really lost need some kind of explanation along with answer

2. Carbon dioxide (CO2) from waste sources is a sustainable feedstock for chemicals production if new technologies can be developed to carry out the reduction of CO2, the most oxidized form of carbon, to a more reactive molecule. Recently, solar-energy-driven reactor concepts have emerged that harness the sun's energy to sustainably drive the thermocatalytic reduction of CO2 to reactive CO over a Ceria catalyst at high temperatures. A highly simplified version of this concept is provided in the figure below, which is operated at 700C and 1.5 bar. The diameter of the cylindrical reactor is 1.5m, the thickness of the porous catalyst lining the base of the reactor is 0.25cm, and the gas space above the porous catalyst layer can be considered well mixed. Pure CO2 is fed into the reactor and diffuses into the porous catalyst layer, which drives the reaction CO2(g)CO(g)+1/2O2(g), which is approximated as first order with a rate constant of 1.2s1 at 700C. The effective diffusion coefficient of CO2 in the gas mixture within the porous catalyst is 8.2102cm2/s at 1.5 bar and 700 C. It is desired to achieve 5.0 mole\% CO in the exiting outlet gas. What is the molar flow rate exiting the reactor (n2), in units of mol/min ? Hint: Even though the reactions occur on surfaces (heterogeneous), they should be treated as if they are occurring within the porous volume with an effective rate constant as if the reaction is homogeneous with the first order rate specified