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Showing posts sorted by date for query ETHANOL. Sort by relevance Show all posts

Saturday, July 18, 2026

 

Driving the speed limit cuts millions in fuel costs for less than a minute of your time



New study finds an immediate, cost-effective solution by analyzing 120 million real-world trips



University of Minnesota






MINNEAPOLIS / ST. PAUL (07/16/2026) - A nationwide study by researchers at the University of Minnesota Twin Cities reveals that adherence to posted speed limits could dramatically curb U.S. fuel consumption and greenhouse gas emissions, saving Americans billions of dollars annually while adding less than a minute to the average daily commute.

The paper was recently published in Communications Sustainability, a peer-reviewed journal.

Researchers analyzed over 120 million real-world vehicle trips across the United States, showing that if drivers complied with posted speed limits, it could save an average of $22 million, 6.7 million gallons of fuel and 57,000 metric tonnes of carbon dioxide every single day for light-duty engine-powered vehicles — which account for 14.6% of total energy consumption in the country.

“We already understand the physics of how speed affects fuel consumption, but quantifying the exact magnitude of those savings at a national scale gives us a clearer picture of the actual impact,” said Bharat Jayaprakash, Ph.D. student in the Department of Mechanical Engineering at the University of Minnesota and lead author on the paper.

Previous transportation research relied on localized, small-scale samples or general assumptions about fuel economy based on laboratory tests. This project marks a major milestone in transportation science. With volatile fuel prices and uncertainty about the expansion of electric vehicles in the marketplace, the study shows that changing driver behavior offers an immediate, cost-effective tool for reducing fuel use and emissions.

The researchers were able to review a large amount of data including driving data on U.S. road networks, speed limits and elevation data from the U.S. Geological Survey. They then calibrated multiple, vehicle specific energy-consumption models using advanced vehicle dynamics software developed by the National Laboratory of the Rockies, formerly known as the National Renewable Energy Laboratory.

“While internal combustion engine-powered vehicles have become significantly more efficient in the past decades, they have also become much more powerful. Driving fast is easier than ever,” said William Northrop, University of Minnesota mechanical engineering professor and corresponding author on the paper. “Our study examines an obvious yet difficult-to-implement intervention for major fuel savings that can be achieved without replacing our cars: driving slower.” 

The researchers noted that more work is needed to fully understand the impact of driving on fuel and emissions.

“Key remaining challenges of our research are to expand our framework to more diverse roadways and understand the impacts of aggressive accelerations on fuel use and emissions,” added Northrop. “Exploring both speed and acceleration reductions will give us an even more complete picture of real-world fuel savings potential."

Future phases of the project will utilize an instrumented electric vehicle equipped with multi-sensor perception systems to capture micro-scale driving behavior in real time. Sponsored by the Minnesota Department of Transportation’s Local Road Research Board, current research focuses on collecting high-fidelity, real-world drive cycles to precisely model how micro-scale driving habits impact energy consumption and emissions at the fleet level.

The research was partially supported by the National Science Foundation. 

Read the entire paper, entitled “Speeding incurs substantial environmental and economic costs nationwide for negligible travel time savings, on the Nature website.

 

Repsol Supplies First Bioethanol to Maersk in the Port of Barcelona

Barcelona

Published Jul 17, 2026 8:16 PM by The Maritime Executive

[By Repsol]

Repsol has successfully supplied 2,800 tons of bioethanol to a Maersk container vessel, Antonia Maersk, in the first bunkering operation of its kind in the Port of Barcelona and one of the first in the Mediterranean. 

The operation demonstrates growing demand for alcohol-based marine fuels, as well as the readiness of the infrastructure, logistics, and operational capabilities required to support their deployment at commercial scale. It also highlights the readiness of the wider value chain needed to support the deployment of other alcohol-based marine fuels, including methanol. 

