Powering photoreactions with inductively coupled wireless light emitters located inside the reaction medium

使用位于反应介质内的电感耦合无线光发射器为光反应提供动力

• 批准号: 419142041
• 负责人: Dr. Jonathan Bloh
• 金额: --
• 依托单位: Arbeitsgruppe Technische Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/419142041?language=en
• 关键词: Powering; photoreactions; inductively; coupled; wireless

Photocatalysis is the activation or acceleration of a chemical reaction by the presence of light (photons). The importance of photocatalysis in fundamental and applied sciences expanded rapidly over the last decades, especially as they are often reported as resource-efficient and sustainable. Photons are essentially traceless and, in the case of sunlight, carbon neutral reagents.However, industrial implementation of these reactions is technically challenging. Engineering limitations such as illumination efficiency and the need for special reactor designs are the main reasons for those processes still being limited to a few selected cases. Especially in the case of high catalyst loadings the penetration depth of light into the reactor, which typically does not exceed a few millimeters, is a limiting factor. Reactors for those processes need a large surface compared to their volume. Very thin reactors show better illumination efficiencies but are very area intensive in scale-up. Therefore, the requirement of specific expensive photoreactors is often a substantial obstacle for implementation in industrial scales. Internal illumination can be a solution. It is a promising technique that achieves good illumination efficiency and enables a more flexible choice of reactor types.Compared to classical methods for internal illumination, we propose resonant inductive coupling (RIC) for the powering of internal light sources, further called Wireless Light Emitters (WLEs). Since the light sources themselves can easily be added to or separated from the reactor, it allows for more flexibility in selecting a suitable reactor. Even standard multi-purpose reactors could be used. In this project, we propose utilizing WLEs to power photocatalytic reactions, which could tremendously help to wide-spread applications. Resonant inductive coupling (RIC) shows great potential for wireless powering of LED devices as the possible energy transfer efficiency is already >75% and the conductivity of water shows no negative impact on the energy transfer efficiency. Since there are already many well-known applications for RIC such as charging of smart phones and tooth brushes, synergetic effects in future developments can be expected. LEDs powered by RIC were already successfully introduced as a means to illuminate photobioreactors. The employed magnetic field is in the order of 1mT (magnetic flux density) at a frequency of about 178 kHz and is comparable to induction cooktops. While a magnetic field effect (MFE) has been proposed to affect diffusion and charge separation in the semiconductor particles, this was only observed for magnetic fields orders of magnitude higher and with controversial results. Also, the reports of positive effects on the reactivity far outweigh the negative ones so this is very unlikely to present a problem in the envisioned application.

光催化是通过光(光子)的存在来激活或加速化学反应。光催化在基础科学和应用科学中的重要性在过去几十年里迅速扩大，特别是因为它们经常被报道为资源高效和可持续的。光子本质上是无迹可寻的，在太阳光的情况下，是碳中性试剂。然而，这些反应的工业实现在技术上是具有挑战性的。工程上的限制，如照明效率和特殊反应堆设计的需要，是这些工艺仍限于少数几个选定案例的主要原因。特别是在高催化剂负载量的情况下，光对反应器的穿透深度是一个限制因素，通常不超过几毫米。与其体积相比，这些过程中的反应堆需要更大的表面积。非常薄的反应器显示出更好的照明效率，但在扩大规模时面积非常密集。因此，对特殊昂贵的光反应堆的要求往往是工业规模实施的一个重大障碍。内部照明可以是一种解决方案。与经典的内部照明方法相比，我们提出了一种用于内部光源供电的共振感应耦合(RIC)技术，也称为无线光发射器(WLEs)。由于光源本身可以容易地添加到反应器中或从反应器中分离，因此在选择合适的反应器时允许更大的灵活性。即使是标准的多用途反应堆也可以使用。在这个项目中，我们提出利用WLEs来驱动光催化反应，这将极大地有助于广泛的应用。谐振式电感耦合(RIC)在LED器件的无线供电方面显示出巨大的潜力，因为可能的能量传递效率已经达到&gt；75%，而且水的导电性对能量传递效率没有负面影响。由于RIC已经有许多众所周知的应用，如智能手机和牙刷的充电，可以预期在未来的发展中会产生协同效应。由RIC供电的LED已经被成功地引入作为照明光生物反应器的一种手段。使用的磁场约为1mT(磁通密度)，频率约为178 kHz，可与电磁炉相媲美。虽然已经提出了磁场效应(MFE)来影响半导体粒子中的扩散和电荷分离，但这只在较高数量级的磁场中观察到，并且结果存在争议。此外，关于反应性的积极影响的报道远远超过消极影响的报道，因此这在设想的应用中不太可能出现问题。