scholarly journals Hydrogen Sulfide (H2S) Removal via MOFs

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3640 ◽  
Author(s):  
Amvrosios G. Georgiadis ◽  
Nikolaos Charisiou ◽  
Ioannis V. Yentekakis ◽  
Maria A. Goula

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.

2020 ◽  
Vol 2 (1) ◽  
pp. 27
Author(s):  
Amvrosios G. Georgiadis ◽  
Nikolaos D. Charisiou ◽  
Ioannis V. Yentekakis ◽  
Maria A. Goula

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.


Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 916 ◽  
Author(s):  
Georges Chedid ◽  
Ali Yassin

Materials science has seen a great deal of advancement and development. The discovery of new types of materials sparked the study of their properties followed by applications ranging from separation, catalysis, optoelectronics, sensing, drug delivery and biomedicine, and many other uses in different fields of science. Metal organic frameworks (MOFs) and covalent organic frameworks (COFs) are a relatively new type of materials with high surface areas and permanent porosity that show great promise for such applications. The current study aims at presenting the recent work achieved in COFs and MOFs for biomedical applications, and to examine some challenges and future directions which the field may take. The paper herein surveys their synthesis, and their use as Drug Delivery Systems (DDS), in non-drug delivery therapeutics and for biosensing and diagnostics.


Author(s):  
Margareta Maria Sintorini

<p><strong>Aims:</strong> This study is aimed to identify the hazards and occupational risk factors of Hydrogen sulfide as one of the most dangerous gas exposures for employees coming from coal, oil and gas companies. Hydrogen sulfide is a toxic colourless gas with a characteristic odor, soluble in various liquids including water. This gas is irritant and asphyrant that can be absorbed through lung into blood. Its inhalation exerts hard damage of respiratory tract. <strong>Methodology and Result</strong>: The method used is the analysis of questionnaires with logistic regression statistics. The numbers of respondents are 170 people from the employment population who work in coal mining and Pertamina production units. Results obtained from workers' observations and H2S sampling suggest that the most dominant source of H<sub>2</sub>S exposure hazard comes from the skim tank and DAF areas. The variables associated with shortness of breath was age (P = 0.006). As many as 17.3% of workers did not apply proper work procedures, and 30.58% of workers had experienced work accidents.<strong> Conclusion, significance and impact study: </strong>H<sub>2</sub>S are not related to complaints of dizziness or shortness of breath of workers. Specific factors related to occupational safety are long-term exposure of work factors related to complaints of shortness of breath (OR = 2,061), and factors not using PPE associated with dizziness (OR = 3,484)</p>


2021 ◽  
Vol 937 (4) ◽  
pp. 042085
Author(s):  
N Mukhutdinov ◽  
I Khalismatov ◽  
N Akramova ◽  
R Zakirov ◽  
A Zakirov ◽  
...  

Abstract The results of long-term studies of natural gases in the Bukhara-Khiva oil and gas region of Uzbekistan are summarized. The results of studying the composition of gases in hydrocarbon deposits generated by OM of continental (terrigenous deposits of the Cretaceous and Middle Jurassic) and marine (carbonate Jurassic) facies are presented. Regularities of changes in individual constituents of gases (hydrocarbons, hydrogen sulfide, carbon dioxide, nitrogen, etc.) with depth are considered; the influence exerted on the composition of gases by various factors and, above all, those of them, which, in the opinion of most researchers, are the main ones. The revealed patterns are used for predictive assessment of the distribution of various constituents of natural gases in the study area.


Author(s):  
Peng Zhang ◽  
Nan Song ◽  
Songbin Liu ◽  
Qiqing Li ◽  
Yu Wang ◽  
...  

A new type of ligand-induced lanthanide metal–organic framework nanosphere is reported, which yields tunable emission colors by adding or removing water ligands, showing great promise in MOF sensors and anti-counterfeiting.


Author(s):  
Peihao Zhang ◽  
Jiawang Chen ◽  
Zhenwei Tian ◽  
ZiQiang Ren ◽  
Yongqiang Ge ◽  
...  

Abstract With the increasing scale of the exploitation of ocean oil and gas resources, the decomposition of natural gas hydrate and the exploitation of submarine oil will damage the engineering mechanical structure of submarine sediments, leading to submarine collapse, landslide, even earthquake and other geological disasters, seriously threatening the exploration and exploitation of Marine resources. Therefore, it is necessary to develop a deep-seabed drilling robot to carry out real-time long-term monitoring of changes in the seabed environment by carrying sensors and detection devices. This paper will describe the design structure of the drilling robot, and explain the working process through that the drilling robot is released from the sea bed into the stratum of the mining area, and can achieve autonomous drilling and steering functions in the seabed stratum. In this paper, theoretical analysis and simulation verification will prove the feasibility of the robot moving in the stratum.


