n-Butane, iso-Butane and 1-Butene Adsorption on Imidazolium-Based Ionic Liquids Studied with Molecular Beam Techniques

Winter L, Bhuin RG, Maier F, Steinrück HP (2021)

Publication Type: Journal article

Publication year: 2021

Journal

DOI: 10.1002/chem.202102492

Abstract

The interaction of molecules, especially hydrocarbons, at the gas/ionic liquid (IL) surface plays a crucial role in supported IL catalysis. The dynamics of this process is investigated by measuring the trapping probabilities of n-butane, iso-butane and 1-butene on a set of frozen 1-alkyl-3-methylimidazolium-based ILs [CnC1Im]X, where n=4, 8 and X⁻=Cl⁻, Br⁻, [PF6]⁻ and [Tf2N]⁻. The decrease of the initial trapping probability with increasing surface temperature is used to determine the desorption energy of the hydrocarbons at the IL surfaces. It increases with increasing alkyl chain length n and decreasing anion size for the ILs studied. We attribute these effects to different degrees of alkyl chain surface enrichment, while interactions between the adsorbate and the anion do not play a significant role. The adsorption energy also depends on the adsorbing molecule: It decreases in the order n-butane>1-butene>iso-butane, which can be explained by different dispersion interactions.

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How to cite

APA:

Winter, L., Bhuin, R.G., Maier, F., & Steinrück, H.-P. (2021). n-Butane, iso-Butane and 1-Butene Adsorption on Imidazolium-Based Ionic Liquids Studied with Molecular Beam Techniques. Chemistry - A European Journal. https://doi.org/10.1002/chem.202102492

MLA:

Winter, Leonhard, et al. "n-Butane, iso-Butane and 1-Butene Adsorption on Imidazolium-Based Ionic Liquids Studied with Molecular Beam Techniques." Chemistry - A European Journal (2021).

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