This operation further strengthens Repsol's multi-energy offering, combining conventional marine fuels, renewable fuels, and emerging low-carbon solutions to help customers advance their decarbonization strategies. 

Juan Abascal, Repsol's Executive Managing Director of Industrial Transformation and Circular Economy, said: "With this supply, we reaffirm our commitment to the decarbonization of maritime transport through solutions that are available today and ready to scale in the future. At Repsol, we provide shipping companies with a reliable supply chain and a multi-energy strategy that combines different renewable fuels to support the sector in a safe, competitive, and sustainable transition". 

The supply took place in the Port of Barcelona under fully commercial conditions, bringing together key players across the maritime value chain and demonstrating how collaboration can accelerate the adoption of lower-emission solutions in shipping. 

The delivery was carried out by Bahía Candela, Repsol's newest bunker vessel, operated by Mureloil and designed to supply both conventional marine fuels and next-generation energy products. During the bunkering operation, Bahía Candela operated using its battery system, enabling the fuel transfer to be completed with zero local emissions, and further reducing the environmental footprint of the operation. 

Prior to the bunkering, Maersk tested ethanol on one of its smaller vessels, the 1,800 TEU feeder vessel Laura Maersk, which in 2023 became the world's first dual-fuel container vessel able to operate on methanol. Today, Maersk has 23 dual-fuel container vessels designed to operate on methanol; however, the company continues to explore ethanol as an alternative fuel for its methanol-enabled vessels. Laura Maersk has performed sailings on 100% ethanol as well as blends of ethanol and methanol. 

"Following the successful ethanol trials conducted on Laura Maersk, this latest bunkering of Antonia Maersk marks another important step in our efforts to explore scalable low-emission fuel solutions. As the first ethanol trial on one of our large dual-fuel vessels, with a capacity of 16,000 TEU, it allows us to deepen our understanding of ethanol's operational potential at scale. Building on the experience we have gained with methanol, we are working closely with port authorities and industry partners to develop the infrastructure and procedures needed to support ethanol bunkering. Ethanol is one of several pathways we are pursuing to diversify our future fuel portfolio and help accelerate the development of new, viable liquid marine fuel markets", said Emma Mazhari, Vice President Energy Markets at Maersk. 

José Alberto Carbonell, President of the Port of Barcelona, highlighted: "This operation demonstrates that the Port of Barcelona is ready to support the deployment of new low-carbon fuels at scale, as part of our Energy Transition Plan. As the Mediterranean's leading logistics and energy hub, we are committed to providing the infrastructure, operational capabilities and collaborative environment needed to accelerate the maritime sector's decarbonisation. Projects like this show how ports, shipping companies and energy providers can work together to turn the energy transition into a reality". 

The successful completion of this operation sends a clear message to the industry: alcohol-based marine fuels can already be supplied efficiently and scaled quickly. 

The experience gained through the collaboration between Repsol, Maersk, Mureloil and the Port of Barcelona provides a practical blueprint for future deployments across the Mediterranean and other strategic maritime hubs.
 

The products and services herein described in this press release are not endorsed by The Maritime Executiv

Tuesday, July 14, 2026

 

Beyond isolated optimization: a holistic review across the pre‑mid post‑treatment chain for hard carbon in sodium‑ion battery





Shanghai Jiao Tong University Journal Center
Beyond Isolated Optimization: A Holistic Review Across the Pre‑Mid Post‑Treatment Chain for Hard Carbon in Sodium‑Ion Battery 

image: 

  • Proposes a holistic “Pre-Mid-Post” full-process engineering mode to go beyond fragmented single-point optimization of hard carbon anodes
  • Elucidates the synergistic and contradictory interplay among graphitic domains, nanopores, and defects in determining the Na⁺ storage properties
  • Future design necessitates cross-stage co-optimization and quantitative microstructure–performance relationships for rational HC engineering
view more 

Credit: Qingxuan Geng, Yonghui Zhang, Dongxu Xie, Chenhui Hao, Liping Guo, Jiwei Zhang*, Paul K. Chu*, Qingwei Li*.





