On the climate change mitigation potential of CO2 conversion to fuels,Energy & Environmental Science

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On the climate change mitigation potential of CO2 conversion to fuels
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2017-11-20 00:00:00 , DOI: 10.1039/c7ee02819a
J. Carlos Abanades _{1,

2,

3,

4,

5} , Edward S. Rubin _{6,

7,

8,

9} , Marco Mazzotti _{10,

11,

12,

13} , Howard J. Herzog _{9,

14,

15,

16}

Affiliation

CO₂ capture and conversion to fuels using renewable energy is being promoted as a climate change mitigation measure that reduces fossil fuel use by effectively recycling carbon. We examine this claim, first for a typical CO₂ capture and utilization (CCU) system producing methanol (MeOH), and then for a generalized system producing fuels from fossil carbon. The MeOH analysis shows CCU to be an inferior mitigation option compared to a system with CCS producing the same fuel without CO₂ utilization. CCU also is far more costly. The generalized analysis further reveals that the mitigation potential of CCU for fuels production is limited to 50% of the original emissions of the reference system without CCU. We further highlight that the main challenge to CCU cost reduction is not the CO₂-to-fuel conversion step but the production of required carbon-free electricity at very low cost.

中文翻译：

关于缓解气候变化的潜力，将CO ₂转化为燃料

作为减少气候变化的措施，通过有效地循环利用碳来减少化石燃料的使用，正在推广使用CO ₂捕集并利用可再生能源转化为燃料。我们首先针对产生甲醇（MeOH）的典型CO ₂捕集和利用（CCU）系统，然后针对由化石碳生产燃料的通用系统检查此主张。MeOH分析表明，与采用CCS生产无CO ₂相同燃料的系统相比，CCU的减排效果较差利用率。CCU的成本也高得多。广义分析进一步表明，CCU减少燃料生产的潜力被限制为不带CCU的参考系统原始排放量的50％。我们进一步强调，降低CCU成本的主要挑战不是以CO ₂为燃料的转化步骤，而是以非常低的成本生产所需的无碳电力。

更新日期：2017-11-20

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