Oxidized Single-Walled Carbon Nanotubes (SWCNs-COOH) as a New Catalyst for the Protection of Carbonyl Groups as Hydrazones

Nano-materials are considered as suitable heterogeneous catalysts for many organic reactions. Herein oxidized carbon nanotube (SWCNTs-COOH) has been reported as a heterogeneous catalyst, for protection of carbonyl groups as hydrazones in EtOH at 80 °C. The reactions proceed smoothly with good to excellent yields, and the SWCNTs-COOH used can be recycled.KEYWORDS Carbon nanotubes, protection, catalyst, carbonyl group

Triazine containing N-rich microporous organic polymers for CO2 capture and unprecedented CO2/N2 selectivity

Targeted synthesis of microporous adsorbents for CO2 capture and storage is very challenging in the context of remediation from green house gases. Herein we report two novel N-rich microporous networks SB-TRZ-CRZ and SB-TRZ-TPA by extensive incorporation of triazine containing tripodal moiety in the porous polymer framework. These materials showed excellent CO2 storage capacities: SB-TRZ-CRZ displayed the CO2 uptake capacity of 25.5 wt% upto 1 bar at 273 K and SB-TRZ-TPA gave that of 16 wt% under identical conditions. The substantial dipole quadruple interaction between network (polar triazine) and CO2 boosts the selectivity for CO2/N2. SB-TRZ-CRZ has this CO2/N2 selectivity ratio of 377, whereas for SB-TRZ-TPA it was 97. Compared to other porous polymers, these materials are very cost effective, scalable and very promising material for clean energy application and environmental issues

A microporous six-fold interpenetrated hydrogen-bonded organic framework for highly selective separation of C 2

A unique six-fold interpenetrated hydrogen-bonded organic framework (HOF) has been developed, for the first time, for highly selective separation of C2H4/C2H6 at room temperature and normal pressure

Data for: Experimental data, thermodynamic and neural network modeling of CO2 absorption capacity for 2-amino-2-methyl-1-propanol (AMP) + Methanol (MeOH) + H2O system

Experimental and calculated CO2 loadings in aqueous AMP + MeOH solution at different temperature and partial pressure

Data for: Experimental data, thermodynamic and neural network modeling of CO2 absorption capacity for 2-amino-2-methyl-1-propanol (AMP) + Methanol (MeOH) + H2O system

Experimental and calculated CO2 loadings in aqueous AMP + MeOH solution at different temperature and partial pressuresTHIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV

Introduction to natural gas hydrates extraction methods

A type of low-carbon energy source with abundant reserves and a high calorific value is natural gas. Compared to coal and oil, it is cleaner and more effective. One of the key strategies to lower carbon emissions worldwide is to increase the use of natural gas. The need for energy on a global scale has been rising recently. The energy recovered from conventional, renewable, or nuclear sources cannot, however, keep up with the enormous rise in demand for energy. Natural gas hydrate deposits, which are present all over the world, are a reliable supply of natural gas. Since they were originally discovered in the 1960s, natural gas hydrate deposits have been hailed as the most diversified source of energy, holding significantly more energy than both conventional and unconventional resources combined. In this chapter, various technologies to predict (geologic sampling and drilling, seismic prospecting, geochemical detection, and well logging) and extract (thermal properties, depressurization, chemical inhibitor injection, and gas displacement methods) natural gas from permafrost and oceanic natural hydrates are studied

Natural gas hydrate–related disasters and case studies

Clathrate hydrates, which develop at low temperatures and high pressures, are known as gas hydrates. Resources for natural gas hydrates are dispersed around the globe and have stayed steady for millions of years. Permafrost and coastal or marine reservoirs both contain these resources. Cages of water that capture small gas molecules like CH4, C2H6, and C3H8 give rise to gas hydrates. Notably, gas hydrate plugs and their dissociation have significant negative effects on flowline operations in terms of safety and cost. We may recommend economic risk management to prevent hydrate formation based on prior research on employing thermodynamic and kinetic inhibitors to prevent hydrate plugs from developing. This chapter goes into great depth about these safety concerns. Moreover, seven case studies related to hydrate disasters and preventions are studied in this chapter. The mentioned field case studies varied from Siberia, the Gulf of Mexico, and also the Dog Lake fields

Introduction to natural gas hydrates extraction methods

A type of low-carbon energy source with abundant reserves and a high calorific value is natural gas. Compared to coal and oil, it is cleaner and more effective. One of the key strategies to lower carbon emissions worldwide is to increase the use of natural gas. The need for energy on a global scale has been rising recently. The energy recovered from conventional, renewable, or nuclear sources cannot, however, keep up with the enormous rise in demand for energy. Natural gas hydrate deposits, which are present all over the world, are a reliable supply of natural gas. Since they were originally discovered in the 1960s, natural gas hydrate deposits have been hailed as the most diversified source of energy, holding significantly more energy than both conventional and unconventional resources combined. In this chapter, various technologies to predict (geologic sampling and drilling, seismic prospecting, geochemical detection, and well logging) and extract (thermal properties, depressurization, chemical inhibitor injection, and gas displacement methods) natural gas from permafrost and oceanic natural hydrates are studied

Dynamic Modeling of Charge and Discharge of Adsorbed Natural Gas storage Tank

Recently, adsorbed natural gas (ANG) has been considered as a low pressure and safe method for storage of natural gas, especially in vehicles. Nevertheless, the usage of the ANG storage system is hindered by the thermal effects due to both heat of adsorption and desorption during the charge and discharge processes and hence, an effective thermal enhancement is essential for the development of this technology. The purpose of this study is the investigation of transient thermal behavior of an ANG tank during charge and discharge cycles. There is a gas diffuser at the center of the tank to improve its temperature fluctuations by changing the flow direction from axial to radial. In this study, mass and energy equations were first derived and the resulting equation system was solved by implicit finite difference numerical method. By solving these equations, radial temperature and pressure distributions of adsorbent bed were obtained over time. Then, the effective parameters on the temperature fluctuations and efficiency of the ANG tank were studied. Numerical results show that the gas diffuser increases dynamic efficiency around 5% during the charge and discharge cycles. The results also show that the time of process, adsorbent bed thermal conductivity, convection heat transfer coefficient, tank geometry and dimensionless Biot and Fourier numbers are important factors on the efficiency enhancement. Also it was shown that high penetration resistance of the adsorbent bed may have a significant impact on the storage capacity and charge process time of the ANG tank