Multi-stimuli Responsive Smart Hydrogels for Energy-Efficient CO2 capture

用于节能二氧化碳捕获的多重刺激响应智能水凝胶

• 批准号: EP/R001308/1
• 负责人: Chenggong Sun
• 金额: $ 25.78万
• 依托单位: University of Nottingham
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FR001308%2F1
• 关键词: Multi; stimuli; Responsive; Smart; Hydrogels

Carbon capture and storage (CCS) has widely been considered, both globally and in the UK, as a crucial part of global low carbon energy portfolio required to control the rise in global mean temperature below 2 degree C above pre-industrial levels. CCS is the only technology available that can achieve deep reductions in carbon emissions from both power generation and industrial processes in the short-to-medium term, with carbon capture representing the first and most costly single element of the whole CCS chain. Aqueous amine scrubbing at its various forms is currently the best available technology and has been demonstrated at various scales. However, despite the intensive developments at various scales over recent years, its large energy penalty, equivalent up to 20% of a typical power plant output, still remains a major performance barrier. Clearly, new cost-effective and energy-efficient capture concepts leading to substantial reductions in energy penalty need to be explored. Prompted by recent research in areas of thermo-responsive hydrogels which has led to successful applications in advanced target separations, this proposal aims to develop a new concept of CO2 scrubbing with photo-thermo dual-responsive smart hydrogels, which is expected to be substantially more energy-efficient than amine scrubbing. In this new capture concept, functionalised smart hydrogels, which are mechno-chemically responsive to both heat and sunlight radiation, are used as the absorbent for CO2 capture. The rapid response of the hydrogels to heat and/or light combined with the induced pH swing can facilitate rapid sorbent regeneration/CO2 recovery under much milder conditions. It is anticipated that the temperature swing range for sorbent regeneration can be narrowed to as low as 20-30 degree C, from ca. 70-90 degree C for amine scrubbing. More importantly, the photo-thermo dual-responsive hydrogels-based CO2 capture could potentially make it possible to make use of low grade heat and/or sunlight or solar radiation to drive the CO2 capture system. The major objectives include:(i) To develop photo-thermal dual responsive hydrogels with high reversible CO2 absorption capacities and favourable volume phase transition behaviours;(ii) To characterise the physicochemical properties and the CO2 absorption/desorption characteristics of different dual-responsive hydrogels under various temperature swing and light radiation conditions to identify the best-performing smart hydrogels for CO2 capture.(iii) Once the optimal hydrogels have been identified, scale-up production of the hydrogels will be carried out to perform cyclic CO2 scrubbing tests with the smart hydrogels, using the purpose-designed lab-scale film and column absorbers under different thermal swing conditions with and without light radiation at variable intensities. The test results will be used to assess the feasibility of this new CO2 scrubbing concept to facilitate further development and scale-up of the technology.

碳捕集与封存 (CCS) 在全球和英国都被广泛认为是全球低碳能源组合的重要组成部分，需要将全球平均气温上升控制在工业化前水平以上 2 摄氏度以下。 CCS 是唯一可以在中短期内大幅减少发电和工业流程碳排放的可用技术，其中碳捕获是整个 CCS 链中第一个也是成本最高的单一要素。各种形式的水胺洗涤是目前最好的可用技术，并已在不同规模上得到验证。然而，尽管近年来在不同规模上进行了密集的开发，但其巨大的能源损失（相当于典型发电厂输出的 20%）仍然是主要的性能障碍。显然，需要探索新的具有成本效益和能源效率的捕获概念，从而大幅减少能源损失。受最近热响应水凝胶领域研究的推动，该研究已在先进目标分离中取得成功应用，该提案旨在开发一种光热双响应智能水凝胶二氧化碳洗涤的新概念，预计将比胺洗涤更加节能。在这个新的捕获概念中，功能化智能水凝胶对热和阳光辐射具有机械化学响应，被用作二氧化碳捕获的吸收剂。水凝胶对热和/或光的快速响应与诱导的 pH 值波动相结合，可以促进吸附剂在更温和的条件下快速再生/二氧化碳回收。预计吸附剂再生的温度波动范围可以从大约 20-30 摄氏度缩小到低至 20-30 摄氏度。 70-90°C 用于胺洗涤。更重要的是，基于光热双响应水凝胶的二氧化碳捕获可能使利用低品位热量和/或阳光或太阳辐射来驱动二氧化碳捕获系统成为可能。主要目标包括：（i）开发具有高可逆CO2吸收能力和良好体积相变行为的光热双响应水凝胶；（ii）表征不同双响应水凝胶在不同温度波动和光辐射条件下的物理化学性质和CO2吸收/解吸特性，以确定用于CO2捕获的最佳性能的智能水凝胶。 在确定了最佳水凝胶后，将进行水凝胶的放大生产，以利用智能水凝胶进行循环二氧化碳洗涤测试，使用专门设计的实验室规模的薄膜和柱吸收器，在不同的热变条件下，有或没有不同强度的光辐射。测试结果将用于评估这种新的二氧化碳洗涤概念的可行性，以促进该技术的进一步开发和规模化。

项目成果

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Modulating active oxygen species on a-MnO 2 with K and Pb for SCR of NO at low temperatures

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• DOI: 10.1039/d3cy01068f
• 发表时间: 2023
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• 发表时间: 2020-12
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