Sapphire may help make coal a cleaner fuel source

Washington, Mar 28 (ANI): Researchers at Missouri University of Science and Technology believe sapphire, a brilliant blue gemstone, may soon play an important part in making coal a cleaner fuel source.

The boffins are investigating sapphire's suitability for sensors that could survive the harsh, hot environment of coal-gasification plants, which produces synthesis gas (syngas), a synthetic form of natural gas that can be used as a clean fuel for power generation and transportation.

Sapphire is also a tough mineral and, when grown as single crystal sapphire, is able to withstand extreme temperatures. That's why the Missouri S and T researchers think it could handle the heat of coal gasification.

"It's a very harsh environment," Dr. Hai Xiao, associate professor of electrical and computer engineering at Missouri S and T, says of the systems that turn coal into syngas. Those harsh environments also require precise temperature and pressure controls to make syngas as cleanly as possible.

"The high temperature ensures the efficient transformation of coal to syngas, creating less waste and sustaining a better environment." Xiao says.

One of the roadblocks to the coal gasification technology is the lack of process control instrumentation that can handle the harsh gasification environment. "There's a huge technology gap for sensing and monitoring in harsh environments in general," Xiao says. For instance, future spacecraft with power systems that run hot also need tough control systems, Xiao says.

Xiao and his colleagues believe sapphire can take the heat. But they still have to figure out how to turn the crystal into a very small sensor. The researchers want to create sensors that are only about 100 microns in diameter - about the thickness of a human hair. The sensors will take the form of fibers. (ANI)