Determination of proton affinity of zeolites and zeolite-like solids by low-temperature adsorption of carbon monoxide

Ludmila Kubelková; Stanislav Beran; Johannes A. Lercher

doi:10.1016/0144-2449(89)90052-3

Determination of proton affinity of zeolites and zeolite-like solids by low-temperature adsorption of carbon monoxide

Ludmila Kubelková, Stanislav Beran, Johannes A. Lercher

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

124 Scopus citations

Abstract

The i.r. spectra of HNaY, HAIY, and HZSM-5 zeolites and AlPO₄-5 and SAPO-5 phosphates interacting with CO are used to characterize hydroxyl acid strength. The interpretation of observed effects is based on the quantum-chemical calculation of model clusters. It was found that the shift in the stretching vibration frequency of OH groups caused by the adsorption of CO varies between 90 and 332 cm^-1 (corresponding to the proton affinity values of 1139-1390 kj mol^-1) and increases in the sequence SiOH < AlOH ≤ POH < SiOHAl. The acid-strength heterogeneity of bridging SiOHAl groups causes mainly the variation of their vibrational shift with increasing CO coverage. The influence of neutral alumina-like nonskeletal species on the acid strength of bridging hydroxyls is also discussed, and method of CO adsorption is compared with thermal decomposition of pyridinium ions.

Original language	English
Pages (from-to)	539-543
Number of pages	5
Journal	Zeolites
Volume	9
Issue number	6
DOIs	https://doi.org/10.1016/0144-2449(89)90052-3
State	Published - Nov 1989
Externally published	Yes

Keywords

AlPO
CO adsorption
OH acid-strength
SAPO
Zeolites

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10.1016/0144-2449(89)90052-3

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title = "Determination of proton affinity of zeolites and zeolite-like solids by low-temperature adsorption of carbon monoxide",

abstract = "The i.r. spectra of HNaY, HAIY, and HZSM-5 zeolites and AlPO4-5 and SAPO-5 phosphates interacting with CO are used to characterize hydroxyl acid strength. The interpretation of observed effects is based on the quantum-chemical calculation of model clusters. It was found that the shift in the stretching vibration frequency of OH groups caused by the adsorption of CO varies between 90 and 332 cm-1 (corresponding to the proton affinity values of 1139-1390 kj mol-1) and increases in the sequence SiOH < AlOH ≤ POH < SiOHAl. The acid-strength heterogeneity of bridging SiOHAl groups causes mainly the variation of their vibrational shift with increasing CO coverage. The influence of neutral alumina-like nonskeletal species on the acid strength of bridging hydroxyls is also discussed, and method of CO adsorption is compared with thermal decomposition of pyridinium ions.",

keywords = "AlPO, CO adsorption, OH acid-strength, SAPO, Zeolites",

author = "Ludmila Kubelkov{\'a} and Stanislav Beran and Lercher, {Johannes A.}",

year = "1989",

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doi = "10.1016/0144-2449(89)90052-3",

language = "English",

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journal = "Zeolites",

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TY - JOUR

T1 - Determination of proton affinity of zeolites and zeolite-like solids by low-temperature adsorption of carbon monoxide

AU - Kubelková, Ludmila

AU - Beran, Stanislav

AU - Lercher, Johannes A.

PY - 1989/11

Y1 - 1989/11

N2 - The i.r. spectra of HNaY, HAIY, and HZSM-5 zeolites and AlPO4-5 and SAPO-5 phosphates interacting with CO are used to characterize hydroxyl acid strength. The interpretation of observed effects is based on the quantum-chemical calculation of model clusters. It was found that the shift in the stretching vibration frequency of OH groups caused by the adsorption of CO varies between 90 and 332 cm-1 (corresponding to the proton affinity values of 1139-1390 kj mol-1) and increases in the sequence SiOH < AlOH ≤ POH < SiOHAl. The acid-strength heterogeneity of bridging SiOHAl groups causes mainly the variation of their vibrational shift with increasing CO coverage. The influence of neutral alumina-like nonskeletal species on the acid strength of bridging hydroxyls is also discussed, and method of CO adsorption is compared with thermal decomposition of pyridinium ions.

AB - The i.r. spectra of HNaY, HAIY, and HZSM-5 zeolites and AlPO4-5 and SAPO-5 phosphates interacting with CO are used to characterize hydroxyl acid strength. The interpretation of observed effects is based on the quantum-chemical calculation of model clusters. It was found that the shift in the stretching vibration frequency of OH groups caused by the adsorption of CO varies between 90 and 332 cm-1 (corresponding to the proton affinity values of 1139-1390 kj mol-1) and increases in the sequence SiOH < AlOH ≤ POH < SiOHAl. The acid-strength heterogeneity of bridging SiOHAl groups causes mainly the variation of their vibrational shift with increasing CO coverage. The influence of neutral alumina-like nonskeletal species on the acid strength of bridging hydroxyls is also discussed, and method of CO adsorption is compared with thermal decomposition of pyridinium ions.

KW - AlPO

KW - CO adsorption

KW - OH acid-strength

KW - SAPO

KW - Zeolites

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U2 - 10.1016/0144-2449(89)90052-3

DO - 10.1016/0144-2449(89)90052-3

M3 - Article

AN - SCOPUS:0024764702

SN - 0144-2449

VL - 9

SP - 539

EP - 543

JO - Zeolites

JF - Zeolites

IS - 6

ER -

Determination of proton affinity of zeolites and zeolite-like solids by low-temperature adsorption of carbon monoxide

Abstract

Keywords

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