2015
DOI: 10.1039/c5cp02436f
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Determining adsorbate configuration on alumina surfaces with 13C nuclear magnetic resonance relaxation time analysis

Abstract: Relative strengths of surface interaction for individual carbon atoms in acyclic and cyclic hydrocarbons adsorbed on alumina surfaces are determined using chemically resolved (13)C nuclear magnetic resonance (NMR) T1 relaxation times. The ratio of relaxation times for the adsorbed atoms T1,ads to the bulk liquid relaxation time T1,bulk provides an indication of the mobility of the atom. Hence a low T1,ads/T1,bulk ratio indicates a stronger surface interaction. The carbon atoms associated with unsaturated bonds… Show more

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Cited by 8 publications
(5 citation statements)
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“…In particular, the NMR observable of interest is the spin relaxation, that can be used as a sensitive probe for molecular dynamics. Relaxation times are the longitudinal relaxation time (T1) and the transverse relaxation time (T2), and they may be used to identify molecular dynamics processes since they both depend on the rotational correlation time of the reactant [30] . Indeed, reduced T1 and T2 relaxation times are observed when liquid molecules adsorb on a solid surface due to a decrease in molecular mobility [31] .…”
Section: Resultsmentioning
confidence: 99%
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“…In particular, the NMR observable of interest is the spin relaxation, that can be used as a sensitive probe for molecular dynamics. Relaxation times are the longitudinal relaxation time (T1) and the transverse relaxation time (T2), and they may be used to identify molecular dynamics processes since they both depend on the rotational correlation time of the reactant [30] . Indeed, reduced T1 and T2 relaxation times are observed when liquid molecules adsorb on a solid surface due to a decrease in molecular mobility [31] .…”
Section: Resultsmentioning
confidence: 99%
“…Relaxation times are the longitudinal relaxation time (T1) and the transverse relaxation time (T2), and they may be used to identify molecular dynamics processes since they both depend on the rotational correlation time of the reactant. [30] Indeed, reduced T1 and T2 relaxation times are observed when liquid molecules adsorb on a solid surface due to a decrease in molecular mobility. [31] Using in particular 13 C NMR, T1 by its own can be a suitable probe for surface interactions, because the relatively slow molecular motion of the adsorbate on the adsorbent surface causes a decrease in T1 compared to its bulk phase.…”
Section: Study Of the Interaction Of Substrates And Catalyst Surface ...mentioning
confidence: 99%
“…As a lower T1 ads /T1 bulk ratio indicates a stronger benzaldehyde adsorption [ 15 ], the mean adsorption energy is mostly higher on the Pd-supported catalyst than on bare carbon ( Table 4 ), due to the stronger adsorption of benzaldehyde, possibly due to the presence of Pd NPs acting as binding sites. Moreover, looking at the T1 values of the individual carbon atoms on Pd/GNP, we were able to identify the specific adsorption mode of benzaldehyde.…”
Section: Resultsmentioning
confidence: 99%
“…Moreover, as reported by Gladden et al [ 15 ], in 13 C NMR the longitudinal relaxation time T1 by its own can be a suitable probe for surface interactions, omitting the use of T2 which is more likely to suffer from resolution issues. The relatively slow molecular motion of the adsorbate on the adsorbent surface causes a decrease in T1 compared to its bulk phase.…”
Section: Introductionmentioning
confidence: 99%
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