气候变化领域集成服务门户(CCPortal): Cost modeling of photocatalytic decomposition of atmospheric methane and nitrous oxide

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DOI	10.1088/1748-9326/ad4376
	Cost modeling of photocatalytic decomposition of atmospheric methane and nitrous oxide
	Randall, Richard; Jackson, Robert B.; Majumdar, Arun
发表日期	2024
ISSN	1748-9326
起始页码	19
结束页码	6
卷号	19 期号:6
英文摘要	The photocatalytic decomposition of atmospheric methane (CH4) and nitrous oxide (N2O) could be valuable tools for mitigating climate change; however, to date, few photocatalyst deployment strategies have had their costs modeled. Here, we construct basic cost models of three photocatalytic CH4 and N2O decomposition systems: (1) a ground-based solar system with natural airflow over photocatalyst-painted rooftops, (2) a ground-based LED-lit system with fan-driven airflow, and (3) an aerosol-based solar system on solid particles dispersed in the atmosphere. Each model takes as inputs the photocatalyst's apparent quantum yield (AQY; a measure of how efficiently photons drive a desired chemical reaction) and the local CH4 or N2O concentration. Each model calculates an overall rate of greenhouse gas (GHG) drawdown and returns a levelized cost of GHG removal per equivalent ton of carbon dioxide (tCO(2)e). Based on prior studies of atmospheric carbon dioxide removal, we adopt $100/tCO(2)e as a target cost. We estimate that painting rooftops with photocatalysts might meet the target cost for decomposition of >10 ppm CH4 with catalyst AQYs >4%. If painting and cleaning costs were reduced by a factor of similar to 3 from our scenario, removal of ambient CH4 could meet the cost target with AQYs >1% and removal of ambient N2O could do so with AQYs >0.1%. Fan-driven systems with LED illumination appear to be very challenging, achieving removal costs <$100/tCO(2)e only for AQYs of >10% for CH4 and >1% for N2O. Dispersing photocatalytic aerosols in the troposphere could be cost-effective with AQYs of >0.4% for ambient CH4 or >0.04% for ambient N2O. However, the mass of aerosols required is large and their side effects and social acceptability are uncertain. We note that, for any system, AQYs on the order of 1% will likely be extremely challenging to achieve with such dilute reagents.
英文关键词	methane mitigation; technoeconomic analysis; negative emissions; greenhouse gas removal; methane removal; nitrous oxide removal
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001222365900001
来源期刊	ENVIRONMENTAL RESEARCH LETTERS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/304649
作者单位	Stanford University; Stanford University; Stanford University; Stanford University
推荐引用方式 GB/T 7714	Randall, Richard,Jackson, Robert B.,Majumdar, Arun. Cost modeling of photocatalytic decomposition of atmospheric methane and nitrous oxide[J],2024,19(6).
APA	Randall, Richard,Jackson, Robert B.,&Majumdar, Arun.(2024).Cost modeling of photocatalytic decomposition of atmospheric methane and nitrous oxide.ENVIRONMENTAL RESEARCH LETTERS,19(6).
MLA	Randall, Richard,et al."Cost modeling of photocatalytic decomposition of atmospheric methane and nitrous oxide".ENVIRONMENTAL RESEARCH LETTERS 19.6(2024).