Analyzing the Effect of Zr, W, and V Isomorph Framework Substitution on ZSM-5 and Beta Zeolites for Their Use as Hydrocarbon Trap

This work evaluates the effect on the adsorption and desorption kinetics of propene and toluene (used as probe molecules for vehicle cold-start emissions) of the isomorph framework substitution of Zr, W, and V on commercial ZSM-5 and beta zeolites. TG-DTA and XRD characterization data indicated that...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2023-06, Vol.28 (12), p.4729
Main Authors: Gil-Muñoz, Gema, Alcañiz-Monge, Juan, Illán-Gómez, María José
Format: Article
Language:English
Subjects:
Acidity
Adsorption
Aging
Carbon dioxide
Cold
Cold starts
Diesel motor
Differential thermal analysis
Emissions
hydrocarbon traps
Hydrocarbons
isomorph framework substitution
Kinetics
Microporosity
Porosity
Somatotropin
Substitutes
Temperature
Toluene
Transportation equipment industry
zeolite
Zeolites
Zirconium
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Summary:This work evaluates the effect on the adsorption and desorption kinetics of propene and toluene (used as probe molecules for vehicle cold-start emissions) of the isomorph framework substitution of Zr, W, and V on commercial ZSM-5 and beta zeolites. TG-DTA and XRD characterization data indicated that: (i) Zr does not modify the crystalline structure of the parent zeolites, (ii) W develops a new crystalline phase, and (iii) V causes the breakdown of the zeolite structure during the aging step. The CO and N adsorption data revealed that the substituted zeolites present a narrower microporosity than pristine zeolites. As a consequence of all these modifications, the modified zeolites feature different adsorption capacity and kinetics of HCs, so, different hydrocarbon trapping ability than pristine zeolites. However, a clear correlation is not observed between the changes in the porosity/acidity of zeolites and the adsorption capacity and kinetics, which depends on: (i) the zeolite (ZSM-5 or BEA), (ii) the hydrocarbon (toluene or propene), and (iii) the cation to be inserted (Zr, W, or V).
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules28124729