Palladium islands on iron oxide nanoparticles for hydrodesulfurization catalysis

Mansouri Ali; Semagina Natalia

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Palladium islands on iron oxide nanoparticles for hydrodesulfurization catalysis

机译：钯岛屿对氧化铁纳米粒子渣油加氢催化

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A four-fold increase in palladium (Pd) mass-based hydrodesulfurization (HDS) activity was achieved by depositing Pd species as nanosized islands on 12 nm colloidal iron oxide (FeOx) nanoparticles via the galvanic exchange reaction. The highest palladium dispersion was obtained at an optimal Pd/Fe molar ratio of 0.2, which decreased when the ratio increased. The improved dispersion was responsible for the enhanced catalytic activity per the total Pd amount in the HDS of 4,6-dimethyldibenzothiophene at 623 K and 3 MPa as compared to the iron-free Pd/Al2O3 catalyst. The lattice strain and modified electronic properties of the Pd islands suppressed deep hydrogenation to dimethylbicyclohexyl and changed the hydrocracking product distribution. Pd nanoparticles deposited on commercial Fe2O3 did not provide such an activity enhancement and catalyzed significant cracking. This study demonstrates that FeOx@Pd structures are a possible alternative to monometallic Pd catalysts with enhanced noble metal atom efficiency for ultra-deep HDS catalysis and points to their great potential to reduce the catalyst cost and move towards more earth-abundant catalytic materials.

机译：钯(Pd)大众化增加到了原来的4倍加氢脱硫(HDS)活动通过Pd物种在纳米尺度的岛屿12纳米胶体氧化铁纳米粒子(FeOx)通过电交换反应。在一个最优的钯分散了钯/铁摩尔比率为0.2,下降时比例增加。负责提高催化活性每HDS的Pd总额4,在623 K和3 MPa 6-dimethyldibenzothiophene而免烫Pd /氧化铝催化剂。晶格应变和修改电子Pd岛屿的属性压制深加氢dimethylbicyclohexyl和改变加氢裂化产品分布。纳米颗粒沉积在商业Fe2O3没有提供这样一个活动增强催化重要的开裂。是一个表明FeOx@Pd结构可能的替代单本位制的钯催化剂与贵金属原子效率提高对于超HDS催化和指向他们巨大的潜力,以降低成本和催化剂走向更多的地球上充足的催化材料。

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来源
《Catalysis science & technology》 |2018年第9期|2323-2332|共10页
作者
Mansouri Ali; Semagina Natalia;
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作者单位

Univ Alberta, Dept Chem & Mat Engn, 9211-116 St, Edmonton, AB T6G 1H9, Canada;

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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
Catalysis; Nanoparticles; Electronic propertiesHydrodesulfurizationExchange reactionsuperparamagnetic iron oxide nanoparticlemonocrystalline iron oxide nanoparticleislandslattice strainCatalyst activity;

机译：催化、纳米粒子、电子propertiesHydrodesulfurizationExchangereactionsuperparamagnetic氧化铁nanoparticlemonocrystalline氧化铁nanoparticleislandslattice strainCatalyst活动;

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Palladium islands on iron oxide nanoparticles for hydrodesulfurization catalysis

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