seeing green

HISD receives millions in funding from EPA for clean school buses

All aboard the bus to greener transportation. Photo via Unsplash

Houston Independent School District is hopping on the city's net-zero carbon emissions bus, so to speak, thanks to more than $6.2 million in funding that came from the Environmental Protection Agency last year.

The funds are part of the EPA's Clean School Bus Program Fiscal Year 2022 rebate competition, which will award nearly $51 million in funds from President Biden’s Bipartisan Infrastructure Law to Texas school districts, and $965 million in total to districts around the country.

Houston's $6.2 million will go toward 25 new school buses, according to a statement from the EPA. Fifteen of the vehicles will be brand-new electric buses.

"Taking steps to make our school buses greener while remaining safe and effective is not only imperative for the wellbeing of students and bus drivers, but also for the public at large,” Houston Congressman Al Green said in a statement. “I applaud this announcement by the EPA under President Biden’s leadership. I look forward to seeing the positive impact that this outstanding award to purchase electric and propane school buses will have on reducing our carbon footprint.”

HISD's next step was to submit Payment Request Forms with purchase orders that shows the district has ordered the new buses and eligible infrastructure.

The district is among 13 Texas school districts to receive funding. Dallas ISD, the second largest school district in the state behind HISD, was awarded roughly $7.6 million. Killeen ISD and Socorro ISD received the largest sums among the districts, totalling nearly $9.9 million in funding each.

At the time of the statement from October, the EPA had selected 389 applications across the country totaling $913 million to support the purchase of 2,463 buses, mainly in areas serving low-income, rural, and/or Tribal students. More applications are under review, and the EPA plans to announce additional districts that will receive funding, bringing the total investment to the full $965 million, in the coming weeks, according to a statement.

The EPA intends to make available another $1 billion for clean school buses in Fiscal Year 2023.

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This article originally ran on InnovationMap.

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A View From HETI

Ahmad Elgazzar, Haotian Wang and Shaoyun Hao were members of a Rice University team that recently published findings on how acid bubbling can improve CO2 reduction systems. Photo courtesy Rice.

In a new study published in the journal Science, a team of Rice University researchers shared findings on how acid bubbles can improve the stability of electrochemical devices that convert carbon dioxide into useful fuels and chemicals.

The team led by Rice associate professor Hoatian Wang addressed an issue in the performance and stability of CO2 reduction systems. The gas flow channels in the systems often clog due to salt buildup, reducing efficiency and causing the devices to fail prematurely after about 80 hours of operation.

“Salt precipitation blocks CO2 transport and floods the gas diffusion electrode, which leads to performance failure,” Wang said in a news release. “This typically happens within a few hundred hours, which is far from commercial viability.”

By using an acid-humidified CO2 technique, the team was able to extend the operational life of a CO2 reduction system more than 50-fold, demonstrating more than 4,500 hours of stable operation in a scaled-up reactor.

The Rice team made a simple swap with a significant impact. Instead of using water to humidify the CO2 gas input into the reactor, the team bubbled the gas through an acid solution such as hydrochloric, formic or acetic acid. This process made more soluble salt formations that did not crystallize or block the channels.

The process has major implications for an emerging green technology known as electrochemical CO2 reduction, or CO2RR, that transforms climate-warming CO2 into products like carbon monoxide, ethylene, or alcohols. The products can be further refined into fuels or feedstocks.

“Using the traditional method of water-humidified CO2 could lead to salt formation in the cathode gas flow channels,” Shaoyun Hao, postdoctoral research associate in chemical and biomolecular engineering at Rice and co-first author, explained in the news release. “We hypothesized — and confirmed — that acid vapor could dissolve the salt and convert the low solubility KHCO3 into salt with higher solubility, thus shifting the solubility balance just enough to avoid clogging without affecting catalyst performance.”

The Rice team believes the work can lead to more scalable CO2 electrolyzers, which is vital if the technology is to be deployed at industrial scales as part of carbon capture and utilization strategies. Since the approach itself is relatively simple, it could lead to a more cost-effective and efficient solution. It also worked well with multiple catalyst types, including zinc oxide, copper oxide and bismuth oxide, which are allo used to target different CO2RR products.

“Our method addresses a long-standing obstacle with a low-cost, easily implementable solution,” Ahmad Elgazzar, co-first author and graduate student in chemical and biomolecular engineering at Rice, added in the release. “It’s a step toward making carbon utilization technologies more commercially viable and more sustainable.”

A team led by Wang and in collaboration with researchers from the University of Houston also shared findings on salt precipitation buildup and CO2RR in a recent edition of the journal Nature Energy. Read more here.

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