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ACS Appl Mater Interfaces. 2018 Apr 18;10(15):13199-13210. doi: 10.1021/acsami.8b00640. Epub 2018 Apr 5.

Designed Synthesis of Mesoporous Solid-Supported Lewis Acid-Base Pairs and Their CO2 Adsorption Behaviors.

Author information

1
Département de Chimie, Centre en Catalyse et Chimie Verte (C3V) , Université Laval , 1045 Avenue de la Médecine , Québec , Quebec G1V 0A6 , Canada.
2
Département de Chimie, Centre de Recherche sur les Matériaux Avancés (CERMA) , Université Laval , Québec , Quebec G1V 0A6 , Canada.
3
Department of Chemistry , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 305-701 , Republic of Korea.
4
Center for Nanomaterials and Chemical Reactions , Institute for Basic Science , Daejeon 305-701 , Republic of Korea.
5
Department of Inorganic Chemistry-Functional Materials, Faculty of Chemistry , University of Vienna , Währinger Str. 42 , 1090 Vienna , Austria.

Abstract

Conventional amines and phosphines, such as diethylenetriamine, diphenylpropylphosphine, triethylamine, and tetramethylpiperidine, were grafted or impregnated on the surface of metalated SBA-15 materials, such as Ti-, Al-, and Zr-SBA-15, to generate air-stable solid-supported Lewis acid-base pairs. The Lewis acidity of the metalated materials before and after the introduction of Lewis bases was verified by means of pyridine adsorption-Fourier transform infrared spectroscopy. Detailed characterization of the materials was achieved by solid-state 13C and 31P MAS NMR spectroscopy, low-temperature N2 physisorption, X-ray photoelectron spectroscopy, and energy-dispersive X-ray mapping analyses. Study of their potential interactions with CO2 was performed using CO2 adsorption isotherm experiments, which provided new insights into their applicability as solid CO2 adsorbents. A correlation between solid-supported Lewis acid-base pair strength and the resulting affinity to CO2 is discussed based on the calculation of isosteric enthalpy of adsorption.

KEYWORDS:

Lewis acid−base pairs; SBA-15; carbon dioxide capture; isosteric enthalpy of adsorption; mesoporous silica; surface functionalization

PMID:
29521092
DOI:
10.1021/acsami.8b00640

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