Nitric oxide reduction by hydrogen peroxide absorption through a ceramic hollow fiber membrane contactor

Nitric oxide reduction by hydrogen peroxide absorption through a ceramic hollow fiber membrane contactor was studied experimentally. A membrane contactor with a single ceramic hollow fiber was characterized by multiple techniques, including contact angle measurement, gas permeation, water permeation and spectroscopy. The superhydrophobic ceramic was first used to achieve nonwetting conditions, and overatmospheric operating conditions were applied to enhance mass transfer. The effects of the process parameters on NO reduction were tested and discussed. It was found that NO reduction increases linearly with diffusion length. The gas flow rate and absorbent flow rate are suggested to be low to achieve high-efficiency gas absorption. NO reduction increases linearly with the enhancement factor or the square root of hydrogen peroxide concentration. Elevated pressure increases NO absorption flux and helps NO reduction within the breakthrough pressure.