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首页> 外文会议>World Conference on Carbon >CARBON MATERIALS AS CATALYST SUPPORTS AND CO-CATALYSTS FOR BIOMASS UPGRADING PROCESSES
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CARBON MATERIALS AS CATALYST SUPPORTS AND CO-CATALYSTS FOR BIOMASS UPGRADING PROCESSES

机译：碳材料作为生物量升级过程的催化剂载体和助催化剂

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Most of the strategies for the upgrading of biomass-derived platform molecules involve multifunctional catalysts.Furthermore,many of these reactions take place in biphasic systems,with a marked influence of the mass transference between phases.The use of carbon materials can be very useful for tuning catalyst properties or to promote interphase mass-transfer effects.We consider the upgrading route cellulose to biogenic aldehydes(furfural and 5-HMF)with further transformation of these aldehydes into long chain hydrocarbons and chemicals via aldol condensation and hydrogenation.The first step is performed at mild conditions using homogeneous acid as catalysts,and the process is limited by the low water solubility of the aldehydes.We demonstrate that the use of carbonaceous materials as co-catalysts enhances the mass transfer of the aldehydes from aqueous to organic phase,improving reaction rates and limiting further non-desired decompositions.Concerning to the aldol condensation,we demonstrate that supporting the Mg-Zr mixed oxide(typical catalyst for this reaction)on non-microporous carbonaceous materials,such as carbon nanofibers(CNFs)or high surface area graphites(HSAGs)leads to a better performance,justified by a more appropriate basic sites distribution and the corresponding interactions between reactants and the support.This interaction also improves the behaviour of the catalysts used for the hydrogenation(HDO)of these adducts.The use of carbon materials,especially HSAGs,has important advantages in comparison to common inorganic supports(hindering the formation of carbonaceous deposits).By contrast,active carbons(AC)lead to poorer results,mainly caused by mass transfer limitations.
机译：大多数升级生物质衍生平台分子的策略涉及多官能催化剂。许多这些反应在双相系统中进行，具有阶段之间的质量转移的显着影响。碳材料的使用非常有用调节催化剂性质或促进相间的传质效果。我们考虑通过醛醇缩合和氢化将这些醛的进一步转化为生物醛纤维素与生物醛（糠醛和5-HMF）的升级纤维素与这些醛转化为长链烃和化学物质。第一步是使用均相酸作为催化剂在温和条件下进行，并且该方法受醛的低水溶性的限制。我们表明碳质材料作为助催化剂的使用增强了醛从含水到有机相中的传质，改善了醛反应速率和限制进一步的不需要的分解。对醛醇的凝结，我们欺骗在非微孔碳质材料（如碳纳米纤维（CNF）或高表面积石墨（HSAG）等中，施用支撑Mg-Zr混合氧化物（用于该反应的典型催化剂），导致更好的性能，通过更合适的基础证明位点分布与反应物和support.This相互作用也提高了用于这些adducts.The使用碳材料，特别是HSAGs的的氢化（HDO）催化剂的行为之间的对应的相互作用，具有相比于普通的无机载体的重要优点（妨碍碳质沉积物的形成）.by对比，活性炭（AC）导致较差的结果，主要是由传质限制引起的。

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