Spectroscopic Characterization of Adsorbed 13CO2 on 3-Aminopropylsilyl-Modified SBA15 Mesoporous Silica

Chia Hsin Chen, Daphna Shimon, Jason J. Lee, Stephanie A. Didas, Anil K. Mehta, Carsten Sievers, Christopher W. Jones, Sophia E. Hayes*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

Multiple chemisorption products are found from the interaction of CO2 with the solid-amine sorbent, 3-aminopropyl silane (APS), bound to mesoporous silica (SBA15) using solid-state NMR and FTIR spectroscopy. We employed a combination of both 15N{13C} rotational-echo double-resonance (REDOR) NMR and 13C{15N} REDOR to determine the chemical identity of these products. 15N{13C} REDOR measurements are consistent with a single 13C-15N pair and distance of 1.45 Å. In contrast, both 13C{15N} REDOR and 13C CPMAS are consistent with multiple 13C products. 13C CPMAS shows two neighboring resonances, whose chemical shifts are consistent with carbamate (at 165 ppm) and carbamic acid. The 13C{15N} REDOR experiments resonant at 165 ppm show an incomplete buildup of the REDOR data to ∼90% of the expected maximum. We conclude this 10% missing intensity corresponds to a 13C NMR species that resonates at the identical chemical shift but that is not in dipolar contact with 15N. These data are consistent with the presence of bicarbonate, HCO3-, since it is commonly observed at ∼165 ppm and lacks 15N for dipolar coupling.

Original languageAmerican English
Pages (from-to)6553-6559
Number of pages7
JournalEnvironmental Science and Technology
Volume51
Issue number11
DOIs
StatePublished - 6 Jun 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.

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