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首页> 外文期刊>Catalysis science & technology >Comparative study of bioethanol transformation catalyzed by Ru or Pt nanoparticles supported on KL zeolite
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Comparative study of bioethanol transformation catalyzed by Ru or Pt nanoparticles supported on KL zeolite

机译：比较研究的生物乙醇转换催化俄文或Pt纳米粒子支持

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The catalytic properties of two noble metals, Pt and Ru, supported on KL zeolite were investigated in the selective transformation of bioethanol. In aiming to have an increased basicity of the catalyst, a KL zeolite modified by the addition of Ba was also used as support for Pt catalyst. For comparative purposes, Ru supported on hydrophobic high surface area graphite (HSAG) was also prepared. The catalytic tests were conducted in a fixed bed flow reactor, by feeding either pure ethanol vapor or a mixture of 10% water/90% ethanol in an inert gas, and working at low conversions to assure kinetic conditions. All the catalysts have relatively stable catalytic performance at up to 6 hours on stream with both reactant feedings. In general, the catalytic activities of Pt-based catalysts, given as turn-over-frequencies, were one order of magnitude higher than those obtained over Ru catalysts. It was also demonstrated that the nature of the supported metal nanoparticles (Ru vs. Pt) significantly affects the product selectivities. So when comparing Pt/KL and Ru/KL, methane and carbon monoxide by-products are mainly produced on the former, indicating that degradation of the primary product acetaldehyde by decarbonylation is higher on Pt catalysts. In the case of ruthenium nanoparticles, acetaldehyde is the predominant product. Finally, the comparison of Ru supported on KL zeolite and on HSAG revealed that, in the second case, ethylene is the principal by-product and that in some extension, this ethylene can be hydrogenated to ethane, probably spending hydrogen generated in the acetaldehyde formation. DRIFTS experiments were also conducted to identify the adsorbed intermediate species present under the reaction conditions on the different catalysts. All the selectivity differences have been rationalized using appropriate reaction pathways, and it is inferred that the variation of the chosen metal-support system is decisive to obtain a given reaction product.
机译：两种贵金属的催化性质,Pt和俄罗斯,支持在KL沸石在生物乙醇的选择性转换。希望有一个碱度的增加KL添加沸石改性的催化剂英航也用作支持Pt催化剂。出于比较目的,俄罗斯支持疏水性高表面积石墨(HSAG)也准备好了。在固定床流动反应器,通过喂养纯乙醇蒸汽或水10% / 90%的混合物乙醇的惰性气体,在较低的工作转换,确保动力条件。催化剂有相对稳定的催化性能高达6小时流两种反应物喂奶。活动Pt-based催化剂,给出turn-over-frequencies秩序之一级高于获得超过俄罗斯催化剂。支持的金属纳米粒子(俄文的性质与Pt)显著影响产品选择性。甲烷和一氧化碳的副产品主要产生在前,表示乙醛降解的主要产品通过脱羰作用较高Pt催化剂。钌纳米颗粒的情况下,乙醛是主要的产品。比较俄罗斯支持KL沸石HSAG透露,在第二种情况下,乙烯是主要的副产品,在一些吗扩展,这可以氢化乙烯乙烷,可能支出氢生成乙醛的形成。也进行了辨认吸附中间物种存在下反应条件在不同的催化剂。选择性差异已经被合理化使用适当的反应途径,推断出的变化金属支架系统是决定性的获得反应产物。

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