直接空气捕集（DAC）为什么比从电厂点源捕集贵得多，目前靠什么降低能耗？
Why is direct air capture (DAC) far more expensive than capturing CO2 from point sources like power plants, and how is energy use being reduced?
空气中CO2浓度仅约万分之四，要处理巨量空气且结合很弱，所以能耗和成本极高。DAC 靠高选择性固体/液体吸附剂、低温余热和风电光伏供电来压低单位成本。
Air holds only about 400 ppm CO2, requiring huge air handling with weak binding, so energy and cost are extreme. DAC relies on selective solid/liquid sorbents, low-grade heat and renewable power to cut per-ton cost.
难度 专业 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
Lackner，《从环境空气中捕集二氧化碳》，《能源》32卷，491–495页（2007）
Lackner, K.S. 'Carbon dioxide capture from ambient air.' Energy 32, 491–495 (2007)
#DAC #直接空气捕集 #吸附剂
CCUS 中的“U”（利用）和“S”（封存）在地质安全性上最大的担忧是什么？
In CCUS, what are the biggest geological-safety concerns with the U (utilization) and especially S (storage) parts?
深海或地层封存最怕CO2泄漏回到大气，或注入改变地应力诱发微小地震。长期监测、盖层完整性和泄漏预警是确保安全的关键，封存点要选在封闭性极好的储层之上。
Deep-sea or geological storage risks CO2 leaking back to the atmosphere or inducing small quakes by changing stress. Long-term monitoring, caprock integrity and leak warning are essential, with storage chosen above tightly sealed reservoirs.
难度 专业 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#CCUS #地质封存 #泄漏
电厂烟气用胺法捕集二氧化碳，为什么捕集后还需要大量蒸汽把二氧化碳“解吸”出来？
In amine-based CO2 capture from flue gas, why is a lot of steam then needed to desorb the captured CO2?
胺溶剂靠可逆化学键“抓住”二氧化碳，要把它释放出来必须加热打破该键，这一步叫再生，蒸汽提供了热量。再生能耗正是胺法捕集最贵、最影响经济性的环节。
Amine solvent captures CO2 by a reversible chemical bond that must be broken by heat to release it—a step called regeneration that consumes steam. This regeneration energy is the costliest, most economy-limiting part of amine capture.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Rochelle，《胺法捕集二氧化碳》，《科学》325卷，1652–1654页（2009）
Rochelle, G.T. 'Amine Scrubbing for CO2 Capture.' Science 325, 1652–1654 (2009)
独立核验依据 · Independent verification: 核验依据 1 EUROPEPMC 标识 19779188：Amine scrubbing for CO2 capture.（按
#碳捕集 #胺法 #再生能耗
被捕集的二氧化碳除了封存，还能“变废为宝”做成什么？
Besides storage, what useful things can captured CO2 be turned into?
它可加氢制成合成燃料和甲醇，用于增强采油，或注入混凝土养护加速硬化，也能做成塑料和化学品原料。把碳“圈”在产品中比单纯封存更有经济价值。
It can be hydrogenated into synthetic fuels and methanol, used for enhanced oil recovery, injected into concrete to speed curing, or made into plastics and chemical feedstocks. Locking carbon in products is often more valuable than mere storage.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Aresta 编，《二氧化碳作为化工原料》（Wiley, 2010）
Aresta, M. (ed.), 'Carbon Dioxide as Chemical Feedstock' (Wiley, 2010)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL21434549W：Carbon Dioxide As Chem
#CO2利用 #合成燃料 #矿化