Abstract
NOx (NO and NO2) are air toxins that endanger life and represent a hazard to the environment, such as photochemical smog, global warming, acid rain, ozone depletion, and the occurrence of respiratory infections. Some technological strategies to diminish NOx emissions to meet regulations depend on two techniques: the dry process and the wet process. This study applies polyvinylidene fluoride (PVDF) hollow fiber membrane modules as a medium to remove NOx from solutions containing several absorbents such as hydrogen peroxide and nitric acid (H2O2-HNO3) solutions, sodium chlorite and sodium hydroxide (NaClO2-NaOH) solutions, and sodium chlorate and sodium hydroxide (NaClO3-NaOH) solutions. The experimental results showed that the oxidant’s strength influences NOx removal efficiency, where the absorbent solutions containing hydrogen peroxide had the highest removal efficiency as hydrogen peroxide is the most potent oxidant, followed by sodium chlorite and sodium chlorate. The three pairs of absorbents also gave a high NOx removal efficiency (above 90%), which means that all the absorbents used in the study are very potential to be used to diminish NOx via the wet process. NOx removal efficiency at the same feed gas flow rate increased as the number of fiber and absorbent concentrations is increased. However, NOx removal efficiency is reduced as the feed gas flow rate is increased at the same membrane module and absorbent concentration.
Highlights
Nitrogen oxides, which are called NOx (NO and NO2), are generally released from petroleum derivatives, especially in their utilization in power generation and industrial manufacture, hazard life, and threaten the environment [1,2,3,4,5]
NOx storage and reduction (NSR) is the most popular lean-NOx reduction technology and the catalysis technology of choice, which is recognized as lean-NOx trap (LNT) or NAC (NOx absorber catalysts) [21]
The hollow fiber membrane module is expected to provide a large contact area between gas and absorbent to enhance the reaction between NOx and absorbent, which leads to an increase in the NOx removal process
Summary
Effect of Absorbents on NOx Removal through Polyvinylidene Fluoride (PVDF) Hollow Fiber Membrane Modules. Some technological strategies to diminish NOx emissions to meet regulations depend on two techniques: the dry process and the wet process. Is study applies polyvinylidene fluoride (PVDF) hollow fiber membrane modules as a medium to remove NOx from solutions containing several absorbents such as hydrogen peroxide and nitric acid (H2O2-HNO3) solutions, sodium chlorite and sodium hydroxide (NaClO2NaOH) solutions, and sodium chlorate and sodium hydroxide (NaClO3-NaOH) solutions. NOx removal efficiency at the same feed gas flow rate increased as the number of fiber and absorbent concentrations is increased. NOx removal efficiency is reduced as the feed gas flow rate is increased at the same membrane module and absorbent concentration
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