As the global energy transition accelerates, sodium-ion batteries (SIBs) are emerging as a compelling alternative to lithium-ion systems, offering superior low-temperature performance, enhanced safety, and faster charging at a fraction of the cost. Yet, the commercialization bottleneck remains locked in the anode—specifically, hard carbon (HC), the only commercially viable anode material for SIBs today. Now, researchers from Qilu University of Technology, Henan University, City University of Hong Kong, and Wuhan University of Science and Technology, led by Professor Qingwei Li, Professor Jiwei Zhang, and Professor Paul K. Chu, have delivered a landmark review that redefines how we engineer HC from the ground up.

Why This Review Matters

Traditional HC research has long been trapped in a fragmented paradigm—optimizing precursors, pyrolysis, or post-treatment in isolation. These single-point improvements often yield disappointing results because they ignore the intricate synergies and trade-offs across the entire fabrication chain. This work shatters that paradigm by proposing a holistic "Pre-Mid-Post" full-process engineering framework, treating HC development as a systematically coordinated chain rather than a collection of disconnected steps.

Innovative Framework and Mechanism

The review first decodes the "house-of-cards" microstructure of HC—randomly oriented graphitic nanodomains, nanopores, and defects—and clarifies how these four core structural features collectively govern sodium storage. It then systematically dissects each stage of the fabrication chain:

Pretreatment Engineering: From hydrothermal crosslinking and chemical crosslinking to pre-oxidation, pre-carbonization, pre-doping, component regulation, and pore-forming treatments. Each strategy is evaluated for its capacity to modulate graphitic domain growth, pore topology evolution, and defect engineering at the precursor stage.

Mid-Pyrolysis Control: The review critically compares conventional slow heating carbonization with next-generation technologies including flash Joule heating (FJH) and microwave-induced heating. Notably, FJH enables millisecond-scale carbonization that suppresses excessive graphitization while preserving expanded interlayer spacing—yielding HC with plateau capacities up to 290 mAh g-1 and energy savings of ~80%.

Post-Treatment Modification: Surface functional group regulation, post-doping, pore filling, surface coating, and pre-sodiation are analyzed as precision "pruning" tools to refine the preformed carbon framework. For instance, fluorine grafting via "grafting technology" achieves ICE up to 90.0% and stable cycling over 5,000 cycles at 2.0 A g-1.

Outstanding Synergies and Trade-offs

The review's analytical depth lies in exposing the dynamic contradictions within HC microstructures: expanded interlayer spacing boosts ion transport but may compromise electronic conductivity; abundant closed pores enhance plateau capacity but require careful control of open-to-closed pore ratios; defects provide active sites yet exacerbate irreversible SEI formation. The authors demonstrate that only cross-stage co-optimization—where pretreatment preconditions mid-pyrolysis outcomes, which in turn dictate post-treatment efficacy—can resolve these antagonistic effects.

Industrial Relevance and Future Outlook

Drawing from commercial benchmarks including Kuraray, ShengQuan Group, and BSG New Energy, the review addresses the critical gap between laboratory innovation and industrial mass production. It emphasizes raw material consistency control, continuous rotary kiln/roller furnace engineering, and batch-to-batch stability as prerequisites for scaling.

Looking forward, the authors chart six strategic directions: (1) establishing multi-scale quantitative structure–performance relationships via advanced characterization and machine learning; (2) developing cross-stage synergistic modification strategies; (3) promoting interdisciplinary integration of computational simulation and in situ characterization; (4) resolving engineering bottlenecks in large-scale fabrication; (5) standardizing precursor physicochemical information disclosure; and (6) harnessing machine learning to accelerate R&D cycles.

Stay tuned for more groundbreaking insights from this collaborative team across Qilu University of Technology, Henan University, City University of Hong Kong, and Wuhan University of Science and Technology!