scholarly journals Defining a performance map of porous carbon sorbents for high-pressure carbon dioxide uptake and carbon dioxide–methane selectivity

2016 ◽  
Vol 4 (38) ◽  
pp. 14739-14751 ◽  
Author(s):  
Saunab Ghosh ◽  
Marta Sevilla ◽  
Antonio B. Fuertes ◽  
Enrico Andreoli ◽  
Jason Ho ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Pore Volume ◽  
Carbon Materials ◽  
Total Pore Volume ◽  
Uptake Capacity ◽  
Heteroatom Doping ◽  
Carbon Dioxide Uptake ◽  
Performance Map ◽  
Methane Selectivity

The relative influence of heteroatom doping, surface area, and total pore volume of highly microporous carbon materials on CO2 uptake capacity, and the CO2/CH4 selectivity, at high pressure (≤30 bar) is presented.

Highly Selective and Stable Carbon Dioxide Uptake in Polyindole-Derived Microporous Carbon Materials

2013 ◽  
Vol 47 (10) ◽  
pp. 5467-5473 ◽  
Author(s):  
Muhammad Saleh ◽  
Jitendra N. Tiwari ◽  
K. Christain Kemp ◽  
Muhammad Yousuf ◽  
Kwang S. Kim
Keyword(s):  
Carbon Dioxide ◽  
Carbon Materials ◽  
Microporous Carbon ◽  
Stable Carbon ◽  
Carbon Dioxide Uptake

scholarly journals Covalent triazine-based frameworks (CTFs) from triptycene and fluorene motifs for CO2 adsorption

2016 ◽  
Vol 4 (17) ◽  
pp. 6259-6263 ◽  
Author(s):  
Subarna Dey ◽  
Asamanjoy Bhunia ◽  
Dolores Esquivel ◽  
Christoph Janiak
Keyword(s):  
Carbon Dioxide ◽  
Surface Area ◽  
Co2 Adsorption ◽  
Uptake Capacity ◽  
Carbon Dioxide Uptake

Two microporous CTFs with triptycene (TPC) and fluorene (FL) have been synthesized through a mild AlCl3-catalyzed Friedel–Crafts reaction, with the highest surface area of up to 1668 m2 g−1 for non-ionothermal CTFs. CTF-TPC and CTF-FL show an excellent carbon dioxide uptake capacity of up to 4.24 mmol g−1 at 273 K and 1 bar.

scholarly journals Preparation of Active Carbon by Additional Activation with Potassium Hydroxide and Characterization of Their Properties

2016 ◽  
Vol 2016 ◽  
pp. 1-4 ◽  
Author(s):  
Bronislaw Buczek
Keyword(s):  
Carbon Dioxide ◽  
Particle Size ◽  
High Pressure ◽  
Active Carbon ◽  
Potassium Hydroxide ◽  
Pressure Swing Adsorption ◽  
Total Pore Volume ◽  
Micropore Volume ◽  
Pressure Swing

A commercially available activated carbon was used to prepare active carbonviareactivation with KOH at 750°C. Active carbon was obtained with 60.5% yield. The resulting active carbon showed a well-developed porous structure with specific surface area 2939 m2/g, total pore volume 1.488 cm3/g, and micropore volume 1.001 cm3/g. Process reactivation of carbon changes its particle size as well as density properties and increases by nearly twice the amounts of methane and carbon dioxide adsorbed under high pressure conditions. Such active carbon may be used to enrich methane or carbon dioxide by pressure swing adsorption technique. Other possible applications of reactivated carbon are storage of hydrogen and methane and sequestration of carbon dioxide.

scholarly journals Some Surface Properties of Activated Carbons Prepared by Gasification with Different Gases

1997 ◽  
Vol 15 (9) ◽  
pp. 707-715 ◽  
Author(s):  
Amina A. Attia
Keyword(s):  
Carbon Dioxide ◽  
Surface Area ◽  
Water Vapour ◽  
Pore Volume ◽  
Activated Carbons ◽  
Total Pore Volume ◽  
Surface Areas ◽  
Adsorption Of Nitrogen ◽  
Adsorption Of Water ◽  
Different Gases

