Coal to graphite via microwave heating

Source: Researchers turn coal powder into graphite in microwave oven

"By cutting the copper foil into a fork shape, the sparks were induced by the microwave radiation, generating an extremely high temperature of more than 1,800 degrees Fahrenheit within a few seconds," says Masi, lead author of the paper. "This is why you shouldn't place a metal fork inside a microwave oven."

The sparks caused by the microwaves generated the high temperatures necessary to transform the coal powder into polycrystalline graphite, with the copper foil and hydrogen gas also contributing to the process.

While the experiment included microwave durations ranging from 3 to 45 minutes, the optimal duration was found to be 15 minutes.

The researchers say this new method of coal conversion could be refined and performed at a larger scale to yield both a higher quality and quantity of nano-graphite materials.

"Finite graphite reserves and environmental concerns for the graphite extraction procedures make this method of converting coal to graphite a great alternative source of graphite production," the scientists wrote.​

This is important as graphite is an important resource in LiON batteries.

Bob Wilson