Acid-base interaction of probes at silica surface. Microcalorimetry and adsorption

B. Granqvist; G. Hedström; J. B. Rosenholm

doi:10.1016/j.jcis.2009.01.057

Acid-base interaction of probes at silica surface. Microcalorimetry and adsorption

B. Granqvist, G. Hedström, J. B. Rosenholm^*

^*Korresponderande författare för detta arbete

Forskningsoutput: Tidskriftsbidrag › Artikel › Vetenskaplig › Peer review

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Sammanfattning

The interaction of four benzyl derivatives with silica surface sites in anhydrous cyclohexane is investigated. The strength and extent of adsorption is determined from the Langmuir adsorption isotherm. The enthalpy of immersion is determined microcalorimetrically, which is recalculated to the enthalpy of adsorption. The aim is to distinguish between the Lewis-type (electron exchange) and Brønsted-type (proton exchange) of interaction by selecting methanol-acetone and acetic acid-methylamine, respectively as acid-base substituent in benzene. Moreover, the experiments were performed in anhydrous cyclohexane in order to screen out hydrocarbon interactions from the energy balance. The monomolecular adsorption is also distinguished from the bulk wetting of solids. The results are evaluated in terms of possible proton exchange in anhydrous media.

Originalspråk	Engelska
Sidor (från-till)	49-57
Antal sidor	9
Tidskrift	Journal of Colloid and Interface Science
Volym	333
Nummer	1
DOI	https://doi.org/10.1016/j.jcis.2009.01.057
Status	Publicerad - 1 maj 2009
MoE-publikationstyp	A1 Tidskriftsartikel-refererad

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@article{52321b46394f46439a895714a8a0a710,

title = "Acid-base interaction of probes at silica surface. Microcalorimetry and adsorption",

abstract = "The interaction of four benzyl derivatives with silica surface sites in anhydrous cyclohexane is investigated. The strength and extent of adsorption is determined from the Langmuir adsorption isotherm. The enthalpy of immersion is determined microcalorimetrically, which is recalculated to the enthalpy of adsorption. The aim is to distinguish between the Lewis-type (electron exchange) and Br{\o}nsted-type (proton exchange) of interaction by selecting methanol-acetone and acetic acid-methylamine, respectively as acid-base substituent in benzene. Moreover, the experiments were performed in anhydrous cyclohexane in order to screen out hydrocarbon interactions from the energy balance. The monomolecular adsorption is also distinguished from the bulk wetting of solids. The results are evaluated in terms of possible proton exchange in anhydrous media.",

keywords = "Acid-base interaction, Adsorption, Enthalpy of adsorption, Langmuir isotherm, Lewis acid-base, Microcalorimetry, Silica",

author = "B. Granqvist and G. Hedstr{\"o}m and Rosenholm, {J. B.}",

note = "Funding Information: This research has been funded by the Academy of Finland. Osman Hassan is thanked for help with the experiments. Davison Catalysts Grace is thanked for providing the powder.",

year = "2009",

month = may,

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doi = "10.1016/j.jcis.2009.01.057",

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journal = "Journal of Colloid and Interface Science",

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T1 - Acid-base interaction of probes at silica surface. Microcalorimetry and adsorption

AU - Granqvist, B.

AU - Hedström, G.

AU - Rosenholm, J. B.

N1 - Funding Information: This research has been funded by the Academy of Finland. Osman Hassan is thanked for help with the experiments. Davison Catalysts Grace is thanked for providing the powder.

PY - 2009/5/1

Y1 - 2009/5/1

N2 - The interaction of four benzyl derivatives with silica surface sites in anhydrous cyclohexane is investigated. The strength and extent of adsorption is determined from the Langmuir adsorption isotherm. The enthalpy of immersion is determined microcalorimetrically, which is recalculated to the enthalpy of adsorption. The aim is to distinguish between the Lewis-type (electron exchange) and Brønsted-type (proton exchange) of interaction by selecting methanol-acetone and acetic acid-methylamine, respectively as acid-base substituent in benzene. Moreover, the experiments were performed in anhydrous cyclohexane in order to screen out hydrocarbon interactions from the energy balance. The monomolecular adsorption is also distinguished from the bulk wetting of solids. The results are evaluated in terms of possible proton exchange in anhydrous media.

AB - The interaction of four benzyl derivatives with silica surface sites in anhydrous cyclohexane is investigated. The strength and extent of adsorption is determined from the Langmuir adsorption isotherm. The enthalpy of immersion is determined microcalorimetrically, which is recalculated to the enthalpy of adsorption. The aim is to distinguish between the Lewis-type (electron exchange) and Brønsted-type (proton exchange) of interaction by selecting methanol-acetone and acetic acid-methylamine, respectively as acid-base substituent in benzene. Moreover, the experiments were performed in anhydrous cyclohexane in order to screen out hydrocarbon interactions from the energy balance. The monomolecular adsorption is also distinguished from the bulk wetting of solids. The results are evaluated in terms of possible proton exchange in anhydrous media.

KW - Acid-base interaction

KW - Adsorption

KW - Enthalpy of adsorption

KW - Langmuir isotherm

KW - Lewis acid-base

KW - Microcalorimetry

KW - Silica

UR - http://www.scopus.com/inward/record.url?scp=62349119629&partnerID=8YFLogxK

U2 - 10.1016/j.jcis.2009.01.057

DO - 10.1016/j.jcis.2009.01.057

M3 - Article

SN - 0021-9797

VL - 333

SP - 49

EP - 57

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

IS - 1

ER -

Acid-base interaction of probes at silica surface. Microcalorimetry and adsorption

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