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首页> 外文期刊>Nanotechnology >The biosynthesis of palladium nanoparticles by antioxidants in Gardenia jasminoides Ellis: long lifetime nanocatalysts for p-nitrotoluene hydrogenation
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The biosynthesis of palladium nanoparticles by antioxidants in Gardenia jasminoides Ellis: long lifetime nanocatalysts for p-nitrotoluene hydrogenation

机译：Garden子茉莉中的抗氧化剂生物合成钯纳米粒子：对硝基甲苯加氢的长寿命纳米催化剂

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摘要

Gardenia jasminoides Ellis’ water crude extract was used for the bioreduction of palladium chloride in this paper. The UV–vis spectrum, x-ray diffraction spectrum measurement, the Fourier transform infrared spectroscopy and TEM technique confirmed the formation of palladium nanoparticles and identified antioxidants including geniposide, chlorogenic acid, crocins and crocetin were reducing and stabilizing agents for synthesizing palladium nanoparticles in water crude extract. The particle size and dispersity were temperature-dependent. The particle sizes ranged from 3 to 5 nm and revealed the best dispersity at 70 ℃. Catalytic performance of the biosynthetic Pd nanoparticles with good dispersity was investigated by hydrogenation of p-nitrotoluene. The catalysts showed a conversion of 100% under conditions of 5 MPa, 150 ℃ for 2 h. The selectivity of p-methyl-cyclohexylamine achieved 26.3%. The catalyst was recycled five times with no agglomeration and maintained activity, which was attributed to the appropriate protection of the antioxidants. On the basis of the study, it appears to be a new promising biosynthetic nanocatalyst for the development of an industrial process.
机译：本文使用子茉莉Ellis的水质粗提物对氯化钯进行生物还原。紫外可见光谱，X射线衍射光谱测量，傅立叶变换红外光谱和TEM技术证实了钯纳米颗粒的形成，并确定了子苷，绿原酸，crocins和crocetin等抗氧化剂是还原和稳定剂，用于在水中合成钯纳米颗粒粗提物。粒度和分散度与温度有关。粒径范围为3至5 nm，在70℃时显示出最佳分散性。通过对硝基甲苯的氢化研究了具有良好分散性的生物合成Pd纳米颗粒的催化性能。催化剂在5 MPa，150℃，2 h的条件下转化率为100％。对甲基-环己胺的选择性达到26.3％。催化剂在没有结块和保持活性的情况下循环了五次，这归因于对抗氧化剂的适当保护。根据该研究，它似乎是用于工业过程发展的一种新的有前途的生物合成纳米催化剂。

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