Abstract

The removal of hydrogen sulfide (H2S) from gas streams with varying overall pressure and H2S concentrations is a long-standing challenge faced by the oil and gas industries. The present work focuses on H2S capture using 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, they have provided an answer to a long-time challenging issue, i.e., how to design extended structures of materials. Moreover, the functionalization of the MOF’s surface can result in increased H2S uptake. For example, the insertion of 1% of a fluorinated linker in MIL-101(Cr)-4F(1%) allows for enhanced H2S capture. Although noticeable efforts have been made in studying the adsorption capacity of H2S using MOFs, there is a clear need for gaining a deeper understanding in terms of their thermal conductivities and specific heats in order to design more stable adsorption beds, experiencing high exothermicity. Simply put, the exothermic nature of adsorption means that sharp rises in temperature can negatively affect the bed stability in the absence of sufficient heat transfer. 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

  • The removal of hydrogen sulfide (H2S), released from different industrial sources is a matter of great importance as it can cause corrosion and environmental damage even at low concentrations

  • H2S removal using Metal Organic Frameworks (MOFs) can be limited by the formation of strong and often irreversible bonds

  • The need to elucidate further the preferred H2S adsorption sites arises to optimize this kind of H2S separations

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Summary

Introduction

The removal of hydrogen sulfide (H2S), released from different industrial sources is a matter of great importance as it can cause corrosion and environmental damage even at low concentrations. H2S capture using MIL-53(Al), in both powder and pellet form, was examined by Heymans et al [5] who carried out a joint experimental/theoretical approach Their focus was on synchronous removal of H2S and CO2 from biogas streams. One can conclude tat the triangular pores of this MOF were locked by some remaining organic or solvent molecules because of the incomplete activation of the material This partially activated sorbent was proven to be fully regenerable for at least five consecutive sulfidation cycles. The authors aimed to investigate the adsorption performance of MIL−101(Cr)- 4F(1%) at low temperature (30 °C) and 15% of H2S volume Results showed that this MOF outperformed other mesoporous MOFs mentioned in the literature. It was mentioned that the insertion of glucose can help maintain structural stability and prevent distortion

H2S Capture via M-MOF-74
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