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

ACS applied materials & interfaces (2018-03-10)
Maria V Zakharova, Nima Masoumifard, Yimu Hu, Jongho Han, Freddy Kleitz, Frédéric-Georges Fontaine
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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Tri-tert-butylphosphine, 98%
Sigma-Aldrich
2,2,6,6-Tetramethylpiperidine, ≥99%
Sigma-Aldrich
Vinyltrimethoxysilane, 98%
Sigma-Aldrich
Diphenylphosphine, 98%
Sigma-Aldrich
1-Bromo-4-iodobenzene, 98%
Sigma-Aldrich
(3-Iodopropyl)trimethoxysilane, ≥95.0% (GC)
Sigma-Aldrich
Allyl methyl sulfone, 96%