The widespread adoption of direct air capture (DAC) is necessary for achieving net-zero emissions by 2050. However, on-site DAC development faces challenges like inconsistent technical solutions and significant initial investment. The proposal of mobile DAC offers an alternative technical route to scaling up DAC through distributed deployment, introducing a brand-new application scenario. Two types of mobile DAC are concerned, including integrating DAC with the existing transportation equipment and specialized mobile DAC devices for sniffing and capturing CO. The detailed discussions cover the fundamental operation strategies and performance evaluation. Firstly, the mobile DAC in vehicles and ships is reviewed, focusing on integrating conventional DAC systems with common transportation. Then, the specialized devices for CO sniffing and capturing, i.e., mobile DAC in low- and high-altitude aircraft, are proposed. This review envisions a future where mobile DAC technology is widely deployed in various human activity spaces, serving as a standard negative-emission solution.

中文翻译：

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移动直接空气捕获的批判性评论：概念扩展、特征描述和性能评估

广泛采用直接空气捕获 (DAC) 对于到 2050 年实现净零排放是必要的。然而，现场 DAC 开发面临着技术解决方案不一致和大量初始投资等挑战。移动DAC的提出为通过分布式部署扩展DAC提供了另一种技术路线，引入了全新的应用场景。涉及两种类型的移动DAC，包括将DAC与现有运输设备集成以及用于嗅探和捕获CO的专用移动DAC设备。详细讨论了基本操作策略和性能评估。首先，回顾了车辆和船舶中的移动DAC，重点关注传统DAC系统与公共交通的集成。然后，提出了用于CO嗅探和捕获的专用设备，即低空和高空飞机中的移动DAC。本次审查展望了未来移动 DAC 技术将广泛部署在各种人类活动空间中，作为标准的负排放解决方案。