2021 ◽  
Author(s):  
Jasenka Bubić ◽  
Luka Bašić

Oil drives the entire world economy, and it is entirely a geostrategy issue. The strong development of the economy over the past few decades has provided a global stage for those countries that have a stable political establishment while managing enormous amounts of oil. Now, year after year, it is becoming increasingly clear that the importance of oil and gas is falling away, and it is those energy sources that bring about a reduction in the half-life that comes into the scene. Oil and gas are non-renewable energy sources and as such are naturally limited, therefore their reserve will become economically unprofitable in the future, and exploitation will reach its natural end. The aim of this research paper is divided into two structures: the first thesis concerns giving a fresh insight into the state of the oil market from the beginning of the pandemic to the present day. The issue of geopolitical relations between Riyadh and Moscow is to be addressed here and how much of a negative consequence the price war has left on their fiscal calculations, although geopolitical friction has deepened the shock further into financial markets. Thus, the fiscal calculation of both countries suffered revenue shocks, but it also prompted an even deeper decline in stock indexes and temporary stagflation of the global economy. The second thesis refers to a brief review of the analysis of the long-term future of non-renewable and renewable energy sources. The future of cleaner forms of energy is imperative, but also a challenging task, as this means shifting the entire structure of national economies to green and renewable. The focus is on giving insight into why this is a necessity, but also why there could be a dangerous precedent and negative cash flows in some structures of the economy. Currently, and any future planning and fulfillment of climate guidelines, must not lead to an increase in energy poverty and consequently a decrease in living standards, because in all geopolitical games the line is always drawn between rich and poor countries, that is, advanced economies and developing economies. Therefore, the long-term and global leaders in green and renewable energy sources will be those countries that successfully implement public interests in these projects, because only in this way can the goal be met – shifting a certain structure of the economy to cleaner sources while satisfying social utility and increasing employment.


BMC Biology ◽  
2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Mor Taub ◽  
Yossi Yovel

Abstract Background Learning to adapt to changes in the environment is highly beneficial. This is especially true for echolocating bats that forage in diverse environments, moving between open spaces to highly complex ones. Bats are known for their ability to rapidly adjust their sensing according to auditory information gathered from the environment within milliseconds but can they also benefit from longer adaptive processes? In this study, we examined adult bats’ ability to slowly adapt their sensing strategy to a new type of environment they have never experienced for such long durations, and to then maintain this learned echolocation strategy over time. Results We show that over a period of weeks, Pipistrellus kuhlii bats gradually adapt their pre-takeoff echolocation sequence when moved to a constantly cluttered environment. After adopting this improved strategy, the bats retained an ability to instantaneously use it when placed back in a similarly cluttered environment, even after spending many months in a significantly less cluttered environment. Conclusions We demonstrate long-term adaptive flexibility in sensory acquisition in adult animals. Our study also gives further insight into the importance of sensory planning in the initiation of a precise sensorimotor behavior such as approaching for landing.


1997 ◽  
Vol 17 (03) ◽  
pp. 161-162
Author(s):  
Thomas Hyers

SummaryProblems with unfractionated heparin as an antithrombotic have led to the development of new therapeutic agents. Of these, low molecular weight heparin shows great promise and has led to out-patient therapy of DVT/PE in selected patients. Oral anticoagulants remain the choice for long-term therapy. More cost-effective ways to give oral anticoagulants are needed.


2015 ◽  
Vol 12 (1) ◽  
pp. 1-12
Author(s):  
Sarah Hackett

Drawing upon a collection of oral history interviews, this paper offers an insight into entrepreneurial and residential patterns and behaviour amongst Turkish Muslims in the German city of Bremen. The academic literature has traditionally argued that Turkish migrants in Germany have been pushed into self-employment, low-quality housing and segregated neighbourhoods as a result of discrimination, and poor employment and housing opportunities. Yet the interviews reveal the extent to which Bremen’s Turkish Muslims’ performances and experiences have overwhelmingly been the consequences of personal choices and ambitions. For many of the city’s Turkish Muslim entrepreneurs, self-employment had been a long-term objective, and they have succeeded in establishing and running their businesses in the manner they choose with regards to location and clientele, for example. Similarly, interviewees stressed the way in which they were able to shape their housing experiences by opting which districts of the city to live in and by purchasing property. On the whole, they perceive their entrepreneurial and residential practices as both consequences and mediums of success, integration and a loyalty to the city of Bremen. The findings are contextualised within the wider debate regarding the long-term legacy of Germany’s post-war guest-worker system and its position as a “country of immigration”.


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