Adsorption kinetics and modeling of H 2 S by treated waste oil fly ash

01.Oct.2018

​Waste oil fly ash (OFA) collected from disposal of power generation plants was treated by physico-chemical activation technique to improve the surface properties of OFA. This synthesized material was further used for potential H2S adsorption from synthetic natural gas. The raw OFA was basically modified with the mixture of acids (20% HNO3 and 80% H3PO4) and it was further treated with 2M KOH to enhance the surface affinity as well as surface area of synthesized activated carbon. Correspondingly, it enhanced the adsorption of H2S. Crystallinity, surface morphology and pore volume distribution of prepared activated carbon were investigated with XRD, SEM and BET analysis. FTIR technique was also performed to check the functional groups during different synthesis stages of modified activated carbon. Langmuir, Freundlich, Sips and dual site Langmuir (DSL) models were used to study the kinetic and breakthrough behavior of H2S adsorption over alkali modified activated carbon. Modeling results of isotherms indicated that OFA has dual site with low and high affinity for H2S adsorption. Clark models, Thomas model and Yoon-Nelson model were used to examine the effect of flow rate and inlet concentration on the adsorption of H2S. Maximum uptake capacity of 8.5 mg/g was achieved at 100 ppm inlet concentration and flow rate of 0.2 L/min.

https://www.researchgate.net/publication/328328473_Adsorption_kinetics_and_modeling_of_H_2_S_by_treated_waste_oil_fly_ash​