Integral Intensity of the EPR Signal of NO Molecules Adsorbed on Lewis Acid Sites of Oxide Systems as a Function of Surface Coverage

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Integral Intensity of the EPR Signal of NO Molecules Adsorbed on Lewis Acid Sites of Oxide Systems as a Function of Surface Coverage. / Shubin, Aleksandr A.; Volodin, Alexander M.

In: Applied Magnetic Resonance, Vol. 51, No. 9-10, 01.10.2020, p. 993-1003.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{76b1d3b431e94008bf5288158656f7cc,

title = "Integral Intensity of the EPR Signal of NO Molecules Adsorbed on Lewis Acid Sites of Oxide Systems as a Function of Surface Coverage",

abstract = "A simple model is proposed that semi-quantitatively explains the dependence of the EPR signal intensity of adsorbed NO molecules on the adsorption value. It is assumed that there are only two types of NO adsorption sites on each facet of the microcrystal, such that only NO molecules adsorbed on one of them are active in EPR. Within the framework of this model of lattice adsorption, it is assumed that there are Z other adsorption centers from the set under consideration that are available for the adsorption of neighboring NO molecules in the local environment of each EPR-active adsorption center. In this case, the formation of diamagnetic (NO)2 dimers containing an NO molecule adsorbed on a center active in the EPR decreases the integral intensity of the EPR signal. Analytical expressions are obtained for the dependence of the EPR signal intensity on the surface coverage. They were used to analyze experimental data on the adsorption of NO at the Lewis acid sites of sulfated zirconia. The proposed model consistently explains the results of EPR experiments.",

keywords = "ELECTRON-SPIN-RESONANCE, NITRIC-OXIDE, ADSORPTION, ZEOLITES, ESR, COMPLEXES, SPECTRA",

author = "Shubin, {Aleksandr A.} and Volodin, {Alexander M.}",

year = "2020",

month = oct,

day = "1",

doi = "10.1007/s00723-020-01250-w",

language = "English",

volume = "51",

pages = "993--1003",

journal = "Applied Magnetic Resonance",

issn = "0937-9347",

publisher = "Springer-Verlag GmbH and Co. KG",

number = "9-10",

}

RIS

TY - JOUR

T1 - Integral Intensity of the EPR Signal of NO Molecules Adsorbed on Lewis Acid Sites of Oxide Systems as a Function of Surface Coverage

AU - Shubin, Aleksandr A.

AU - Volodin, Alexander M.

PY - 2020/10/1

Y1 - 2020/10/1

N2 - A simple model is proposed that semi-quantitatively explains the dependence of the EPR signal intensity of adsorbed NO molecules on the adsorption value. It is assumed that there are only two types of NO adsorption sites on each facet of the microcrystal, such that only NO molecules adsorbed on one of them are active in EPR. Within the framework of this model of lattice adsorption, it is assumed that there are Z other adsorption centers from the set under consideration that are available for the adsorption of neighboring NO molecules in the local environment of each EPR-active adsorption center. In this case, the formation of diamagnetic (NO)2 dimers containing an NO molecule adsorbed on a center active in the EPR decreases the integral intensity of the EPR signal. Analytical expressions are obtained for the dependence of the EPR signal intensity on the surface coverage. They were used to analyze experimental data on the adsorption of NO at the Lewis acid sites of sulfated zirconia. The proposed model consistently explains the results of EPR experiments.

AB - A simple model is proposed that semi-quantitatively explains the dependence of the EPR signal intensity of adsorbed NO molecules on the adsorption value. It is assumed that there are only two types of NO adsorption sites on each facet of the microcrystal, such that only NO molecules adsorbed on one of them are active in EPR. Within the framework of this model of lattice adsorption, it is assumed that there are Z other adsorption centers from the set under consideration that are available for the adsorption of neighboring NO molecules in the local environment of each EPR-active adsorption center. In this case, the formation of diamagnetic (NO)2 dimers containing an NO molecule adsorbed on a center active in the EPR decreases the integral intensity of the EPR signal. Analytical expressions are obtained for the dependence of the EPR signal intensity on the surface coverage. They were used to analyze experimental data on the adsorption of NO at the Lewis acid sites of sulfated zirconia. The proposed model consistently explains the results of EPR experiments.

KW - ELECTRON-SPIN-RESONANCE

KW - NITRIC-OXIDE

KW - ADSORPTION

KW - ZEOLITES

KW - ESR

KW - COMPLEXES

KW - SPECTRA

UR - http://www.scopus.com/inward/record.url?scp=85091161586&partnerID=8YFLogxK

U2 - 10.1007/s00723-020-01250-w

DO - 10.1007/s00723-020-01250-w

M3 - Article

AN - SCOPUS:85091161586

VL - 51

SP - 993

EP - 1003

JO - Applied Magnetic Resonance

JF - Applied Magnetic Resonance

SN - 0937-9347

IS - 9-10

ER -

ID: 25687609