Paramagnetic relaxation enhancement solid-state NMR studies of heterogeneous catalytic reaction over HY zeolite using natural abundance reactant

- Longitudinal relaxation rates are significantly enhanced upon Cu2+ doping.
- PRE ssNMR technique facilitates the fast acquisition of NMR signals.
- PRE ssNMR is used to monitor catalytic reaction process using n.a. reactant.

Paramagnetic relaxation enhancement solid-state NMR (PRE ssNMR) technique was used to investigate catalytic reaction over zeolite HY. After introducing paramagnetic Cu(II) ions into the zeolite, the enhancement of longitudinal relaxation rates of nearby nuclei, i.e. 29Si of the framework and 13C of the absorbents, was measured. It was demonstrated that the PRE ssNMR technique facilitated the fast acquisition of NMR signals to monitor the heterogeneous catalytic reaction (such as acetone to hydrocarbon) using natural abundance reactants.