The biosynthesis of palladium nanoparticles by antioxidants in Gardenia jasminoides Ellis: long lifetime nanocatalysts for p-nitrotoluene hydrogenation
The biosynthesis of palladium nanoparticles by antioxidants in Gardenia jasminoides Ellis: long lifetime nanocatalysts for p-nitrotoluene hydrogenation
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栀子中抗氧化剂生物合成钯纳米颗粒：用于对硝基甲苯加氢的长寿命纳米催化剂
DOI：
10.1088/0957-4484/20/38/385601
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发表时间：
2009-09-23
期刊：
影响因子：
3.5
通讯作者：
Song, Hao
中科院分区：
文献类型：
--
作者：
Jia, Lishan;Zhang, Qian;Song, Hao
采用栀子水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、傅里叶变换红外光谱和透射电镜技术证实了钯纳米颗粒的形成，并确定了京尼平苷、绿原酸、藏红花素和藏红花素等抗氧化剂是水粗提物中钯纳米颗粒合成的还原剂和稳定剂。颗粒大小和分散性与温度有关。粒径范围为3 ~ 5 nm，在70℃时分散性最佳，对硝基甲苯加氢考察了分散性好的生物合成钯纳米颗粒的催化性能。在5 MPa、150℃、2 h条件下，催化剂的转化率为100%，对甲基环己胺的选择性达到26.3%。催化剂可循环使用5次，无结块，并保持活性，这归功于抗氧化剂的适当保护。在研究的基础上，它似乎是一种新的有前景的生物合成纳米催化剂的工业过程的发展。
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 degrees C. 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 degrees C 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.