Microcalorimetric and IR spectroscopic studies of CO adsorption on molybdenum nitride catalysts

2003 ◽  
Vol 5 (8) ◽  
pp. 1703-1707 ◽  
Author(s):  
Zili Wu ◽  
A. Maroto-Valiente ◽  
A. Guerrero-Ruiz ◽  
I. Rodriguez-Ramos ◽  
Can Li ◽  
...  
Keyword(s):  
Co Adsorption ◽  
Spectroscopic Studies ◽  
Molybdenum Nitride ◽  
Ir Spectroscopic

Ag-loaded zeolites Y and USY as catalysts for selective ammonia oxidation

2016 ◽  
Vol 6 (6) ◽  
pp. 1651-1660 ◽  
Author(s):  
Kinga Góra-Marek ◽  
Karolina A. Tarach ◽  
Zofia Piwowarska ◽  
Marek Łaniecki ◽  
Lucjan Chmielarz
Keyword(s):  
Ammonia Oxidation ◽  
Co Adsorption ◽  
Spectroscopic Studies ◽  
The Status ◽  
Ir Spectroscopic

IR spectroscopic studies of NH3 and CO adsorption were applied to establish the status of Ag0 and Ag+ in silver loaded zeolites Y and USY.

IR spectroscopic studies of low-temperature CO adsorption on CaNaY zeolite

1983 ◽  
Vol 22 (1-2) ◽  
pp. 147-151 ◽  
Author(s):  
E. A. Paukshtis ◽  
R. I. Soltanov ◽  
E. N. Yurchenko
Keyword(s):  
Low Temperature ◽  
Co Adsorption ◽  
Spectroscopic Studies ◽  
Ir Spectroscopic

In Situ FT-IR Spectroscopic Studies of CO Adsorption on Fresh Mo2C/Al2O3Catalyst

2003 ◽  
Vol 107 (29) ◽  
pp. 7088-7094 ◽  
Author(s):  
Weicheng Wu ◽  
Zili Wu ◽  
Changhai Liang ◽  
Xiaowei Chen ◽  
Pinliang Ying ◽  
...  
Keyword(s):  
Co Adsorption ◽  
Spectroscopic Studies ◽  
Ft Ir ◽  
Ir Spectroscopic

Gas Cell Infrared and Attenuated Total Reflection Infrared Spectroscopic Studies for Organic–Inorganic Interactions in Adsorption of Fulvic Acid on the Goethite Surface Generating Carbon Dioxide

2021 ◽  
pp. 000370282199121
Author(s):  
Yuki Nakaya ◽  
Satoru Nakashima ◽  
Takahiro Otsuka
Keyword(s):  
Carbon Dioxide ◽  
Activation Energy ◽  
Fulvic Acid ◽  
Spectroscopic Studies ◽  
Reaction Model ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Gas Cell ◽  
Rate Determining Step ◽  
Ir Spectroscopic

The generation of carbon dioxide (CO2) from Nordic fulvic acid (FA) solution in the presence of goethite (α-FeOOH) was observed in FA–goethite interaction experiments at 25–80 ℃. CO2 generation processes observed by gas cell infrared (IR) spectroscopy indicated two steps: the zeroth order slower CO2 generation from FA solution commonly occurring in the heating experiments of the FA in the presence and absence of goethite (activation energy: 16–19 kJ mol–1), and the first order faster CO2 generation from FA solution with goethite (activation energy: 14 kJ mol–1). This CO2 generation from FA is possibly related to redox reactions between FA and goethite. In situ attenuated total reflection infrared (ATR-IR) spectroscopic measurements indicated rapid increases with time in IR bands due to COOH and COO– of FA on the goethite surface. These are considered to be due to adsorption of FA on the goethite surface possibly driven by electrostatic attraction between the positively charged goethite surface and negatively charged deprotonated carboxylates (COO–) in FA. Changes in concentration of the FA adsorbed on the goethite surface were well reproduced by the second order reaction model giving an activation energy around 13 kJ mol–1. This process was faster than the CO2 generation and was not its rate-determining step. The CO2 generation from FA solution with goethite is faster than the experimental thermal decoloration of stable structures of Nordic FA in our previous report possibly due to partial degradations of redox-sensitive labile structures in FA.

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