Facilitating role of Pd for hydrogen, oxygen and water adsorption/desorption processes from bulk CeO2 and CeO2/γ-Al2O3

2019 ◽  
Vol 323 ◽  
pp. 141-147 ◽  
Author(s):  
Deniz Kaya ◽  
Dheerendra Singh ◽  
Serkan Kincal ◽  
Deniz Uner
Keyword(s):  
Water Adsorption ◽  
Adsorption Desorption

Microscopic Insights into Water Adsorption in Carbon Nanopore – The Role of Acidic and Basic Functional Groups and their Configurations

2021 ◽  
Author(s):  
Lumeng Liu ◽  
Wenmao Zeng ◽  
Shiliang Johnathan Tan ◽  
Meng Liu ◽  
Duong Do
Keyword(s):  
Functional Groups ◽  
Porous Carbon ◽  
Water Adsorption ◽  
Water Clusters ◽  
Pivotal Role

Functional groups (FGs) in porous carbon play a pivotal role in water adsorption by nucleating water clusters followed by their coalescence, the process for which is the precursor for the...

Mixed-Solvothermal Synthesis of MIL-101(Cr) and Its Water Adsorption/Desorption Performance

2019 ◽  
Vol 58 (8) ◽  
pp. 2983-2990 ◽  
Author(s):  
Bingqiong Tan ◽  
Yanshu Luo ◽  
Xianghui Liang ◽  
Shuangfeng Wang ◽  
Xuenong Gao ◽  
...  
Keyword(s):  
Solvothermal Synthesis ◽  
Water Adsorption ◽  
Adsorption Desorption

Effects of Carbonation on the Specific Surface BET of Cement Mortar Measured by Two Different Methods: Nitrogen Adsorption and Water Adsorption

2014 ◽  
Vol 931-932 ◽  
pp. 421-425 ◽  
Author(s):  
Son Tung Pham ◽  
William Prince
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Water Adsorption ◽  
Cement Mortar ◽  
Nitrogen Adsorption ◽  
Accelerated Carbonation ◽  
Molecular Sizes ◽  
The Difference ◽  
Adsorption Desorption

The objective of this work was to examine the microstructural changes caused by the carbonation of normal mortar. Samples were prepared and subjected to accelerated carbonation at 20°C, 65% relative humidity and 20% CO2concentration. The evolutions of the pore size distribution and the specific surface area during carbonation were calculated from the adsorption - desorption isotherms of water vapour and nitrogen. Conflicts observed in the results showed that the porous domains explored by these two methods are not the same due to the difference in molecular sizes of nitrogen and water. These two techniques therefore help to complementarily evaluate the effects of carbonation. The study also helped to explain why results in the literature diverge greatly on the influence of carbonation on specific surface area.

scholarly journals Pore Size-Dependent Structure of Confined Water in Mesoporous Silica Films from Water Adsorption/Desorption Using ATR–FTIR Spectroscopy

Langmuir ◽  
2019 ◽  
Vol 35 (37) ◽  
pp. 11986-11994 ◽  
Author(s):  
Bettina Baumgartner ◽  
Jakob Hayden ◽  
Jérôme Loizillon ◽  
Sophia Steinbacher ◽  
David Grosso ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Ftir Spectroscopy ◽  
Pore Size ◽  
Water Adsorption ◽  
Confined Water ◽  
Silica Films ◽  
Size Dependent ◽  
Adsorption Desorption

Carbonised polyaniline and polypyrrole: towards advanced nitrogen-containing carbon materials

2013 ◽  
Vol 67 (8) ◽  
Author(s):  
Gordana Ćirić-Marjanović ◽  
Igor Pašti ◽  
Nemanja Gavrilov ◽  
Aleksandra Janošević ◽  
Slavko Mentus
Keyword(s):  
Electrical Conductivity ◽  
Carbon Materials ◽  
Modern Technology ◽  
Electron Microscopies ◽  
Transmission Electron ◽  
Elemental Analyses ◽  
Adsorption Desorption

AbstractPolyaniline (PANI) and polypyrrole (PPY) undergo carbonisation in an inert/reduction atmosphere and vacuum, yielding different nitrogen-containing carbon materials. This contribution reviews various procedures for the carbonisation of PANI and PPY precursors, and the characteristics of obtained carbonised PANI (C-PANI) and carbonised PPY (C-PPY). Special attention is paid to the role of synthetic procedures in tailoring the formation of C-PANI and C-PPY nanostructures and nanocomposites. The review considers the importance of scanning and transmission electron microscopies, XPS, FTIR, Raman, NMR, and EPR spectroscopies, electrical conductivity and adsorption/desorption measurements, XRD, and elemental analyses in the characterisation of C-PANIs and C-PPYs. The application of C-PANI and C-PPY in various fields of modern technology is also reviewed.

scholarly journals Adsorption of humic acid on mesoporous carbons prepared from poly- (ethylene terephthalate) templated with magnesium compounds

2012 ◽  
Vol 14 (4) ◽  
pp. 95-99 ◽  
Author(s):  
Justyna Karolczyk ◽  
Sylwia Mozia ◽  
Antoni W. Morawski ◽  
Jacek Przepiórski
Keyword(s):  
Humic Acid ◽  
Water Adsorption ◽  
Ethylene Terephthalate ◽  
Porous Carbons ◽  
Preparation Conditions ◽  
Poly Ethylene Terephthalate ◽  
Magnesium Compounds ◽  
Textural Parameters ◽  
Poly Ethylene

Abstract Porous carbons obtained from poly(ethylene terephtalate) contained in a mixture with either MgCO3 or Mg(OH)2 were examined as adsorbents for removal of humic acid from water. Adsorption of the model contaminants is discussed in relation to the textural parameters of the obtained carbon materials. Pore structure parameters of the carbonaceous materials were strongly influenced by preparation conditions including temperature and relative amounts of the inorganics used during preparations as template. Porous carbons prepared revealed a potential to purify water from the model contaminant of high molecular weight. The results presented confirmed a key role of mesoporosity in the adsorption of humic acid. Fluorescence spectroscopy was confirmed to be an useful method to evaluate concentration of humic acid in water.

Clustering of water molecules on model soot particles: an ab initio study

2005 ◽  
Vol 1 (4) ◽  
pp. 277-287 ◽  
Author(s):  
B. Collignon ◽  
P.N.M. Hoang ◽  
S. Picaud ◽  
J.C. Rayez
Keyword(s):  
Water Adsorption ◽  
Water Molecules ◽  
Quantum Calculations ◽  
Soot Particles ◽  
Small Water ◽  
Graphite Crystallite ◽  
The Face ◽  
Oniom Approach ◽  
Face Side

Clustering of water molecules on model soot particles is studied by means of quantum calculations based on the ONIOM approach. The soot particles are modeled by anchoring OH or COOH groups on the face side or on the edges of a graphite crystallite of nanometer size. The quantum calculations aim at characterizing the adsorption properties (structure and adsorption energy) of small water aggregates containing up to 5 water molecules, in order to better understand at a molecular level the role of these OH and COOH groups on the behavior with respect to water adsorption of graphite surface modelling soot emitted by aircraft.

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