A computational study on the hydrogen adsorption capacity of various lithium-Doped boron hydrides

2011 ◽  
Vol 33 (4) ◽  
pp. 425-434 ◽  
Author(s):  
Sudip Pan ◽  
Santanab Giri ◽  
Pratim K. Chattaraj
Keyword(s):  
Adsorption Capacity ◽  
Hydrogen Adsorption ◽  
Computational Study ◽  
Boron Hydrides

Processing of Iridium Doped Materials and Experimental Investigation of Their Hydrogen Adsorption Capacity

2018 ◽  
Vol 69 (6) ◽  
pp. 1468-1472
Author(s):  
Radu Mirea ◽  
Mihai Iordoc ◽  
Gabriela Oprina ◽  
Gimi Rimbu
Keyword(s):  
Adsorption Capacity ◽  
Hydrogen Adsorption ◽  
Weight Ratio ◽  
H2 Adsorption ◽  
Cyclic Voltametry ◽  
Physical Chemical ◽  
Good Consistency ◽  
Metal Doped ◽  
And Storage ◽  
Poly Aniline

The paper aims to present the investigation of H2 adsorption capacity in metal doped nanostructured materials, by using two methods. Carbonic materials are considered to be one of the most promising materials to be used for hydrogen adsorption and storage. They have different applications and one of the most important is considered to be fuel cells technology. By using metals for doping these materials, the adsorption capacity increases, thus approaching the target of 6.5% weight ratio of H2 adsorbed in a substrate. Within these investigations multi-wall nanotubes and poly-aniline have been used as substrates. The poly-aniline has been prepared and doped in laboratory while the nanotubes used in experiments have been purchased from the market and afterwards doped in laboratory. The doping procedure consists of a physical-chemical method which involves salts of the metal for doping and the use of ultrasounds in order to activate the substrate for doping. The adsorption capacity of the carbonic materials has been determined by using spill over phenomena in a PCT Pro-User apparatus, provided by SETARAM and also by cyclic voltametry, by using VoltaLab-40 apparatus. In order to investigate the adsorption capacity of the nanostructured carbonic materials, the experiments have been carried out at different pressures. Both substrates have been characterized in order to determine their porosity, BET surface and structure. The collected data have been processed by using the PCT Pro-User apparatus�s software. The results have been compared with the available data from literature and a good consistency was found.

scholarly journals Pinecone-Derived Activated Carbons as an Effective Medium for Hydrogen Storage

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2237
Author(s):  
Sara Stelitano ◽  
Giuseppe Conte ◽  
Alfonso Policicchio ◽  
Alfredo Aloise ◽  
Giovanni Desiderio ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Hydrogen Storage ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Hydrogen Adsorption ◽  
Activated Carbons ◽  
Chemical Activation ◽  
Textural Properties ◽  
Biomass Waste ◽  
Wavelength Dispersive Spectrometry

Pinecones, a common biomass waste, has an interesting composition in terms of cellulose and lignine content that makes them excellent precursors in various activated carbon production processes. The synthesized, nanostructured, activated carbon materials show textural properties, a high specific surface area, and a large volume of micropores, which are all features that make them suitable for various applications ranging from the purification of water to energy storage. Amongst them, a very interesting application is hydrogen storage. For this purpose, activated carbon from pinecones were prepared using chemical activation with different KOH/precursor ratios, and their hydrogen adsorption capacity was evaluated at liquid nitrogen temperatures (77 K) at pressures of up to 80 bar using a Sievert’s type volumetric apparatus. Regarding the comprehensive characterization of the samples’ textural properties, the measurement of the surface area was carried out using the Brunauer–Emmett–Teller method, the chemical composition was investigated using wavelength-dispersive spectrometry, and the topography and long-range order was estimated using scanning electron microscopy and X-ray diffraction, respectively. The hydrogen adsorption properties of the activated carbon samples were measured and then fitted using the Langmuir/ Töth isotherm model to estimate the adsorption capacity at higher pressures. The results showed that chemical activation induced the formation of an optimal pore size distribution for hydrogen adsorption centered at about 0.5 nm and the proportion of micropore volume was higher than 50%, which resulted in an adsorption capacity of 5.5 wt% at 77 K and 80 bar; this was an increase of as much as 150% relative to the one predicted by the Chahine rule.

