scholarly journals Anomalous Isosteric Enthalpy of Adsorption of Methane on Zeolite-Templated Carbon

2013 ◽  
Vol 135 (3) ◽  
pp. 990-993 ◽  
Author(s):  
Nicholas P. Stadie ◽  
Maxwell Murialdo ◽  
Channing C. Ahn ◽  
Brent Fultz
Keyword(s):  
Enthalpy Of Adsorption ◽  
Isosteric Enthalpy Of Adsorption ◽  
Adsorption Of Methane ◽  
Templated Carbon

scholarly journals Isosteric Enthalpy Behavior of CO2 Adsorption on Micro-Mesoporous Materials: Carbon Microfibers (CMFs), SBA-15, and Amine-Functionalized SBA-15

2021 ◽  
Vol 5 (4) ◽  
pp. 102
Author(s):  
Reyna Ojeda-López ◽  
Armando Domínguez-Ortiz ◽  
Carlos Felipe ◽  
A. Cervantes-Uribe ◽  
Isaac J. Pérez-Hermosillo ◽  
...  
Keyword(s):  
Mesoporous Materials ◽  
Mesoporous Material ◽  
Reference Value ◽  
Santa Barbara ◽  
Microporous Material ◽  
Clapeyron Equation ◽  
Enthalpy Of Adsorption ◽  
Amine Functionalized ◽  
Isosteric Enthalpy Of Adsorption ◽  
Carbon Microfibers

The isosteric enthalpy of adsorption (∆adsh ) of CO2 in three different micro and mesoporous materials was evaluated in this work. These materials were a microporous material with functional groups of nitrogen and oxygen (CMFs, carbon microfibers), a mesoporous material with silanol groups (SBA-15, Santa Barbara Amorphous), and a mesoporous material with amine groups (SBA-15_APTES, SBA-15 amine-functionalized with (3-Aminopropyl)-triethoxysilane). The temperature interval explored was between 263 K and 303 K, with a separation of 5 K between each one, so a total of nine CO2 isotherms were obtained. Using the nine isotherms and the Clausius–Clapeyron equation, the reference value for ∆adsh was found. The reference value was compared with those ∆adsh obtained, considering some arrangement of three or five CO2 isotherms. Finally, it was found that at 298 K and 1 bar, the total amount of CO2 adsorbed is 2.32, 0.53, and 1.37 mmol g−1 for CMF, SBA-15, and SBA-15_APTES, respectively. However, at a coverage of 0.38 mmol g−1, ∆adsh is worth 38, 30, and 29 KJ mol−1 for SBA-15_APTES, CMFs, and SBA-15, respectively. So, physisorption predominates in the case of CMF and SBA-15 materials, and the ∆adsh values significantly coincide regardless of whether the isotherms arrangement used was three or five. Meanwhile, in SBA-15_APTES, chemisorption predominates as a consequence of the arrangements used to obtain . This happens in such a way that the use of low temperatures (263–283 K) tends to produce higher ∆adsh values, while the use of high temperatures (283–303 K) decreases the ∆adsh values.

Adsorption Isotherms and Isosteric Enthalpy of Adsorption for Assorted Refrigerants on Activated Carbons

2012 ◽  
Vol 57 (10) ◽  
pp. 2766-2773 ◽  
Author(s):  
Wai Soong Loh ◽  
Azhar Bin Ismail ◽  
Baojuan Xi ◽  
Kim Choon Ng ◽  
Won Gee Chun
Keyword(s):  
Adsorption Isotherms ◽  
Activated Carbons ◽  
Enthalpy Of Adsorption ◽  
Isosteric Enthalpy Of Adsorption

Predicting Neopentane Isosteric Enthalpy of Adsorption at Zero Coverage in MCM-41

Langmuir ◽  
2011 ◽  
Vol 27 (11) ◽  
pp. 6738-6743 ◽  
Author(s):  
Carmelo Herdes ◽  
Carlos Augusto Ferreiro-Rangel ◽  
Tina Düren
Keyword(s):  
Enthalpy Of Adsorption ◽  
Isosteric Enthalpy Of Adsorption ◽  
Mcm 41

Adsorption of Vapours of Some Organic Compounds on Surface of Iron-Substituted Layered Vanadyl Phosphate

2000 ◽  
Vol 65 (1) ◽  
pp. 47-57 ◽  
Author(s):  
Pavel Hradil ◽  
Jiří Votinský ◽  
Karel Komárek ◽  
Vítězslav Zima ◽  
Jaroslava Kalousová ◽  
...  
Keyword(s):  
Organic Compounds ◽  
Organic Molecules ◽  
Ferric Ions ◽  
Vanadyl Phosphate ◽  
Enthalpy Of Adsorption ◽  
Adsorbent Surface ◽  
Specific Retention Volumes ◽  
Specific Retention ◽  
Retention Volumes ◽  
Chromatographic Measurement

Gas chromatographic measurement of specific retention volumes of vapours of selected groups of organic compounds has been used to determine differential molar enthalpy of adsorption of their molecules on the surface of layered vanadyl phosphate substituted with ferric ions having the composition of [Fe(H2O)]0.20(VO)0.80PO4. Various types of bonds of the molecules to the surface of the layered adsorbent including their probable orientation with respect to the layers have been discussed. It was observed a dependence of the specific peak elution volume and shape of chromatographic peak on the sample size in the cases of those compounds whose molecules are chemically bound to the adsorbent surface. A connection is pointed out between the adsorption strength of the organic molecules on the layered adsorbent and the tendency of the system to undergo intercalation reaction.

Effect of Si/Al ratio in Faujasite structure on adsorption of methane and nitrogen: A molecular dynamics study

2021 ◽  
Author(s):  
Hojatollah Moradi ◽  
Hedayat Azizpour ◽  
Hossein Bahmanyar ◽  
Nariman Rezamandi ◽  
Payam Zahedi
Keyword(s):  
Molecular Dynamics ◽  
Adsorption Of Methane

Kinetics of the activated dissociative adsorption of methane on the low index planes of nickel single crystal surfaces

1987 ◽  
Vol 87 (4) ◽  
pp. 2305-2315 ◽  
Author(s):  
Thomas P. Beebe ◽  
D. Wayne Goodman ◽  
Bruce D. Kay ◽  
John T. Yates
Keyword(s):  
Single Crystal ◽  
Dissociative Adsorption ◽  
Crystal Surfaces ◽  
Single Crystal Surfaces ◽  
Nickel Single Crystal ◽  
Kinetics Of ◽  
Adsorption Of Methane

Preferential Adsorption of Methane over Hydrogen on Certain Coals

1979 ◽  
Vol 18 (3) ◽  
pp. 299-300 ◽  
Author(s):  
Ralph T. Yang ◽  
Rei T. Liu
Keyword(s):  
Preferential Adsorption ◽  
Adsorption Of Methane

A comparison of hydrogen storage capacity of commercial and fly ash-derived zeolite X together with their respective templated carbon derivatives

2015 ◽  
Vol 40 (37) ◽  
pp. 12705-12712 ◽  
Author(s):  
Nicholas M. Musyoka ◽  
Jianwei Ren ◽  
Henrietta W. Langmi ◽  
Brian C. North ◽  
Mkhulu Mathe
Keyword(s):  
Fly Ash ◽  
Hydrogen Storage ◽  
Storage Capacity ◽  
Zeolite X ◽  
Hydrogen Storage Capacity ◽  
Templated Carbon
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