Cyclic method of producing a hydrogen rich stream and/or a carbon monoxide rich stream

A cyclic method of producing a hydrogen rich stream and/or a carbon monoxide rich stream, said method comprises a first step and a second step, wherein;

• said first step comprises introducing a first gas stream to contact a first solid material, a first CO2 sorbent material and a second solid material to provide a first outlet stream comprising said hydrogen rich stream, said first gas stream comprising steam and at least one reductant, with the process conditions of said first step comprising a temperature ranging between 573 K and 1473 K and a pressure ranging between 0.1 and 100 bar and;
• said second step comprising introducing a second gas stream to contact said first solid material, said first CO2 sorbent material and said second solid material to provide a second outlet stream comprising said carbon monoxide rich stream, said second gas stream comprising at least one oxidant, with the process conditions of said second step comprising a temperature ranging between 573 K and 1473 K and a pressure ranging between 0.01 and 100 bar,
• wherein said first outlet stream and said second outlet stream are separated from each other,
• wherein said first solid material has a first thermodynamic equilibrium oxygen partial pressure p1O2,eq and said second solid material has a second thermodynamic equilibrium oxygen partial pressure p2O2,eq, with said first thermodynamic equilibrium oxygen partial pressure p1O2,eq being larger than said second thermodynamic equilibrium oxygen partial pressure p2O2,eq at the process conditions of said first step and at the process conditions of said second step,
• wherein said first solid material comprises a steam reforming catalyst,
• wherein said first solid material is in said first step and under the process conditions of said first step oxidising said at least one reductant to form syngas, said first solid material is in said first step and under the process conditions of said first step catalysing the reaction of said at least one reductant with said steam to form syngas and said first solid material is in said second step and under the process conditions of said second step oxidized by said at least one oxidant while not being oxidized by CO2,
• wherein said first CO2 sorbent material is capturing CO2 in said first step and under the process conditions of said first step and said first CO2 sorbent material is releasing CO2, in said second step and under the process conditions of the second step;
• and wherein said second solid material is in said first step and under the process conditions of the first step reduced by syngas and said second solid material is in said second step and under the process conditions of said second step oxidized by CO2 to form CO, by CO2 released by said first CO2 sorbent material in said second step.