Characterising Transport Routes in Dual-phase Molten-salt Membranes for Carbon Dioxide Separation

表征二氧化碳分离双相熔盐膜中的传输路径

• 批准号: 2875396
• 金额: --
• 依托单位: Newcastle University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2875396
• 关键词: Characterising; Transport; Routes; Dual; phase

Supported molten-salt membranes (MSMs) are a type of dual-phase gas separation membrane, consisting of a solid inorganic support (typically a ceramic e.g., alumina) which has been impregnated with a molten salt such as an alkali metal carbonate. The molten salt (MS) is retained within the pore space of the support via capillary forces. Over the past few decades work has demonstrated these membranes' notably high selectivities and permeabilities, which are orders of magnitude beyond those of common polymeric membranes, attributed to the facilitated-transport mechanism in MSMs for gas transfer. In this process, the gas undergoes chemical reactions with ions at the feed side of the membrane, forming new ionic species e.g., carbonate ions, that diffuse through the membrane to the permeate side. There, the gas is released from the membrane, and the ions are regenerated through the reverse of the feed side reaction. The development of this class of membrane leads into many potential advantages in terms of a smaller footprint compared to current CCS technologies and as such, these membranes present an appealing option for the separation of carbon dioxide from mixed gas streams.Detailed investigations into modifying support functionality reveal impacts on transport mechanisms and CO2 flux. While extensive research has addressed the influence of support modification, limited exploration exists on the MS's specific interactions with the support material and their effects on CO2 permeation. The nature of the inorganic support dictates the mechanism of CO2 transport. Various types of membrane support, such as inert ones like alumina, electron-conducting supports like silver, and oxide ion conducting materials such as perovskite, all result in different transport mechanisms. While transportation methods tend to be mutually exclusive, efforts have been directed toward combining multiple approaches, leading to higher recorded fluxes. This has promoted the development of mixed ionic electronic conducting supports, facilitating both oxide ion and electron conduction.This research will probe the transport mechanism through a range of spectroscopic, permeation, and diffraction techniques to investigate the solid support, MS, and the interface between the two. Key inquiries will focus on elucidating the speciation of the MS, understanding the role of ion transport in either or both phases, and identifying novel interfacial species. The project aims to reveal further insights into the mechanisms governing CO2 separation in dual-phase molten-salt membranes.

受支持的熔融盐膜（MSMS）是一种双相气体分离膜，由固体无机支撑（通常是陶瓷）组成（例如，氧化铝），含有熔融盐（如碱金属碳酸盐）。熔融盐（MS）通过毛细管保留在支撑的孔隙中。在过去的几十年中，工作表明了这些膜的较高的选择性和渗透率，这是超出常见聚合膜膜的数量级，这归因于MSMS中促进的传播机制的气体传输机制。在此过程中，气体在膜的进料侧与离子经历化学反应，形成了新的离子物种，例如碳酸盐离子，从膜通过膜扩散到渗透的侧。那里的气体从膜上释放，离子通过进料侧反应的反向再生。与当前的CCS技术相比，这类膜的开发在较小的占用方面具有许多潜在的优势，因此，这些膜为将二氧化碳与混合气流分离而成的选择是一种吸引人的选择。用于修改辅助功能对运输机制和CO2 Flux的影响。尽管广泛的研究已经解决了支持修改的影响，但对MS与支持材料的特定相互作用及其对CO2渗透的影响有限。无机支撑的性质决定了二氧化碳转运的机制。各种类型的膜支撑，例如氧化铝，诸如银色电导支撑等惰性膜支撑，以及氧化物离子导电材料，例如钙钛矿，都导致不同的运输机制。尽管运输方法往往是相互排斥的，但努力旨在结合多种方法，从而导致较高的通量。这促进了混合离子电子传导支持的发展，促进氧化物离子和电子传导。这项研究将通过一系列光谱，渗透和衍射技术探测传输机制，以研究两者之间的固体支持，MS和界面。关键的查询将集中于阐明MS的物种形成，了解离子转运在任一或两个阶段的作用，并识别新型的界面物种。该项目旨在揭示对双相熔融盐膜中二氧化碳分离机制的进一步见解。