Hydrogen Sulfide (H2S) Removal via MOFs.

Amvrosios G Georgiadis,Ioannis V Yentekakis,Nikolaos Charisiou,Maria A Goula

doi:10.3390/ma13163640

Amvrosios G Georgiadis, Ioannis V Yentekakis + Show 2 more

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https://doi.org/10.3390/ma13163640

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Abstract

The removal of the environmentally toxic and corrosive hydrogen sulfide (H2S) from gas streams with varying overall pressure and H2S concentration is a long-standing challenge faced by the oil and gas industries. The present work focuses on H2S capture using a relatively new type of material, namely metal-organic frameworks (MOFs), in an effort to shed light on their potential as adsorbents in the field of gas storage and separation. MOFs hold great promise as they make possible the design of structures from organic and inorganic units, but also as they have provided an answer to a long-term challenging objective, i.e., how to design extended structures of materials. Moreover, in designing MOFs, one may functionalize the organic units and thus, in essence, create pores with different functionalities, and also to expand the pores in order to increase pore openings. The work presented herein provides a detailed discussion, by thoroughly combining the existing literature on new developments in MOFs for H2S removal, and tries to provide insight into new areas for further research.

Highlights

Hydrogen sulfide (H2 S) is a colorless, corrosive, water-soluble, highly toxic, and flammable acid gas with the characteristic foul odor of rotten eggs, which can be typically found in natural gas, petroleum, and biogas [1,2,3,4]
Results of this study show that metal-organic frameworks (MOFs) based on metal clusters with open metal sites confine the employment of these solids for H2 S removal processes
We focus on the H2 S capture properties of the MOFs and the connection between the removal abilities and the structures

Summary

Introduction

Hydrogen sulfide (H2 S) is a colorless, corrosive, water-soluble, highly toxic, and flammable acid gas with the characteristic foul odor of rotten eggs, which can be typically found in natural gas, petroleum, and biogas (a byproduct of anaerobic decomposition) [1,2,3,4]. Its separation has significant economic and environmental repercussions for the relevant industries In this regard, different physicochemical methods have been developed and commercially adopted, such as biological treatment, chemical oxidation, chemical scrubbing, etc. For any adsorption application, it is desirable to design adsorbents with high selectivity towards the target molecules and high adsorption capacity [7,8]. Traditional adsorbents, such as natural and synthetic zeolites, have received considerable attention in recent years. Zeolites are microporous crystalline materials formed by a combination of SiO4 and AlO4 − or exclusively SiO4 tetrahedra sharing a vertex, and they have been widely used in the petrochemical industry as catalytic materials and adsorbents as well as water softeners in detergents [9]

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