Big trucks, little emissions

November 26, 2019

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."
-end-
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.

DOE/Argonne National Laboratory

Related Ethanol Articles from Brightsurf:

Spraying ethanol to nanofiber masks makes them reusable
A joint research team from POSTECH and Japan's Shinshu University evaluates the filtration efficiency of nanofiber and melt-blown filters when cleaned with ethanol.

Anaerobically disinfect soil to increase phosphorus using diluted ethanol
Anaerobic disinfection of soil is an effective method to kill unwanted bacteria, parasites and weeds without using chemical pesticides.

Fractionation processes can improve profitability of ethanol production
The US is the world's largest producer of bioethanol as renewable liquid fuel, with more than 200 commercial plants processing over 16 billion gallons per year.

Ethanol fuels large-scale expansion of Brazil's farming land
A University of Queensland-led study has revealed that future demand for ethanol biofuel could potentially expand sugarcane farming land in Brazil by 5 million hectares by 2030.

Measuring ethanol's deadly twin
ETH Zurich researchers have developed an inexpensive, handheld measuring device that can distinguish between methanol and potable alcohol.

Modified enzyme can increase second-generation ethanol production
Using a protein produced by a fungus that lives in the Amazon, Brazilian researchers developed a molecule capable of increasing glucose release from biomass for fermentation.

Scientists develop a chemocatalytic approach for one-pot reaction of cellulosic ethanol
Scientists at the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences have developed a chemocatalytic approach to convert cellulose into ethanol in a one-pot process by using a multifunctional Mo/Pt/WOx catalyst.

New core-shell catalyst for ethanol fuel cells
Scientists at Brookhaven Lab and the University of Arkansas have developed a highly efficient catalyst for extracting electrical energy from ethanol, an easy-to-store liquid fuel that can be generated from renewable resources.

Yeast makes ethanol to prevent metabolic overload
Why do some yeast cells produce ethanol? Scientists have wondered about this apparent waste of resources for decades.

Corncob ethanol may help cut China's greenhouse gas emissions
A new Biofuels, Bioproducts and Biorefining study has found that using ethanol from corncobs for energy production may help reduce greenhouse gas emissions in China, if used instead of starch-based ethanol.

Read More: Ethanol News and Ethanol Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.