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    • 2019-11-26 16:25:00
    • Article ID: 723237

    Big trucks, little emissions

    • Credit: Shutterstock / Mihai_Andritoiu

      Scientists have discovered that a new ethanol conversion approach can reduce greenhouse gas emissions between 40 and 96 percent, according to a new study, released on Nov. 25.

    One way of increasing sustainability is to reduce carbon fuel emissions within transportation. In 2017 greenhouse gas emissions (GHG) from this sector surpassed all others in the U.S., accounting for nearly 30% of total GHG emissions, according to the United States Environmental Protection Agency.

    One strategy researchers are exploring for lowering emissions is to produce renewable fuels, like renewable jet fuel, with biofuel production already in place, such as ethanol — a fuel that is low cost, cleaner burning and widely available. But for this strategy to work, ethanol has to first be converted to a hydrocarbon fuel, a step that could add to overall costs.

    A pioneering study released today reveals Vertimass’ new integrated, cost-efficient way of converting ethanol for fuel blends that can reduce greenhouse gas emissions between 40 and 96 percent. The discovery marks a major advance in the development of drop-in, or interchangeable, biofuels and can promote research to advance their use in aviation, shipping, long-haul truck and other forms of heavy-duty transportation.

    The multidisciplinary team behind the discovery represents a wide range of academic and industry institutions and includes researchers from the U.S. Department of Energy’s (DOE) Argonne National Laboratory, as well as DOE’s National Renewable Energy Laboratory and Oak Ridge National Laboratory.

    The researchers behind the study developed their new approach for converting ethanol using the latest advances in catalysis and process development. Unlike traditional methods which require three steps, new advances let researchers create a conversion process that combined all three steps, a measure that could lower the cost of conversion and environmental footprint.

    To understand the full-scale impacts of their one-step conversion process, called Consolidated Alcohol Dehydration and Oligomerization, or CADO, researchers evaluated the environmental impacts of their system via a process called life-cycle analysis. Researchers also evaluated the technical and economic impacts of their approach.

    To tackle this process, the team turned to the research group at Argonne that works on the Greenhouse Gases, Regulated Emissions, and Energy use in Transportation (GREET) model, a powerful analytical tool that simulates energy use and environmental outputs of various vehicle and fuel systems. Used by nearly 40,000 people worldwide, the GREET platform can analyze multiple vehicle and/or fuel systems, from when raw materials are mined or extracted to when they are disposed or emitted, to calculate the energy use and emission levels throughout.

    “GREET is one of the only tools out there that can provide a complete picture of the energy and environmental impacts of an entire vehicle and fuel system,” said Michael Wang, the leader of the GREET team at Argonne, and one of the co-authors of the study.

    Argonne researchers used GREET to calculate the life cycle GHG emissions produced by hydrocarbon fuels made from different raw materials and conversion methods. Some of the raw materials — also known as feedstocks — analyzed were corn and sugarcane, which are first generation feedstocks, as well as sugarcane straw and corn stover, which are non-food biomass, or the second generation feedstocks.

    “Variations in the feedstock used to make ethanol and pathways used to convert it, yield different levels of GHG emissions,” said Argonne energy systems analyst Pahola Thathiana Benavides, another co-author.

    Wang and Benavides’ analysis showed that hydrocarbon blends made using the CADO conversion process reduced greenhouse gas emissions anywhere from between 40% up to 96% depending on the feedstock and the conversion pathway. GHG emissions fell by 40% with corn grain, 70% with sugarcane juice and 70-96% with cellulosic biomass such as sugarcane straw and corn stover.

    “In order to move towards more sustainable development, we will need fuels that can generate fewer emissions and that are economically feasible,” Benavides said. “This work is an exciting indicator that building such a future is possible.”

    The study, "Technoeconomic and life cycle analysis of single-step catalytic conversion of wet ethanol into fungible fuel blendstocks," is published in the Proceedings of the National Academy of Sciences.

    Organizations involved the study include Vertimass LLC, Dartmouth College, Boeing, Argonne National Laboratory, the National Renewable Energy Laboratory, the Federal Aviation Administration, the Brazilian Bioethanol Science and Technology Laboratory, the Brazilian Center for Research in Energy and Materials, DOE’s Oak Ridge National Laboratory, Pennsylvania State University, Imperial College London, and the University of California, Riverside.

    This work was funded by the Bioenergy Technologies Office within DOE’s Energy Efficiency and Renewable Energy Office (EERE), by Vertimass LLC, and by the Center for Bioenergy Innovation, a DOE Bioenergy Research Center supported by the Office of Biological and Environmental Research within DOE’s Office of Science.

    The GREET platform is supported DOE’s Office of Energy Efficiency and Renewable Energy.

    The Office of Energy Efficiency and Renewable Energy supports early-stage research and development of energy efficiency and renewable energy technologies to strengthen U.S. economic growth, energy security, and environmental quality.

    Argonne National Laboratory seeks solutions to pressing national problems in science and technology. The nation’s first national laboratory, Argonne conducts leading-edge basic and applied scientific research in virtually every scientific discipline. Argonne researchers work closely with researchers from hundreds of companies, universities, and federal, state and municipal agencies to help them solve their specific problems, advance America’s scientific leadership and prepare the nation for a better future. With employees from more than 60 nations, Argonne is managed by UChicago Argonne, LLC for the U.S. Department of Energy’s Office of Science.

    The U.S. Department of Energy’s Office of Science is the single largest supporter of basic research in the physical sciences in the United States and is working to address some of the most pressing challenges of our time. For more information, visit https://energy.gov/science.

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