Adsorption isobars for CO on a Pt/Al2O3 catalyst at high temperatures using FTIR spectroscopy: isosteric heat of adsorption and adsorption model

Non-Calorimetric Determination of the Adsorption Heat of Volatile Organic Compounds under Dynamic Conditions

“…However, it is necessary to observe very cautiously whether the resulting isosteres match with straight lines, which relies strongly on the experimental conditions' accuracy. As reported, an error of  2K on temperature measurement may result in incertitude of ± 8 kJ/mol for isosteric heat value [39]. On the other hand, the application of this procedure for different coverage permits us to follow the o-xylene isosteric heat variation adsorption as a function of θ (θ = Qads/Qm), where Qads is the adsorbed amount for a given adsorption pressure and Qm is the loading capacity at monolayer calculated as previously indicated.…”

Impact of potassium on the heats of adsorption of adsorbed CO species on supported Pt particles by using the AEIR method

“…1, spectrum (a)) of (a) an IR band at 2050 cm À1 due to the L CO species on the Pt 0 sites that is observed at 2074 cm À1 in the absence of K [1-3], (b) broad IR band in the 2010-1900 cm À1 range with a maximum at 1952 cm À1 corresponding to the overlap of the IR bands of different B CO species on the Pt 0 sites and observed at 1835 cm À1 in the absence of K [1][2][3] and (c) a broad IR band at 1763 cm À1 that is not observed on Pt/Al 2 O 3 [1][2][3] corresponding to an adsorbed CO species denoted X Pt-K CO. In addition to the change in the number and positions of the IR bands, a significant decrease in the ratio of the intensities of the IR bands of the L and B CO species is observed from 8.4 to %1 in the absence [1][2][3] and in the presence ( Fig. 1) of K, respectively.…”

“…[9,14] method as described previously [1][2][3]. After drying for 12 h at room temperature, the solid was heated in air at 383 K for 12 h. Then KNO 3 was impregnated using the incipient wetness method.…”

“…The Adsorption Equilibrium Infrared spectroscopy method previously developed, permits determining the individual heats of adsorption of different adsorbed CO species on metal supported catalysts, in particular on Pt/Al 2 O 3 [1][2][3], by using a single isobar. This allows us to study the impacts of different experimental parameters on the heats of adsorption such as (a) the metal dispersion [4,5], (b) the nature of the support [6] and (c) the presence of coadsorbed species [7] on the Pt supported particles.…”

Thermodynamic analysis of adsorption process at a non-equilibrium steady state

“…So, it is important to obtain the isosteric heat of adsorption. At present, there are two ways to obtain its value: one is through direct measurement with experiment [4][5][6], which is generally used in scientific experiment due to its complication in operation, and the other is through calculation based on adsorption isotherms, which is widely used in practical cases [7][8][9][10][11][12].…”