Deposition parameters of air pollutants on solid surfaces, measured in the presence of surface and gaseous reactions, with a simultaneous determination of the experimental isotherms

Abatzoglou, Ch.; Iliopoulou, E.; Katsanos, Nicholas A.; Roubani‐Kalantzopoulou, F.; Kalantzopoulos, A.

doi:10.1016/s0021-9673(97)00232-x

Cited by 39 publications

(22 citation statements)

References 9 publications

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“…The main equation relies on the heights of the experimental peaks as a function of time and is obtained using Laplace’s space and time transforms: , where H (V) is defined as the peak heights, g (V cm 3 mol –1 ) the calibration factor of the detector and c ( l , t ) (mol cm –3 ) the measured concentration of the injected gas at x = l and time t (s). A i and B i were respectively the pre-exponential factors (V) and the exponential coefficients of time (s –1 ).…”

Section: Methodsmentioning

confidence: 99%

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Impact of Crystal Size on the Acidity and the Involved Interactions Studied by Conventional and Innovative Techniques

et al. 2017

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A series of β-zeolites with different sizes have been synthesized. Their size range from 10 μm to a few nanometers. The acidity measurement (i.e number, strength and location) were carried out by so-called conventional techniques: adsorption followed by infrared spectroscopy of various basic probe molecules (CO, C 2 H 4 , pyridine) and model reaction (n-hexane cracking). The extreme crystal downsize lowers the acid strength. These results are confirmed also by using an innovative technique: the reversed-flow inverse chromatography (RF-IGC). The involvement of the external and internal zeolitic species depend on the adsorbed molecules and the operating conditions: (i) the high content of extra-framework aluminum enhance the n-hexane cracking activity owing to the exaltation of the Brønsted sites strength, and (ii) the RF-IGC technique show an important involvement of the silanol groups (mainly present on the nanosized zeolite) in lateral interactions with ethylene.

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Section: Methodsmentioning

confidence: 99%

“…31,32 Calculations. The main equation relies on the heights of the experimental peaks as a function of time and is obtained using Laplace's space and time transforms: 31,33…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Impact of Crystal Size on the Acidity and the Involved Interactions Studied by Conventional and Innovative Techniques

et al. 2017

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“…35,36 Calculations. The main equation relies on the heights of the experimental peaks as a function of time and is obtained using Laplace's space and time transforms: 35,37…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

New Approach to the Acidity Characterization of Pristine Zeolite Crystals by Ethylene Using Reversed-Flow Inverse Gas Chromatography (RF-IGC)

et al. 2017

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The adsorption and diffusion are key parameters for the catalytic conversions of ethylene to hydrocarbons. Using microcrystals of beta zeolites and the reversed-flow inverse gas chromatography technique, a new approach is developed for the catalytic characterization of pristine crystals. On the basis of the monitoring of the dynamic concentration in a time-resolved way, this method allows one to follow the surface coverage and adsorption energies among other physicochemical criteria. Pristine crystals were synthesized to rule out the effect of surface defects. The impact of porosity and acidity was studied by ethylene adsorption over porous, nonporous, and acid materials. The acidity of the mother zeolite (acid and porous) was decreased by retro-exchanges and partial cokage. The modification of the ethylene sorption due to the Brønsted acidity was then highlighted. The local surface coverage was not affected by the presence of porosity, while a second adsorption phase of the ethylene was induced by the modification of the acidity. Moreover, a relation between the amount of Brønsted acidity and the ethylene lateral interactions measured by RF-IGC was evidenced.

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“…[13]. The kR symbol is identical with k 1 used there, and it is defined as "adsorption/desorption" here according to the meaning given by Smith [14].…”

Section: Theoreticalmentioning

confidence: 99%

“…The kR symbol is identical with k 1 used there, and it is defined as "adsorption/desorption" here according to the meaning given by Smith [14]. The solution follows exactly the same steps as there [13] with the omission of the terms containing kapp, since a negligible reaction of the adsorbates in the gas phase is assumed here. A summary of these steps is the following.…”

Section: Theoreticalmentioning

confidence: 99%

Dependence of adsorption rates with lateral interactions on local surface coverage of heterogeneous surfaces

et al. 2003

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SummaryAs local adsorption isotherm Ot changes wth tTme, Tt Tnduces a changTng wth Tt of both, the net experTmental adsorptTon rate O0~/Ot wTth lateral molecular interactTon, as well as the rate constants for adsorption (k~) and desorption (kd). All these changes are experimentally measured by applyTng the reversed-flow gas chromatographTc method, and a relatively sTmple equation.These calculations have been applied to the adsorption of dimethyl sulfide on pieces of Pen teli marble at 373 K, and to the adsorption of heptane on q' alumina at 383 K.

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Deposition parameters of air pollutants on solid surfaces, measured in the presence of surface and gaseous reactions, with a simultaneous determination of the experimental isotherms

Cited by 39 publications

References 9 publications

Impact of Crystal Size on the Acidity and the Involved Interactions Studied by Conventional and Innovative Techniques

Impact of Crystal Size on the Acidity and the Involved Interactions Studied by Conventional and Innovative Techniques

New Approach to the Acidity Characterization of Pristine Zeolite Crystals by Ethylene Using Reversed-Flow Inverse Gas Chromatography (RF-IGC)

Dependence of adsorption rates with lateral interactions on local surface coverage of heterogeneous surfaces

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