better busses

City of Houston, METRO reveal autonomous shuttle,  zero-emission initiatives

FutureLink is part of the second phase of METRO's autonomous vehicle testing program. Photo courtesy of METRO

Houston and METRO took the latest step towards transforming the city into a leader in innovative and eco-friendly transportation.

Mayor Sylvester Turner unveiled METRO's new autonomous shuttle, FutureLink. The vehicle a fully autonomous zero-emission shuttle that can operate on city streets between Texas Southern University and METRO's Eastwood Transit Center. The level 4 zero-emission shuttle bus can seat 14 passengers and up to two wheelchairs.

FutureLink is part of the second phase of METRO's autonomous vehicle testing program.

"FutureLink represents the intersection of innovation and sustainability," says Mayor Turner in a news release. "METRO continues to pioneer change and today, we celebrate METRO's commitment to advancing our city's vision for the future in which transportation is safe, equitable, and resilient."

METRO's electric bus was also on display at the event, which is part of its fleet of zero-emission vehicles that align with the city's Climate Action Plan working towards a greener future.

"At METRO, we believe that innovation and sustainability are not just responsibilities, but opportunities to create a better tomorrow," METRO Board Chair Sanjay Ramabhadran says in a news release. "We are passionate about building a thriving, livable, and equitable future for the Houston region, and we are working hard to make it a reality for generations to come."

The project was funded by the Federal Transit Administration through its Accelerating Innovative Mobility program. Phase 2 of the pilot program is expected to run through October 2024, with a final report aiming for March 2025.

Earlier this month, the city approved funding for an EV rideshare service. The $281,000 of funding went toward the expansion of free electric vehicle rideshare services in communities that are considered underserved by utilizing services like RYDE and Evolve Houston.

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A View From HETI

A team from UH has published two breakthrough studies that could help cut costs and boost efficiency in carbon capture. Photo courtesy UH.

A team of researchers at the University of Houston has made two breakthroughs in addressing climate change and potentially reducing the cost of capturing harmful emissions from power plants.

Led by Professor Mim Rahimi at UH’s Cullen College of Engineering, the team released two significant publications that made significant strides relating to carbon capture processes. The first, published in Nature Communications, introduced a membraneless electrochemical process that cuts energy requirements and costs for amine-based carbon dioxide capture during the acid gas sweetening process. Another, featured on the cover of ES&T Engineering, demonstrated a vanadium redox flow system capable of both capturing carbon and storing renewable energy.

“These publications reflect our group’s commitment to fundamental electrochemical innovation and real-world applicability,” Rahimi said in a news release. “From membraneless systems to scalable flow systems, we’re charting pathways to decarbonize hard-to-abate sectors and support the transition to a low-carbon economy.”

According to the researchers, the “A Membraneless Electrochemically Mediated Amine Regeneration for Carbon Capture” research paper marked the beginning of the team’s first focus. The research examined the replacement of costly ion-exchange membranes with gas diffusion electrodes. They found that the membranes were the most expensive part of the system, and they were also a major cause of performance issues and high maintenance costs.

The researchers achieved more than 90 percent CO2 removal (nearly 50 percent more than traditional approaches) by engineering the gas diffusion electrodes. According to PhD student and co-author of the paper Ahmad Hassan, the capture costs approximately $70 per metric ton of CO2, which is competitive with other innovative scrubbing techniques.

“By removing the membrane and the associated hardware, we’ve streamlined the EMAR workflow and dramatically cut energy use,” Hassan said in the news release. “This opens the door to retrofitting existing industrial exhaust systems with a compact, low-cost carbon capture module.”

The second breakthrough, published by PhD student Mohsen Afshari, displayed a reversible flow battery architecture that absorbs CO2 during charging and releases it upon discharge. The results suggested that the technology could potentially provide carbon removal and grid balancing when used with intermittent renewables, such as solar or wind power.

“Integrating carbon capture directly into a redox flow battery lets us tackle two challenges in one device,” Afshari said in the release. “Our front-cover feature highlights its potential to smooth out renewable generation while sequestering CO2.”

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