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首页> 外文期刊>RSC Advances >Hollow mesoporous silica supported PtIr bimetal catalysts for selective hydrogenation of phenol: significant promotion effect of iridium
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Hollow mesoporous silica supported PtIr bimetal catalysts for selective hydrogenation of phenol: significant promotion effect of iridium

机译：空心介孔二氧化硅负载的PtIr双金属催化剂用于苯酚的选择性加氢：铱的显着促进作用

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Selective hydrogenation of phenol is of great significant for the production of Nylon 6. Herein, highly efficient and stable Ir promoted Pt catalysts for the hydrogenation of phenol are prepared by deposition of Pt–Ir nanoparticles onto hollow mesoporous silica spheres (HMSs) through a facile wet-impregnation and H2 reduction method. The obtained PtIr/HMS catalyst with Ir/Pt molar ratio of 0.1 shows a highest hydrogenation rate of 4255 mmol h?1 gPt?1 with cyclohexanone selectivity of 85% at 50 °C and 0.5 MPa of pH2, which is 3 times and 8.6 times higher than that of the mono Pt/HMS catalyst and commercial Pt catalyst, respectively. The trace addition of Ir promoter essentially contributes to the enhanced hydrogenation activity by improving the metal dispersion of Pt nanoparticles and promoting the charge transfer between the Pt and Ir. This work provides an effective protocol in developing high performance catalysts for phenol hydrogenation under mild reaction conditions.
机译：苯酚的选择性加氢对于尼龙6的生产具有重要意义。在此，通过将Pt-Ir纳米颗粒通过中空沉积在空心介孔二氧化硅球（HMS）上，制备出高效且稳定的Ir促进的Pt催化苯酚加氢催化剂。湿法浸渍和H 2 还原方法。得到的Ir / Pt摩尔比为0.1的PtIr / HMS催化剂的最高氢化速率为4255 mmol h ？1 g Pt ？1 ，在50°C时环己酮选择性为85％， p H为0.5 MPa 2 ，分别比单Pt / HMS催化剂和市售Pt催化剂高3倍和8.6倍。微量添加Ir助催化剂通过改善Pt纳米颗粒的金属分散性和促进Pt与Ir之间的电荷转移，实质上有助于增强氢化活性。这项工作为开发在温和的反应条件下进行苯酚加氢的高性能催化剂提供了有效的方案。

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