A non-activated carbon ‘D’ was obtained by carbonizing date pits at 773 K in a limited supply of air. Activated carbons were obtained by gasifying portions of ‘D’ with air at 773 K, carbon dioxide at 1123 K, or steam at 1173 K, all to different burn-offs between 15% and 60%. The adsorption of nitrogen at 77 K and of carbon dioxide at 298 K was investigated using a volumetric adsorption apparatus of a conventional type. The adsorption of water vapour at 298 K and the chemisorption of pyridine at 423 K was followed by means of quartz spring balances. Gasification with oxidizing gases increased the surface area and total pore volume, as measured by nitrogen or carbon dioxide adsorption. In most cases, comparable surface areas were measured by nitrogen and carbon dioxide. The adsorption of water vapour depended on the percentage burn-off and the gasification conditions. Chemisorption of pyridine at 423 K was found to be related to the chemistry of the surface rather than to the surface area or total pore volume.

scholarly journals Low-cost natural carbon dioxide sorbents available in the Czech Republic

Paliva ◽  
2021 ◽  
pp. 86-95
Author(s):  
Marek Staf ◽  
Barbora Votavová
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Gas Flow ◽  
Initial Conditions ◽  
Low Cost ◽  
Reference Sample ◽  
Gaseous Mixture ◽  
Total Pore Volume ◽  
Absolute Pressure ◽  
Adsorption Capacities

The article deals with the issue of carbon dioxide adsorption on mineral samples, two of which are rich in montmorillonite and one in kaolinite. The last comparative sample is clinoptilolite, which is widely used as a sorbent in agriculture, water treatment, etc. The theoretical part summarizes several current researches on the use of bentonites as adsorbents, both in their raw form and after various chemical treatments. The study presented here does not suggest any modification procedure, but tests untreated samples and samples subjected to calcinations at temperatures of 250-750 ° C. The calcination of units of grams was carried out by means of a carousel TGA, which made it possible to record curves of mass changes and to obtain a sufficient amount of calcinates for further analyses at the same time. From the point of view of achieving the highest specific surface area and the total pore volume, the optimal calcination temperature for the phyllosilicate samples ranged from 250 to 450 °C. Natural zeolite, on the other hand, showed a deterioration of both of these parameters at any temperature exceeding 150 °C. The same temperature dependence was found in the case of adsorption capacities determined by an automatic analyser Autosorb IQ using pure CO2. Measurements on this instrument also confirmed that selected inexpensive natural materials provide comparable adsorption capacities as the commercially available 13X molecular sieve used as a reference sample. Based on the performed analyses, the initial conditions of sample preparation for the upcoming measurement of adsorption properties on a larger apparatus operating in the PSA/TSA mode were determined. The primary aim of the tests using the selfdesigned high-pressure adsorption unit will be to determine the adsorption capacities that will take into account the temperature and pressure conditions in a real postcombustion carbon dioxide capture system. Unlike the automatic analyser described above, it will be possible to quantify the influence of important factors such as: flue gas humidity, the presence of other permanent gases (especially SO2) and last but not least various CO2 partial pressures and absolute pressure during adsorption and desorption. The experiments will verify the extent to which the presence of noncondensing moisture in the gaseous mixture is problematic. In the case of phyllosilicates, it is not just the parallel adsorption of H2O that affects the adsorption capacity available for CO2 capture. It will be empirically determined to what extent the swelling of the sorbent occurs in the wet gas, changing the gas flow through the layer and especially the pressure loss. The results of measurements on high-pressure apparatus will be the basis for the design and construction of a larger pilot scale unit.

scholarly journals Melt Amorphisation of Orlistat with Mesoporous Silica Using a Supercritical Carbon Dioxide: Effects of Pressure, Temperature, and Drug Loading Ratio and Comparison with Other Conventional Amorphisation Methods

