxidation of a-bisabolol. Nanometer-sized catalysts were obtained by microwave-hydrothermal synthesis and were characterized by X-ray diffraction (XRD), temperature programmed reduction (TPR), Raman spectroscopy and N2-physisorption. The influence of Sm doping, temperature and the solvent used on the catalytic behavior was investigated. Conversions up to 84% and a combined selectivity for the products up to 77% were obtained for Ce_(0.9)Sm_(0.15)O_(1.85-δ) catalysts. The reactions were highly selective for the epoxidation products (only bisabolol oxides A and B were obtained) and shown to be strongly dependent on the temperature and solvent employed. Best results were achieved for higher Sm concentrations, which indicate that changes in the textural properties due to doping produced a significantly more active catalyst.

机译：基于Sm掺杂陶瓷的异质催化剂首次用于A-Bisabolol的液相氧化。通过微波 - 氢热合成获得纳米尺寸的催化剂，并通过X射线衍射（XRD），温度编程还原（TPR），拉曼光谱和N2-磷酸分析来表征。研究了SM掺杂，温度和使用的溶剂对催化行为的影响。对于CE_（0.9）SM_（0.15）O_（1.85-δ）催化剂，获得了高达84％的转化率，并且对产品的合并选择性最高为77％。对环氧化产物的反应高度选择性（仅获得了Bisabolol氧化物A和B），并显示出强烈依赖于使用的温度和溶剂。对于较高的SM浓度，取得了最佳的结果，这表明由于掺杂而导致的纹理特性的变化产生了明显的活性催化剂。

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来源
《Catalysis science & technology》 |2014年第3期|814-821|共8页
作者
A. G.M. Sitva; T. S. Rodrigues; A. Dias;
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作者单位

Departamento de Quimica, Universidade Federal de Ouro Preto, Mono do Cruzeiro, 35400-00, Ouro Preto, MG, Brazil;

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原文格式 PDF
正文语种英语
中图分类汉语教学;
关键词
bisabolol; CATALYTIC OXIDATION; SolventsCatalystsintensified by microwaveTemperatureREACTIONDoping in SportshydrothermalHYDROTHERMAL SYNTHESISSamarium;

机译：bisabolol;催化氧化;通过在Sportshydrothydrothydrothydrothydrothydrothermalhydrothermal synthesissamarium中通过微无膜尿素作用而溶剂催化剂;

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Ce_(1-x)Sm_xO_(1.9-δ) nanoparticles obtained by microwave-assisted hydrothermal processing: an efficient application for catalytic oxidation of a-bisabolol

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