But is there any commercial applications??

The mixture of methane and propane mixture is passed over a tantalum hydride catalyst at 250 °C, It is possible to convert propane into two moles of ethane molecules by incorporation of one mole of methane.

In a non-thermal plasma reactor, methane gas is converted to ethane, propane and butane(s) in a gas phase, near atmospheric pressure. The ethane product from the first reactor is separated and is converted to propane in the second reactor in the presence of methane. Propane is separated from the product stream as a liquid, via simple compression, and blended with measured amounts of butane and an odorant, as required. Unreacted methane and excess hydrogen gas are separated and recycled.

https://www.alkcon.com/alkcon-process/