scholarly journals Adhesion Energies of Solvent Films to Pt(111) and Ni(111) Surfaces by Adsorption Calorimetry

ACS Catalysis ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 11819-11825 ◽  
Author(s):  
John R. Rumptz ◽  
Charles T. Campbell
Keyword(s):  
Adsorption Calorimetry

scholarly journals Water and Carbon Dioxide Adsorption on CaO(001) Studied via Single Crystal Adsorption Calorimetry

2021 ◽  
Author(s):  
J. Seifert ◽  
S. J. Carey ◽  
S. Schauermann ◽  
S. Shaikhutdinov ◽  
H.-J. Freund
Keyword(s):  
Adsorption Energy ◽  
Adsorbed Water ◽  
Spectroscopic Studies ◽  
Detector Response ◽  
Adsorption Calorimetry ◽  
Instrument Response Function ◽  
Line Shapes ◽  
Adsorption Sites ◽  
Saturation Coverage ◽  
Initial Adsorption

AbstractA new method to analyze microcalorimetry data was employed to study the adsorption energies and sticking probabilities of D2O and CO2 on CaO(001) at several temperatures. This method deconvolutes the line shapes of the heat detector response into an instrument response function and exponential decay functions, which correspond to the desorption of distinct surface species. This allows for a thorough analysis of the adsorption, dissociation, and desorption processes that occur during our microcalorimetry experiments. Our microcalorimetry results, show that D2O adsorbs initially with an adsorption energy of 85–90 kJ/mol at temperatures ranging from 120 to 300 K, consistent with prior spectroscopic studies that indicate dissociation. This adsorption energy decreases with increasing coverage until either D2O multilayers are formed at low temperatures (120 K) or the surface is saturated (> 150 K). Artificially producing defects on the surface by sputtering prior to dosing D2O sharply increases this adsorption energy, but these defects may be healed after annealing the surface to 1300 K. CO2 adsorbs on CaO(001) with an initial adsorption energy of ~ 125 kJ/mol, and decreases until the saturation coverage is reached, which is a function of surface temperature. The results showed that pre-adsorbed water blocks adsorption sites, lowers the saturation coverage, and lowers the measured adsorption energy of CO2. The calorimetry data further adds to our understanding of D2O and CO2 adsorption on oxide surfaces.

Structure and Energy Profile of the Skeletal Nickel Surface According to the Small-Angle X-Ray Diffraction and Adsorption Calorimetry Data

2020 ◽  
Vol 90 (9) ◽  
pp. 1787-1794
Author(s):  
V. V. Kuznetsov ◽  
T. Yu. Osadchaya ◽  
A. V. Afineevskii ◽  
D. A. Prozorov ◽  
M. V. Lukin ◽  
...  
Keyword(s):  
Small Angle ◽  
Nickel Surface ◽  
Energy Profile ◽  
X Ray Diffraction ◽  
Adsorption Calorimetry ◽  
Skeletal Nickel ◽  
X Ray ◽  
Calorimetry Data

Catalytic reaction energetics by single crystal adsorption calorimetry: hydrocarbons on Pt(111)

2008 ◽  
Vol 37 (10) ◽  
pp. 2172 ◽  
Author(s):  
Ole Lytken ◽  
Wanda Lew ◽  
Charles T. Campbell
Keyword(s):  
Single Crystal ◽  
Catalytic Reaction ◽  
Adsorption Calorimetry

CO2 gas-adsorption calorimetry applied to the study of chemically activated carbons

2018 ◽  
Vol 136 ◽  
pp. 753-760 ◽  
Author(s):  
Débora Aline Soares Maia ◽  
José Carlos Alexandre de Oliveira ◽  
Marcelo Sandro Nazzarro ◽  
Karim Manuel Sapag ◽  
Raul Horácio López ◽  
...  
Keyword(s):  
Gas Adsorption ◽  
Activated Carbons ◽  
Adsorption Calorimetry ◽  
Co2 Gas

Adsorption calorimetry

2019 ◽  
Vol 138 (4) ◽  
pp. 2577-2595
Author(s):  
Paola Rodríguez-Estupiñán ◽  
Liliana Giraldo ◽  
Juan Carlos Moreno-Piraján
Keyword(s):  
Adsorption Calorimetry

Methods of analysing morphology of kaolinites: relations between crystallographic and morphological properties

Clay Minerals ◽  
1986 ◽  
Vol 21 (1) ◽  
pp. 55-68 ◽  
Author(s):  
J.M. Cases ◽  
P. Cunin ◽  
Y. Grillett ◽  
C. Poinsignon ◽  
J. Yvon
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Surface Area ◽  
Lateral Surface ◽  
Morphological Properties ◽  
Surfactant Adsorption ◽  
Adsorption Calorimetry ◽  
Crystalline Sample ◽  
Transmission Electron ◽  
Total Specific Surface Area

AbstractA study was made of the extent to which the lateral surfaces contribute to the surface area of five kaolinites of different crystallinities. Methods used included the low-temperature adsorption of N2and Ar as measured by a volumetric technique coupled with microcalorimetry, the interpretation of the adsorption isotherms of alkyldodecylammonium ions, particle-size distribution curves, and shadowed transmission electron microscopy. With the exception of surfactant adsorption and adsorption calorimetry using Ar, these methods gave different and debatable results. For instance, specific lateral surface area values expressed as a percentage of total specific surface area varied from 17·0 to 40·4% for the most crystalline sample and from 12·0 to 54·3% for the least crystalline. It is shown that the decrease in crystallinity of samples is accompanied by a reduction in crystallite size from 0·8 to 0·08 µm and a decrease in lateral surface area from 34·0 to 12·0%.

Assessment of Carbon Monoxide Oxidation on Ni, Cu, and Ni-Cu/ZSM-5 Catalysts by Adsorption Calorimetry

2012 ◽  
Vol 4 (1) ◽  
pp. 39-48
Author(s):  
Liliana Giraldo ◽  
Juan Carlos Moreno-Piraján
Keyword(s):  
Carbon Monoxide ◽  
Carbon Monoxide Oxidation ◽  
Adsorption Calorimetry

scholarly journals Method for direct deconvolution of heat signals in transient adsorption calorimetry

2015 ◽  
Vol 633 ◽  
pp. 17-23 ◽  
Author(s):  
Christopher A. Wolcott ◽  
Charles T. Campbell
Keyword(s):  
Adsorption Calorimetry

Improved pyroelectric detectors for single crystal adsorption calorimetry from 100 to 350 K

2010 ◽  
Vol 81 (2) ◽  
pp. 024102 ◽  
Author(s):  
Wanda Lew ◽  
Ole Lytken ◽  
Jason A. Farmer ◽  
Matthew C. Crowe ◽  
Charles T. Campbell
Keyword(s):  
Single Crystal ◽  
Adsorption Calorimetry ◽  
Pyroelectric Detectors
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