Hydrocsrbon chains are the most efficient way to store carbo
Volumetric efficiency is not the relevant metric. Energy efficiency is much more important. The process you describe requires far greater energy input to complete the sequestration.
Furthermore, the physical properties are a problem. Biomass appropriate to this process is conveyed as a flammable, pelletized solid; CO2 is an inert fluid. One of these can be pumped via pipeline into empty subterranean reservoirs; the other cannot.
Volumetric efficiency is not the relevant metric. Energy efficiency is much more important. The process you describe requires far greater energy input to complete the sequestration.
Furthermore, the physical properties are a problem. Biomass appropriate to this process is conveyed as a flammable, pelletized solid; CO2 is an inert fluid. One of these can be pumped via pipeline into empty subterranean reservoirs; the other cannot.