Economically advantageous pathways for reducing greenhouse gas emissions from industrial hydrogen under common, current economic conditions
- 15 February 2021
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Energy & Environmental Science
- Vol. 14 (3), 1517-1529
- https://doi.org/10.1039/d0ee03768k
Abstract
Hydrogen is a major industrial chemical whose manufacture is responsible for ∼3% of global carbon dioxide emissions. >95% of hydrogen is made via reforming fossil fuels which typically co-produces hydrogen and waste carbon dioxide. Nearly all other hydrogen is co-produced with other commodity chemicals. Unfortunately, many alternative, clean hydrogen production processes are small-scale because they require major reductions in capital cost or energy prices to be economical enough for industry. Because the climate problem is urgent, and the economics of future energy is uncertain, this paper seeks to expand the options for producing industrial-scale, clean hydrogen under common, present-day economic conditions. First, we build a model to understand the economic and carbon dioxide emissions constraints of sulfur electrolysis which is an emerging process that cogenerates hydrogen and co-salable sulfuric acid and has the potential to produce up to 36% of the world's current hydrogen demand under present-day, average US economic conditions. We also use our model to evaluate water electrolysis, which cogenerates hydrogen and waste oxygen, but is not economical under present-day average US economic conditions. We then propose criteria for identifying clean hydrogen production chemistries. Using these criteria, we find enough reactions to have the combined potential to make over 150% of the world's industrial hydrogen needs under present-day, average US economic conditions while reducing cost and reducing or eliminating CO2 emissions. Given the urgency of the climate problem, we believe that an economic analysis, such as this is crucial to near-term CO2 emissions reductions.Keywords
Funding Information
- U.S. Department of Energy (DE-SC0004993)
This publication has 31 references indexed in Scilit:
- Five thermal energy grand challenges for decarbonizationNature Energy, 2020
- Global hydrogen market insights, 2020-2024 by production process, end-user, generation system and regionFocus on Catalysts, 2020
- Electrified methane reforming: A compact approach to greener industrial hydrogen productionScience, 2019
- Enhancing the activity of oxygen-evolution and chlorine-evolution electrocatalysts by atomic layer deposition of TiO2Energy & Environmental Science, 2018
- Levelized cost of CO2mitigation from hydrogen production routesEnergy & Environmental Science, 2018
- Life Cycle Greenhouse Gas Emissions of By-product Hydrogen from Chlor-Alkali PlantsPublished by Office of Scientific and Technical Information (OSTI) ,2017
- A comparative technoeconomic analysis of renewable hydrogen production using solar energyEnergy & Environmental Science, 2016
- Hydrogen production via thermochemical water splittingPublished by Elsevier BV ,2015
- Designing Climate Change Mitigation Plans That Add UpEnvironmental Science & Technology, 2013
- A review on exergy comparison of hydrogen production methods from renewable energy sourcesEnergy & Environmental Science, 2012