Experimental and theoretical studies about the adsorption of toluene on ZSM5 and mordenite zeolites modified with Cs

Serra, Ramiro Marcelo; Miró, Eduardo Ernesto; Bolcatto, P. G.; Boix, Alicia Viviana

doi:10.1016/j.micromeso.2011.05.016

Cited by 57 publications

(30 citation statements)

References 36 publications

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“…The strength of the interaction between the cation and toluene can be another explanation. Indeed the cation Na + acts as a Lewis acid to form a strong interaction with π electrons in the case of toluene adsorption [37]. The interaction between Na + and toluene is greater than that between H + and toluene.…”

Section: Figures 3a and 3bmentioning

confidence: 99%

Fixed-bed adsorption of toluene on high silica zeolites: experiments and mathematical modelling using LDF approximation and a multisite model

Brodu

Sochard

Andriantsiferana

et al. 2015

Environmental Technology

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The adsorption of toluene (TOL) as a target volatile organic compound has been studied experimentally and modelled on various hydrophobic zeolites: Faujasite (FAU), ZSM-5 (Z) and Mordenite (MOR). The influence of the nature of the compensating cation (H+ or Na+) has also been investigated for ZSM-5 zeolite, which is known to possess three kinds of adsorption sites (sinusoidal channels, straight channels and intersections). Type I isotherms observed on FAU, Na-Z and MOR fitted well with the Langmuir model. A deviation from a type I isotherm was observed for H-Z, because of the structure of this zeolite. The Successive Langmuir Model was more successful to fit the 'bump' of the experimental curve than the Double Langmuir. Classical shapes were found for MOR, FAU and Na-Z breakthrough curves that were fitted with good accuracy using the Linear Driving Force (LDF) approximation. In the case of H-Z, a change of profile was observed during the dynamic adsorption and the differences seen between the Na-Z and H-Z behaviours were explained by the strong interactions between Na+ and adsorbed TOL at the intersection sites. The Na+ cations prevented reorientation of TOL molecules at the intersection and thereby avoided the filling of the sinusoidal channel segments. Thus, a specific model was developed for fitting the breakthrough curve of H-Z. The model developed took into account these two types of adsorption sites with the overall uptake for each site being given by an LDF approximation.

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Section: Figures 3a and 3bmentioning

confidence: 99%

Fixed-bed adsorption of toluene on high silica zeolites: experiments and mathematical modelling using LDF approximation and a multisite model

Brodu

Sochard

Andriantsiferana

et al. 2015

Environmental Technology

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“…XPS measurements were performed to determine the chemical state and the relative abundance of surface species on the CoM and Cs x CoM catalysts (calcined and after use in M a n u s c r i p t 13 the SCR of NOx with butane). The oxidation states of cesium and cobalt were determined by the deconvolution of the peaks corresponding to the region Cs 3d and Co 2p, respectively ( Table 2).…”

Section: Surface Analysismentioning

confidence: 99%

“…In this sense, the adsorption of toluene molecules involves the interaction through its π electron cloud with the cation and the interaction of the CH group with framework oxygens bearing the negative charge of the lattice [13]. M a n u s c r i p t 20 Therefore, cobalt has two disadvantages to adsorb toluene compared with sodium or cesium.…”

Section: Page 19 Of 41mentioning

confidence: 99%

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Hydrocarbon adsorption and NOx-SCR on (Cs,Co)mordenite

Serra

Aspromonte

Miró

et al. 2015

Applied Catalysis B: Environmental

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“…At elevated temperatures of the entire system, the adsorbed HCs are desorbed and oxidized by the thermally activated TWC. Zeolites are used frequently as the material for the HC trap because of their strong affinity to HCs and high thermal stability …”

Section: Introductionmentioning

confidence: 99%

“Super Hydrocarbon Reformer Trap” for the Complete Oxidation of Toluene Using Iron‐Exchanged β‐Zeolite with a Low Silicon/Aluminum Ratio

et al. 2016

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This study examines the effects of the Si/Al ratio and metal cation exchange of a zeolite on the ability to adsorb and reform unburned hydrocarbons (HCs) in emissions from gasoline vehicles. Iron ion‐exchanged β‐zeolites with a low Si/Al ratio not only trap but also oxidize HCs efficiently, which spurred on the development of a “super HC reformer trap”. Toluene temperature‐programmed desorption experiments in an O2‐containing stream revealed that >90 % of the adsorbed toluene was converted into CO2, and other oxygenates were not observed. This material could be reused and it retained its performance. The strong adsorption of toluene on the zeolites was derived from two synergistic effects: (1) electrostatic interactions between the π orbital of the aromatic ring and the p orbital of the metal cation and (2) interactions between the positively polarized methyl group of toluene and a basic oxygen atom in the zeolite framework. This new material will pave the way for low‐emission, Pt‐free vehicles.

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Experimental and theoretical studies about the adsorption of toluene on ZSM5 and mordenite zeolites modified with Cs

Cited by 57 publications

References 36 publications

Fixed-bed adsorption of toluene on high silica zeolites: experiments and mathematical modelling using LDF approximation and a multisite model

Fixed-bed adsorption of toluene on high silica zeolites: experiments and mathematical modelling using LDF approximation and a multisite model

Hydrocarbon adsorption and NOx-SCR on (Cs,Co)mordenite

“Super Hydrocarbon Reformer Trap” for the Complete Oxidation of Toluene Using Iron‐Exchanged β‐Zeolite with a Low Silicon/Aluminum Ratio

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