Pharmaceutics ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 377
Author(s):  
Heejun Park ◽  
Kwang-Ho Cha ◽  
Seung Hyeon Hong ◽  
Sharif Md Abuzar ◽  
Eun-Sol Ha ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Mesoporous Silica ◽  
Dissolution Rate ◽  
Supercritical Fluid ◽  
Pore Volume ◽  
Total Pore Volume ◽  
Content Uniformity ◽  
Mass Ratio ◽  
Supercritical Carbon

The aim of this work was to develop an amorphous orlistat-loaded mesoporus silica formulation using the melt-amorphisation by supercritical fluid (MA-SCF) and to investigate the effects of pressure and temperature on the pharmaceutical properties of the developed formulation. In addition, the effect of orlistat mass ratio to the mesoporus silica was also evaluated. The carbon dioxide was used as a supercritical fluid, and Neusilin®UFL2 was selected as the mesoporous silica. For comparison with conventional amorphisation methods, orlistat formulations were also prepared by solvent evaporation and hot melt methods. Various pharmaceutical evaluations including differential scanning calorimetry, powder X-ray diffraction, scanning electron microscopy, specific surface area, total pore volume, and content uniformity were performed to characterise the prepared orlistat formulation. The melting point depression and the solubility of orlistat in supercritical carbon dioxide (SC-CO2) were selected for the interpretation of evaluated results in relation to temperature and pressure. The total pore volume of the prepared orlistat-loaded mesoporus silica decreased with an increasing density of SC-CO2 to about 500 g/L at a constant temperature or pressure. From these results, it was suggested that increasing the density of SC-CO2 to about 500 g/L could result in the easier penetration of CO2 into molten orlistat and lower viscosity, hence facilitating the introduction and loading of orlistat into the pores of Neusilin®UFL2. However, when the density of SC-CO2 increased to more than 500 g/L, the total pore volume increased, and this may be due to the release out of orlistat from the pores of Neusilin®UFL2 by the increased orlistat solubility in SC-CO2. Interestingly, as the total pore volume decreased by the filling of the drug, the drug crystallinity decreased; hence, the dissolution rate increased. Furthermore, it was shown that the most desirable mass ratio of Neusilin®UFL2:orlistat for the amorphisation was 1:0.8 at an optimised supercritical condition of 318 K and 10 MPa. Compared with other amorphisation methods, only the sample prepared by the MA-SCF method was in pure amorphous state with the fastest dissolution rate. Therefore, it was concluded that the amorphous orlistat-loaded mesoporus silica prepared using MA-SCF under optimised conditions was more advantageous for enhancing the dissolution rate of orlistat than other conventional amorphisation methods.

scholarly journals New Porous Silicon-Containing Organic Polymers: Synthesis and Carbon Dioxide Uptake

Processes ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 1488
Author(s):  
Safaa H. Mohamed ◽  
Ayad S. Hameed ◽  
Emad Yousif ◽  
Mohammad Hayal Alotaibi ◽  
Dina S. Ahmed ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Surface Area ◽  
Pore Volume ◽  
High Surface ◽  
High Surface Area ◽  
Organic Polymers ◽  
Average Pore ◽  
Carbon Dioxide Uptake ◽  
Design And Synthesis ◽  
The One

The design and synthesis of new multifunctional organic porous polymers has attracted significant attention over the years due to their favorable properties, which make them suitable for carbon dioxide storage. In this study, 2-, 3-, and 4-hydroxybenzaldehyde reacted with phenyltrichlorosilane in the presence of a base, affording the corresponding organosilicons 1–3, which further reacted with benzidine in the presence of glacial acetic acid, yielding the organic polymers 4–6. The synthesized polymers exhibited microporous structures with a surface area of 8.174–18.012 m2 g−1, while their pore volume and total average pore diameter ranged from 0.015–0.035 cm3 g−1 and 1.947–1.952 nm, respectively. In addition, among the synthesized organic polymers, the one with the meta-arrangement structure 5 showed the highest carbon dioxide adsorption capacity at 323 K and 40 bar due to its relatively high surface area and pore volume.

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