Gold supported on titania for specific monohydrogenation of dinitroaromatics in the liquid phase

Gold supported on titania for specific monohydrogenation of dinitroaromatics in the liquid phase
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二氧化钛负载金用于二硝基芳烃在液相中的特异性单加氢

DOI:
10.1039/c4gc00869c
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发表时间:
2014-08
期刊:
影响因子:
9.8
通讯作者:
Cao Yong
Cao Yong
中科院分区:
化学1区
文献类型:
--
作者:
Yu Lei;Liu Yong-Mei;He He-Yong;Cao Yong

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研究了金基催化剂上不同取代二硝基芳烃液相选择性单加氢合成相应的硝基苯胺。特别注意的是Au颗粒大小对这种单还原反应的影响。有趣的是,含有相对较大的平均Au颗粒尺寸(>5 nm)的TiO 2负载的金催化剂对于二硝基芳族化合物的特定单氢化显示出远为上级的化学选择性,其中对于负载约10 nm的Au颗粒的催化剂可获得最高性能。7.5 nm.在分子间竞争氢化的结果表明,与具有较大的Au颗粒的催化剂所需的硝基苯胺的固有的较高的积累速率负责观察到的高化学选择性。
Liquid-phase selective monohydrogenation of various substituted dinitroaromatics to the corresponding valuable nitroanilines was investigated on gold-based catalysts. Special attention was paid to the effect of Au particle size on this monoreduction reaction. Interestingly, TiO2 supported gold catalysts containing a relatively larger mean Au particle size (>5 nm) showed far superior chemoselectivity for specific mono-hydrogenation of dinitroaromatics, with the highest performance attainable for the catalyst bearing Au particles of ca. 7.5 nm. Results in the intermolecular competitive hydrogenation showed that the intrinsic higher accumulation rates of the desired nitroanilines associated with the catalyst possessing larger Au particles were responsible for the high chemoselectivity observed.
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