Fig. 1: Characterizations of In/H-ZSM-5 catalyst.
From: Confining platinum clusters in indium-modified ZSM-5 zeolite to promote propane dehydrogenation
a In-situ DRIFTS spectra collected during reduction of In/H-ZSM-5: (i) dehydrated at 550 °C; (ii) reduced by 10 vol. % H2/He at 550 °C; (iii) spectrum (i) subtracted from the spectrum (ii). b Pyridine-FTIR spectra of H-ZSM-5 and In/H-ZSM-5 with calcined and reduced conditions. The calcined sample was dehydrated at 550 °C before cooling to 150 °C for pyridine adsorption. The reduced condition represented that the sample was reduced at 550 °C before cooling to 150 °C for pyridine adsorption. c In-situ In K-edge XANES and (d) Fourier-transformed EXAFS spectra over In/H-ZSM-5 with fresh and reduced conditions. The fresh catalyst referred to the calcined sample measured at room temperature. The reduced condition represented that the sample was reduced at 550 °C. The reduced + oxidized condition represented the sample was reduced at 550 °C and then oxidized by exposing the reduced indium species to the ambient atmosphere. In foil and In2O3 were also measured as standards for reference. e Schematic of the reduction and subsequent oxidation of In/H-ZSM-5 catalyst.
