Diffusion measurements of hydrocarbons in H-MCM-41 extrudates with pulsed-field gradient nuclear magnetic resonance spectroscopy

Abstract

Hierarchical zeolitic materials are promising catalyst candidates for production of biofuels. Herein, H-MCM-41 catalysts with different concentrations of the silica Bindzil binder (10-50 wt%) were prepared and characterized using pulsed-field...

Ultrafast Nuclear Magnetic Resonance as a Tool to Detect Rapid Chemical Change in Solution

“…NMR relaxation and diffusion experiments can offer additional chemical insight beyond spectroscopic information contained in resonance frequencies. , Such experiments provide detailed information on molecular dynamics with T 1 and T 2 relaxation rates reflecting mainly rotational motion and diffusion coefficients, D , characterizing the stochastic translational motion. These methods are valuable for studying materials including various liquids, polymers, proteins, and more. − Moreover, T 1 , T 2 , and D are sensitive to structural and environmental changes, making it possible to monitor the chemical transformations of the samples under study. The data from these experiments decay exponentially, and the distribution of relaxation times or diffusion coefficients can be determined through an inverse Laplace transform, categorizing these experiments as Laplace NMR.…”