Infrared Spectroscopy Investigation of the Acid Sites in the Metal-Organic Framework Aluminum Trimesate MIL-100(Al)

被引：141

作者：

Volkringer, Christophe ^{[2
]}

Leclerc, Herve ^{[1
]}

Lavalley, Jean-Claude ^{[1
]}

Loiseau, Thierry ^{[2
]}

Ferey, Gerard ^{[2
]}

Daturi, Marco ^{[1
]}

Vimont, Alexandre ^{[1
]}

机构：

[1] Univ Caen Basse Normandie, Catalyse & Spectrochim Lab, ENSICAEN, CNRS, F-14050 Caen, France

[2] Univ Versailles St Quentin Yvelines, Inst Lavoisier, UMR CNRS 8180, F-78035 Versailles, France

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 09期

关键词：

CRYSTAL-STRUCTURE; VIBRATIONAL SPECTROSCOPY; ADSORBED MOLECULES; SURFACE-ACIDITY; POROUS SOLIDS; CO ADSORPTION; CARBOXYLATE; PYRIDINE; WATER; PYROMELLITATE;

D O I：

10.1021/jp210671t

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Infrared spectra of MIL-100(Al) have been recorded after evacuation from room temperature up to 623 K. In addition to adsorbed water molecules characterized by specific (nu+delta)H2O combination bands at about 5300 cm(-1), spectra analysis shows the presence of impurities like carboxylic acid and nitrates resulting from the synthesis step, explaining the low amount of Al-OH groups detected. The Lewis acidity has been characterized by CO [nu(CO) at 2183 cm(-1), pyridine [nu 8a band estimated at 1618 cm(-1)], and CD3CN [nu(CM) at 2326 cm(-1)] adsorption on the activated sample. The acidity is strong as revealed by the nu(CN) wavenumber. Interestingly, CO gives rise to an interaction weaker than that expected from pyridine and CD3CN results. Quantitative results relative to the number of Al-5c(3), sites are in full agreement with those reported elsewhere from Al-27 NMR experiments. The Bronsted acidity mainly results from the presence of coordinated water species in the nonfully dehydrated sample and not from the structural Al-OH groups.

引用

页码：5710 / 5719

页数：10

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