Effect of nickel loading on hydrogen adsorption capacity of different mesoporous supports

Adsorption ◽  
2019 ◽  
Vol 25 (7) ◽  
pp. 1409-1418
Author(s):  
P. M. Carraro ◽  
F. A. Soria ◽  
E. G. Vaschetto ◽  
K. Sapag ◽  
M. I. Oliva ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Hydrogen Adsorption ◽  
Mesoporous Supports

Hydrogen Storage using Carbon Materials at Room Temperature

2003 ◽  
Vol 801 ◽  
Author(s):  
H. Kajiura ◽  
S. Tsutsui ◽  
K. Kadono ◽  
Y. Murakami ◽  
M. Kakuta ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Room Temperature ◽  
Carbon Materials ◽  
Hydrogen Adsorption ◽  
Constant Pressure ◽  
Graphite Powder ◽  
Milling Process ◽  
Volumetric Method ◽  
Hydrogen Molecules ◽  
Available Carbon

ABSTRACTThe hydrogen adsorption capacity of commercially available carbon materials with different nanostructures was measured at room temperature using an apparatus based on a volumetric method with an error of less than 0.04 wt% per one gram of sample. The obtained results suggest that nanosutures of the sample influence the hydrogen adsorption capacity. To confirm this hypothesis, we prepared nanostructured graphite from graphite powder using a mechanical milling process at a pressure of 2.0 × 10−4 Pa. The untreated graphite adsorbed 0.02wt% of hydrogen at 6 MPa at room temperature, while 0.20 − 0.25 wt% of hydrogen can be repeatedly adsorbed by the nanostructured graphite. Measurements of the hydrogen adsorption rate at constant pressure and pore-size distribution imply that the hydrogen molecules are adsorbed through a diffusion process in pores with a diameter less than 1 nm.

Preferred Hydrogen Adsorption Sites in Various MOFs-A Comparative Computational Study

ChemPhysChem ◽  
2009 ◽  
Vol 10 (15) ◽  
pp. 2647-2657 ◽  
Author(s):  
Michael Fischer ◽  
Frank Hoffmann ◽  
Michael Fröba
Keyword(s):  
Hydrogen Adsorption ◽  
Computational Study ◽  
Adsorption Sites

Improving the synthesis of high purity carbon nanotubes in a catalytic fluidized bed reactor and their comparative test for hydrogen adsorption capacity

2008 ◽  
Vol 133-135 ◽  
pp. 815-821 ◽  
Author(s):  
F.R. García-García ◽  
M. Pérez-Cabero ◽  
D.M. Nevskaia ◽  
I. Rodríguez-Ramos ◽  
A. Guerrero-Ruiz
Keyword(s):  
Carbon Nanotubes ◽  
Adsorption Capacity ◽  
Fluidized Bed ◽  
High Purity ◽  
Hydrogen Adsorption ◽  
Fluidized Bed Reactor ◽  
Comparative Test

A comparative computational study on hydrogen adsorption on the Ag+, Cu+, Mg2+, Cd2+, and Zn2+ cationic sites in zeolites

2016 ◽  
Vol 18 (18) ◽  
pp. 12592-12603 ◽  
Author(s):  
Paweł Kozyra ◽  
Witold Piskorz
Keyword(s):  
Hydrogen Adsorption ◽  
Computational Study ◽  
Antibonding Orbital ◽  
Oxygen Framework

Three essential factors have been identified (i–iii) for the interaction between H2 and Ag+, Cu+, Mg2+, Cd2+, and Zn2+ sites in zeolites: (i) donation from σH2 to the cation, (ii) π-backdonation from the cation to antibonding orbital of the molecule, and (iii) the interaction between H2 and oxygen framework which is crucial for H2 dissociation on Zn2+ sites.

scholarly journals Investigation of morphology and hydrogen adsorption capacity of disordered carbons

Carbon ◽  
2014 ◽  
Vol 80 ◽  
pp. 82-90 ◽  
Author(s):  
Lilin He ◽  
Yuri B. Melnichenko ◽  
Nidia C. Gallego ◽  
Cristian I. Contescu ◽  
Junjie Guo ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Hydrogen Adsorption
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