Amino-functionalized mesoporous materials used for co2 adsorption

Silvana Borcanescu1, Alexandru Popa1, Danica Bajuk-Bogdanovic2, Ivanka Holclajtner-Antunovic2, Snezana Uskokovic-Markovic3

1 "Coriolan Dragulescu" Institute of Chemistry, 24 Mihai Viteazul Blvd., 300223 Timi.oara, Romania
2 Faculty of Physical Chemistry, University of Belgrade, P.O. Box 47, 11158 Belgrade, Serbia
3 Faculty of Pharmacy, University of Belgrade, P.O. Box 146, 11221 Belgrade, Serbia

Abstract


In this paper CO2 adsorption over SBA-15 and MCM-41 molecular sieves functionalized by grafting technique with 3-aminopropyltriethoxy silane was investigated. Starting from commonly used SBA-15 molecular sieve a different sample named SSBA-15 was synthesized by tetraethyl orthosilicate hydrolysis using P123 block copolymer as surfactant and 1-phenyldecane as expansion agent. The surface of SSBA-15 molecular sieve was modified by two ways synthesis steps: first using (3-Glycidyloxypropyl) trimethoxysilane and second by introduction of ethylene diamine (N2) as an amination agent. The prepared amino-functionalized mesoporous materials were further characterized by different investigation methods: FT-IR spectrometry, X-ray diffraction analysis, SEM-EDX, nitrogen physisorption analysis at 77 K. Adsorption-desorption measurements towards CO2 were investigated using Temperature-Programmed desorption (TPD). In order to find the optimum value of the adsorption desorption process, the influence of temperature in the range of 50-80 C was followed. Using a combination of mass spectrometry and thermogravimetry the resulted gases during the adsorption desorption process of CO2 were identified. Compared to already published literature, the herein reported results of the studied amino functionalized sieves for CO2 adsorption-desorption process are significantly better and can be considered as promising. The best results obtained in case of MCM-41-sil were further investigated by adsorption-desorption cycles.

Keywords


adsorption-desorption cycles; adsorbent efficiency; CO2 adsorption; molecular sieves grafted; temperature influence

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