And while passenger vehicles that run on natural gas may be an option for the financially well-off, Zhou says a more cost-efficient system will be necessary to drive a nationwide shift from petroleum to cleaner-burning fuels.
Zhou's goal is to solve the technical hurdles related to natural gas storage -- answers that bode well for sectors ranging from energy and economics to global relations and preservation.
"We should invest in this for security reasons so we don't have to rely on countries that may not be our allies for petroleum and for environmental reasons, since a large part of air pollution comes from the transportation sector," Zhou said. "Government policy can help. However, the ultimate determining factor is that it has to be commercially viable. If it's too expensive, few will use it."
Natural gas tanks for passenger vehicles currently are large and clunky, and no one wants to buy an ugly car, Zhou says. He says a key technical hurdle is making the natural gas, which is less dense than petroleum because it's in the gaseous state, fit in roughly the same space that a conventional petroleum gas tank occupies. With the help of a recent $3 million Department of Energy grant, Zhou and his team are collaborating with automobile giant General Motors (GM), Lawrence Berkeley National Laboratory (LBNL) and Research Triangle Institute (RTI) to figure out how to take such a fuel tank from concept to reality.
Creating the necessary infrastructure to store and pump natural gas into vehicles would be prohibitively costly, so Zhou believes the solution is to use the existing natural gas infrastructure that runs through the homes and garages of millions of Americans for household uses, such as heating, cooling and cooking. The problem is that natural gas from those lines comes out at such a low pressure that it needs to be compressed to get it to the pressure it needs to be stored at in the fuel tank, a costly process. The trick: build a fuel tank that can store low-pressure natural gas, which is precisely what Zhou is using his considerable expertise in inorganic chemistry to do.
Zhou and his Texas A&M research group are working to adapt porous material to store a larger amount of the gas in the fuel tank and then let it out when needed. The key is to find the right kind of adsorbent, a type of substance that attaches atoms, ions or molecules to its surface. Zhou specializes in porous polymer networks (PPN) and metal-organic frameworks (MOF), which are crystalline frameworks consisting of metal ions along with ions or molecules that bind to the metal ions called organic ligands. Pores inside the MOF can be used for gas storage.
"This is high-risk, high-reward research," Zhou said. "It's going to take some time to overcome some of the technical challenges."
Zhou earned his doctorate in chemistry from Texas A&M in 2000 under the guidance of legendary inorganic chemist Dr. F. Albert Cotton. He then spent two years as a postdoctoral fellow at Harvard University and was an associate professor at Miami University prior to joining the Texas A&M Department of Chemistry faculty in 2008. He has served since 2011 as chief scientific advisor for framergy™, a Texas-based startup company that oversees the commercialization of groundbreaking MOF innovations for industrial uses, ensuring that the broader benefits of Zhou's research are realized across the state, nation and world.
To learn more about Zhou and his research, go to http://www.chem.tamu.edu/faculty/zhou/. ###About 12 Impacts of the 12th Man: 12 Impacts of the 12th Man is an ongoing series throughout the year highlighting the significant contributions of Texas A&M University students, faculty, staff and former students on their community, state, nation and world. To learn more about the series and see additional impacts, visit http://12thman.tamu.edu/.About Research at Texas A&M University: As one of the world's leading research institutions, Texas A&M is in the vanguard in making significant contributions to the storehouse of knowledge, including that of science and technology. Research conducted at Texas A&M represents an annual investment of more than $700 million. That research creates new knowledge that provides basic, fundamental and applied contributions resulting in many cases in economic benefits to the state, nation and world. To learn more, visit http://vpr.tamu.edu.
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