There are three different technologies for natural gas methane production from coal - (1)the two-steps method, (2) the hydrogenation, and (3) the catalytic coal gasification,
1st and the 3rd method has been used commercially in China and many other countries and the second method is still under development
(1) The first step is to convert coal to synthesis gas (CO+H2) and the second step is to use CO2 and hydrogen for the natural gas synthesis.
(2) For the hydrogenation, coal is directly gasified with hydrogen to produce natural gas.
(3) For the catalytic coal gasification, the catalyst is used to accelerate the gasification reaction rate and in-situ methane synthesis
(https://www.sciencedirect.com/science/article/pii/S258891332100020X#b0030)
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