A Novel Method Of Specific Adsorption Of Hazardous Hydrogen Sulfide Gas in Gas Processes By Core-Shell Hybrid Nano Adsorbent MIL-101(Cr)@MIPs@H2S

Abstract

Abstract Hydrogen sulfide gas is a challenge in the oil and gas industry due to its toxicity and corrosive nature. In addition to the toxicity of H2S, it is very corrosive both in gas and when dissolved. It is oxidized when oxidized in the combustion process, and the form of SO2 causes acid rain. Adsorption using MIL-101(Cr) @NIPs/MIPs@H2S adsorbents offers a promising solution with high efficiency, low cost, and low energy consumption. This study optimized the operating parameters for efficient and cost-effective adsorption of H2S gas. Thirty experiments were conducted to analyze the impact of the operating parameters of the adsorbent (0.1 to 1 g), temperature (25 to 80°C), concentration (10 to 1000 ppm), and flow rate (40 to 100 mL/min) on the process. The evaluation was carried out to determine cause-and-effect relationships between the variables above. The molar adsorption capacity of gases in a 400 mm high, 10 mm internal diameter fixed bed was determined using the central composite design method and the Soave-Redlich-Kwong equation. FTIR, XRD, FE-SEM, and BET techniques were then used to determine the physical properties. The statistical analysis of variance results indicated that the adsorbents adhere to the quadratic model, with temperature and adsorbent dose being the primary process variables. The optimum adsorption efficiency and capacity for MIL-101(Cr)@MIPs@H2S (11 mg/g = 94.3%) is higher than that of MIL-101(Cr)@NIPs@H2S (5.97 mg/g = 9.9%) and due to a better match between the template and binding sites in the template layer, which facilitates efficient template uptake and removal. The equilibrium adsorption of all Nano-adsorbents followed the pseudo-Scott order and Langmuir isotherm models. MIL-101(Cr) @MIPs@H2S proved to be a reliable and stable adsorbent for hydrogen sulfide. Its specific adsorption selectivity for H2S resulted in a significantly higher adsorption capacity than other gases in mixed CO2 and CH4.