Effect of microstructure on gas/solid interactions in porous materials

微观结构对多孔材料气/固相互作用的影响

• 批准号: 355521-2012
• 负责人: DarvishiAlamdari, Houshang
• 金额: $ 1.75万
• 依托单位: Université Laval
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=572597
• 关键词: Effect; microstructure; gas; solid; interactions

This research programme aims at better understanding of the interactions between gas and porous materials and the effects of such an interaction could have on different materials applications. Sensitivity of gas sensors, performance of catalysts, and combustion rate of carbon materials are particularly targeted as potential application fields taking advantage of generated knowledge by this research. The programme is set out to study the effect of pore structure on gas/solid interactions in sensors and carbon-based materials and to provide a theoretical basis for rate equations involved. In order to attribute a rate equation at different depth of a porous material the exact concentration of gas as a function of material depth should be known. Consequently, the effective diffusion coefficient of gas species within the pores is required. A number of structural parameters influence the effective diffusivity of a porous materials such as pore size distribution, tortuosity, ... It is therefore the aim of this programme to establish constitutive laws revealing the effect of structural parameters on diffusion parameters namely in the porous materials where the diffusing gas reacts with the porous media. Upon the completion of this research programme, it is expected that a reliable theoretical basis be provided helping the modeling of sensing or catalytic properties of porous layers and of air/CO2 reactivity of carbon-based materials. It is also expected that the achievements be used as a guide line for engineering the pore structure by choosing appropriate starting materials and process parameters leading to the development of optimal microstructures.

该研究计划旨在更好地了解气体和多孔材料之间的相互作用以及这种相互作用可能对不同材料应用产生的影响。利用本研究产生的知识，气体传感器的灵敏度、催化剂的性能和碳材料的燃烧速率特别成为潜在的应用领域。 该项目旨在研究传感器和碳基材料中孔隙结构对气/固相互作用的影响，并为所涉及的速率方程提供理论基础。为了归因于多孔材料的不同深度处的速率方程，应该知道作为材料深度的函数的准确气体浓度。因此，需要孔隙内气体物质的有效扩散系数。许多结构参数影响多孔材料的有效扩散率，例如孔径分布、曲折度……因此，该程序的目的是建立本构定律，揭示结构参数对多孔材料中扩散参数的影响扩散气体与多孔介质发生反应。 该研究计划完成后，预计将提供可靠的理论基础，帮助对多孔层的传感或催化性能以及碳基材料的空气/二氧化碳反应性进行建模。还期望这些成果能够作为通过选择适当的起始材料和工艺参数来设计孔隙结构的指南，从而形成最佳的微观结构。