Adsorption of Hydrogen Sulfide at Low Temperatures Using an Industrial Molecular Sieve: An Experimental and Theoretical Study

Abstract

In the work presented herein, a joint experimental and theoretical approach has been carried out to obtain an insight into the desulfurization performance of an industrial molecular sieve (IMS), resembling a zeolitic structure with a morphology of cubic crystallites and a high surface area of 590 m 2 g –1 , with a view to removing H 2 S from biogas. The impact of temperature, H 2 S inlet concentration, gas matrix, and regeneration cycles on the desulfurization performance of the IMS was thoroughly probed. The adsorption equilibrium, sorption kinetics, and thermodynamics were also examined. Experimental results showed that the relationship between H 2 S uptake and temperature increase was inversely proportional. Higher H 2 S initial concentrations led to lower breakpoints. The presence of CO 2 negatively affected the desulfurization performance. The IMS was fully regenerated after 15 adsorption/desorption cycles. Theoretical studies revealed that the Langmuir isotherm better described the sorption behavior, pore diffusion was the controlling step of the process (Bangham model), and that the activation energy was 42.7 kJ mol –1 (physisorption). Finally, the thermodynamic studies confirmed that physisorption predominated.

Cost‐Effective Adsorption of Oxidative Coupling‐Derived Ethylene Using a Molecular Sieve

“…Detailed information regarding the adsorbent used herein and its physicochemical properties has been previously provided in [18]. Briefly, the adsorbent is an alkali-metallic silicon-aluminum material that was purchased from Merck (product number: 1.05705.0250).…”

“…Detailed information regarding the structural characteristics of the adsorbent used herein can be found in [18], so only a brief summary of the main finding will be discussed herein. XRD studies showed a highly crystalline material with a structure -…”

“…where K F (mg 1-1/n F g -1 L 1/n F ) and n F are indicators of the adsorption capacity and adsorption intensity, respectively. The Temkin isotherm is described as [18]:…”

“…Recently, many works have focused on the development of different types of adsorbents (i.e., zeolites, activated carbons, metal oxides, and metal-organic frameworks) for the sequestration of C 2 H 4 [17]. However, zeolites can be used as effective adsorbents, offering high selectivity, adsorption capacity, and chemical and thermal stability [18]. Their higher performance is attributed to their structural properties, with their regular pores being capable of size-, shape-, and polarity-based separation.…”

Recent Progress in the Steam Reforming of Bio-Oil for Hydrogen Production: A Review of Operating Parameters, Catalytic Systems and Technological Innovations

“…Generally, a variety of physicochemical methods have been applied for the removal of the H 2 S generated from industrial processes such as petroleum refining, natural gases, biogas processing and coal gasification [170][171][172]. Compared to naphtha which contains about 1.5% sulfur, bio-oil derived from the fast pyrolysis of biomass has a sulfur content in the range of 0.01-0.2% [142].…”