A roadmap for achieving scalable, safe, and low-cost direct air carbon capture and storage

Abstract

Direct air carbon capture and storage (DACCS) involves a set of approaches for capturing CO2 directly from the air and its subsequent long-term storage. DACCS is at an early stage...

Tuning sorbent properties to reduce the cost of direct air capture

“…The choice of energy source has a substantial impact on the climate change impact and carbon footprint of DAC. 12,60,61,68–70 Non-renewable energy sources, such as petroleum and coal, emit high amounts of carbon dioxide per MW h of energy produced, while low-carbon sources like wind, hydropower, and nuclear emit much less CO 2 . The choice of energy source has a large influence on the total DAC carbon footprint, illustrated in Fig.…”

Utilizing CO2 as a strategy to scale up direct air capture may face fewer short-term barriers than directly storing CO2

“…cost reduction for each doubling of cumulative installed capacity) expected for DAC technologies lie at 10%-15% [11], similar to wind power but lower than historically observed for PV [17,18]. To stimulate learning effects and concomitantly lower costs, large-scale deployment of DAC technology is essential [15,18]. This could be achieved by directly deploying DACCS for carbon removal, which would result in immediate negative emissions.…”

“…Around 80% of the current cost of DACCS arises from the direct air capture (DAC) process [10][11][12][13][14][15][16]. Estimates of the learning rate (i.e.…”

“…Largely, this option has been ignored. Most literature on DAC separately focused on either the CO 2 capture component [5,7,10,11,20,[35][36][37][38][39][40][41], its deployment for CO 2 storage [3,9,15,21,28,42,43], or its deployment for CO 2 utilization [22][23][24][44][45][46][47][48][49]. However, these studies did not aim to directly compare different uses of DAC, but rather assessed in isolation either their role in future mitigation scenarios [3-5, 7, 50], their techno-economic performance [11,22,24,25,32,35,36,38,39,44,47,51], their lifecycle emissions [9,23,36,40,41,45], possible markets [30,…”

Water management and heat integration in direct air capture systems

“…Direct air capture (DAC) is a promising technological solution for mitigating the rising global average temperatures and associated consequences. Although various absorption, adsorption and electrochemical separation methods have been proposed for removing CO 2 from air, most struggle with the challenge of meeting cost targets [1][2][3] . These processes, though different in material structure, cycle design and unit configurations, encounter a common adversary that limits their economic viability-water.…”