Investigating trimethylphosphine oxide interactions with Bronsted and Lewis acid sites in zeolites: A comparative solid-state NMR study of wet-phase and gas-phase adsorption techniques

被引：3

作者：

Bornes, Carlos ^{[1
]}

Geraldes, Carlos F. G. C. ^{[2
,3
,4
]}

Rocha, Joao ^{[1
]}

Mafra, Luis ^{[1
]}

机构：

[1] Univ Aveiro, Aveiro Inst Mat, Dept Chem, CICECO, P-3810193 Aveiro, Portugal

[2] Univ Coimbra, Fac Sci & Technol, Dept Life Sci, P-3000393 Coimbra, Portugal

[3] Univ Coimbra, Fac Sci & Technol, Coimbra Chem Ctr, P-3000393 Coimbra, Portugal

[4] CIBIT Coimbra Inst Biomed Imaging & Translat Res, P-3000548 Coimbra, Portugal

来源：

MICROPOROUS AND MESOPOROUS MATERIALS | 2023年 / 360卷

基金：

欧洲研究理事会;

关键词：

Zeolite; Br onsted acid; Probe molecule; Adsorption; Host-guest interaction; P-31; NMR; CHEMICAL-SHIFT; QUANTIFICATION; SPECTROSCOPY; MOLECULES; CATALYSTS; STRENGTH; PROTONS;

D O I：

10.1016/j.micromeso.2023.112666

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

This study examines the differences in using two primary methods for adsorbing trimethylphosphine oxide (TMPO) onto acid catalysts and their influence on the NMR spectra of TMPO-loaded zeolites. The findings show that TMPO molecules interact with both Bronsted and Lewis acid sites, and that the amount of (TMPO)2H+ dimers formed increases with the amount of TMPO added. The use of dichloromethane as a solvent inhibits the formation of dimers and crystalline TMPO but may lead to inaccurate estimations of acid site strength and quantification due to interactions with residual solvent molecules. The gas-phase method is preferred for adsorbing TMPO onto zeolites, but caution is needed to avoid forming a high number of dimers that ca pose challenges in the interpretation of the NMR spectra.

引用

页数：6