In situ high-pressure ¹³C/¹H NMR reaction studies of benzyl alcohol oxidation over a Pd/Al₂O₃ catalyst

Abstract

We report in situ high-pressure NMR kinetic studies of catalytic oxidations inside heterogeneous catalysts exploiting distortionless enhancement by polarisation transfer (DEPT) 13C NMR.

NMR relaxation time measurements of solvent effects in an organocatalysed asymmetric aldol reaction over silica SBA-15 supported proline

“…This trend is in agreement with previous findings reported for more traditional metal catalysts. 40 The results in Fig. 2 suggest that the T 1 / T 2 ratio is a useful indicator to differentiate solvents based on strength of surface interactions and that solvents with a preferential interaction with the solid matrix inhibit access of reactants to the active sites.…”

Insights into Substituent Effects of Benzaldehyde Derivatives in a Heterogeneous Organocatalyzed Aldol Reaction

“…As such, a technique that can offer a direct means to observe surface interactions in a heterogeneous environment is undoubtedly useful and informative. In recent years, the application of NMR spectroscopy, [22][23][24] diffusion [25][26][27][28] and relaxation [29][30][31][32] techniques to heterogeneous catalysts has uncovered novel insights, highlighting the important role that transport, adsorption and surface dynamics of reaction species confined within the pore space play in determining catalytic performances.…”