A systematic study of the iron hydroxide-based adsorbent for removal of hydrogen sulphide from biogas

Abstract

This study was aimed to evaluate the hydrogen sulfide (H2S) removal efficiency of an economic iron hydroxide-based adsorbent from simulated biogas mixture with an H2S concentration range of 500–10300 ppm. The properties of these porous materials such as crystal structures, surface patterns, surface area, pore volume and pore size were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and BET measurements. The H2S adsorption capacity (Adscap) is nearly independent of the drying temperature of hydroxide-based adsorbent over the range of temperatures tested (100–200 °C) as well as relative humidity (0–80%) under equal conditions of H2S concentration. In addition, the experimental results revealed that the Adscap increased exponentially from 23.3 to 48.7 wt% with the increased retention time from to 0.5–52.9 s and decreasing space velocity from 7433 to 68 h-1. At the same time, Adscap increased linearly from 20.57 to 35.18 wt% with the increasing H2S concentration from 500 to 10300 ppm.