Au Nanoparticles Confined in SBA-15 as a Highly Efficient and Stable Catalyst for Hydrogenation of Quinoline to 1,2,3,4-
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Au Nanoparticles Confined in SBA‑15 as a Highly Efficient and Stable Catalyst for Hydrogenation of Quinoline to 1,2,3,4‑Tetrahydroquinoline Jianbo Zhao1 · Haifeng Yuan1 · Xiaomei Qin · Kuan Tian1 · Yingfan Liu1 · Chengzhen Wei2 · Zhiqiang Zhang1 · Liming Zhou3 · Shaoming Fang3 Received: 14 February 2020 / Accepted: 16 March 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Au nanoparticles confined within the mesopores of the modified SBA-15 were obtained through adsorption-reduction method and firstly employed as chemoselective catalyst for quinoline hydrogenation. The effects of Au loadings, calcination temperature as well as structure of support on catalytic performances of Au catalysts were explored. The as-obtained 1.2%Au@ SBA-15-500 catalyst exhibited high activity, excellent selectivity towards 1,2,3,4-tetrahydroquinoline and extraordinary sintering-resistant property as high as 800 °C, which is sharp contrast to the 1.3%Au/SiO2-500 catalyst. It also showed good recyclability and versatility for quinoline derivatives. The observed properties were assigned to small-sized Au nanoparticles and mesopores of SBA-15. Our work provides a facile and promising approach to construct metal nanocatalysts with high catalytic performance by the use of mesoporous materials. Graphic Abstract
Keywords Au nanocatalyst · SBA-15 · Quinoline · Selective hydrogenation
* Jianbo Zhao [email protected] * Liming Zhou [email protected] * Shaoming Fang [email protected] 1
2
Henan Province Key Laboratory of New Opto‑Electronic Functional Materials, Anyang Normal University, Anyang, Henan 455000, People’s Republic of China
3
Henan Provincial Key Laboratory of Surface and Interface Science, Zhengzhou University of Light Industry, No. 136 of Science Road, Zhengzhou 450001, People’s Republic of China
School of Material and Chemical Engineering, Zhengzhou University of Light Industry, No. 136 of Science Road, Zhengzhou 450001, People’s Republic of China
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1 Introduction N-heterocyclic compounds including 1,2,3,4-tetraquinoline have taken much interest because of their wide application in fine chemical fields such as dyes, agrochemicals and biological active molecules [1, 2]. Among the synthetic strategies to acquire 1,2,3,4-tetraquinoline, the quinoline hydrogenation is the most simple and powerful approach [3]. This kind of reaction was reported to proceed over homogeneous metal catalysts, such as Rh, Ru and Ir [4–7]. Unfortunately, these catalytic systems usually possessed some disadvantages such as the high cost of ligands and catalysts, rigorous reaction conditions, especially the difficulties in recovering the rare and expensive noble metal catalysts from the reaction mixtures [3]. From the standpoint of sustainable development, it is desirable that the reaction is carried out over heterogeneous catalysts under mild reaction conditions. In recent years, heterogeneous metal nanocatalysts including Ru, Pd, Pt and Co have been developed for selective hy
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