$(2$pts$)$ Suppose you fill the columns with a porous material that adsorbs CO$2$ selectively over N$2.$ You want to make the cycle times longer. Would you increase or decrease the following factors? $1)$ Velocity at which the gas mixture is fed to the columns, $2)$ Diffusion rate of $CO2$ into the porous pellets, $3)$ Selectivity of the material for $CO2,4$ adsorption capacity of the material, $5)$ Pressure for capture, $6)$ Temperature for capture, $7)$ Pressure for blowdown, $8)$ Temperature for blowdown.