A geothermally powered petrochemical refining system includes a geothermal system with a wellbore extending from a surface into an underground magma reservoir. A geothermally powered fractional distillation system receives crude oil and produces distillates which are separated by molecular weight. The distillates may be provided to a geothermally powered cracking system that is heated by a heat transfer fluid heated by the geothermal system to crack heavy hydrocarbons into lighter ones. The distillates may be provided to a geothermally powered reforming system that is heated by a heat transfer fluid heated by the geothermal system to reform hydrocarbons into different structures.

A heat transfer media comprises a particle. The particle comprises a discontinuous phase and a matrix material. The discontinuous phase is disposed within the matrix material, and the matrix material has a higher melting point than the discontinuous phase. The discontinuous phase has a melting point selected to be within a reaction temperature range.