2021
DOI: 10.1021/acs.jpcc.1c02871
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“Hidden” CO2 in Amine-Modified Porous Silicas Enables Full Quantitative NMR Identification of Physi- and Chemisorbed CO2 Species

Abstract: Although spectroscopic investigation of surface chemisorbed CO 2 species has been the focus of most studies, identifying different domains of weakly interacting (physisorbed) CO 2 molecules in confined spaces is less trivial as they are often indistinguishable resorting to (isotropic) NMR chemical shift or vibrational band analyses. Herein, we undertake for the first time a thorough solid-state NMR analysis of CO 2 species physisorbed prior t… Show more

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Cited by 14 publications
(51 citation statements)
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“… 22 , 23 The drawing scheme on the right is a simplified picture of a CO 2 -filled pore of the silica after adsorption, as proposed by our recent work. 31 The different physisorbed species D , E , and F are represented in black, red, and orange colors, respectively. The chemisorbed species are represented by the simplified structures in white.…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“… 22 , 23 The drawing scheme on the right is a simplified picture of a CO 2 -filled pore of the silica after adsorption, as proposed by our recent work. 31 The different physisorbed species D , E , and F are represented in black, red, and orange colors, respectively. The chemisorbed species are represented by the simplified structures in white.…”
Section: Methodsmentioning
confidence: 99%
“…Recently, our group was able to identify, at least, three new physisorbed CO 2 species in SBA-15 mesoporous silica functionalized with a primary amine, 3-aminopropyltriethoxysilane (APTES@SBA-15) combining relaxation and quantitative NMR. 31 …”
Section: Introductionmentioning
confidence: 99%
“…The ex situ MAS approach has been applied to a range of solid-adsorbent materials to study carbon capture modes. A number of studies have explored carbon capture chemistry in amine-functionalised silicas, [20][21][22][23][24][25][26] metal-organic frameworks, 8,27-32 amine-functionalised metal-organic frameworks, 11,13,14,[33][34][35][36] zeolites, [37][38][39][40] polymers, 41 and porous carbons. 42 The disadvantages of the ex situ MAS approach can be partly resolved by the "in situ MAS" approach (Figure 2b).…”
Section: Practical Considerations For Nmr Studies Of Carbon Dioxide C...mentioning
confidence: 99%
“…Solid-state NMR was used by the Sato group to characterize Cs-containing clay nanoparticles for carbon dioxide capture and storage . Mafra and coworkers combined Multi-CP 13 C NMR and 13 C T 1 measurements to separate various absorbed CO 2 species and detect “hidden” physisorbed CO 2 species in amine-modified porous silicas . Estes and coworkers probed the interactions of immobilized Ru complexes with metal oxide supports by 31 P­{ 1 H}­HETCOR for CO 2 hydrogenation .…”
mentioning
confidence: 99%
“…9 Mafra and coworkers combined Multi-CP 13 C NMR and 13 C T 1 measurements to separate various absorbed CO 2 species and detect "hidden" physisorbed CO 2 species in amine-modified porous silicas. 10 Estes and coworkers probed the interactions of immobilized Ru complexes with metal oxide supports by 31 P{ 1 H}HETCOR for CO 2 hydrogenation. 11 The Buntkowsky group used 1D and 2D multinuclear magic-angle spinning (MAS) NMR to monitor the synthesis of the novel Wilkinson's type silica supported polymer catalysts.…”
mentioning
confidence: 99%