In situ CF MAS NMR study of the pairwise incorporation of parahydrogen into olefins on rhodium-containing zeolites Y

► Parahydrogen-induced polarization (PHIP) caused by hydrogenation of olefins was observed. ► Hyperpolarized alkanes were formed on rhodium-containing zeolites Y. ► Antiphase signals evidence the pairwise incorporation of parahydrogen into olefins. ► PHIP effect was studied by in situ continuous-flow 1H MAS NMR spectroscopy.