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Newly appointed Houston METRO chair vows​ to bring clean, reliable public transit

Elizabeth Gonzalez Brock was named as board chair of the Metropolitan Transit Authority of Harris County. Photo via LinkedIn

Houston Mayor John Whitmire named the new board chair of the Metropolitan Transit Authority of Harris County.

An executive at Houston-based CenterPoint Energy, Elizabeth Gonzalez Brock was appointed to lead Houston METRO. The move, pending City Council and board approval, would make her the first Hispanic woman to chair the state's largest transit authority.

"I am grateful to Mayor Whitmire for the honor and opportunity to lead METRO as Board Chair and to be entrusted with this important responsibility, said Brock in a news release. “By appointing the first Hispanic woman in this role, the mayor confirms his commitment to identifying experienced, qualified, and diverse individuals to serve our city and his administration.

"I look forward to working collaboratively with the mayor, the METRO Board, and all levels of government to transform METRO into a best-in-class model of transit, accountability and transparency," she continues. "We will empower a strong management team that will drive measurable results and work directly with customers to understand their real needs to make public transit a safe, clean, and viable option for everyone.”

Brock is vice president of utility infrastructure planning and policy at CenterPoint Energy where she led large customer service, business, and economic development. Brock previously held positions at Reliant Energy, Texas Southern University, and the University of Houston in leadership roles. Brock graduated from the University of Houston with a bachelor's degree in political science.

She has been a member of the Board of Houston First Corporation since 2017 and was a founding member and chair of EV nonprofit Evolve Houston.

"Elizabeth is the leader we need for METRO today,” Whitmire said in a news release. “She brings a 'customer first' mindset, which is exactly the thinking our community deserves," Mayor Whitmire said. "Safety and reliability are key for all who depend on or commute alongside public transportation. I am confident that Elizabeth will use her results-driven expertise to drive METRO to deliver a user-friendly and fiscally responsible transit system to all. She understands that my priority is providing mobility options for all Houstonians."

The area has a 1,309-square-mile service area and an annual budget of $ 1.6 billion.

Recently, Whitmire announced Houston Airports Chief Operating Officer Jim Szczesniak replaced longtime Director Mario Diaz. Diaz was head of Houston Airports since 2010 and oversaw the George Bush Intercontinental Airport, William P. Hobby Airport and Ellington Airport, a military use airport. Szczesniak served as Houston Airport’ chief operating officer for the past two years. He previously led the multibillion-dollar capital improvement program.

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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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