LAUSR

Abstract Hierarchical SAPO-34 assembled from nanosheets was synthesized via in situ growth at low temperature, and then was served as support to prepare Pt-based catalyst for promoting the dehydrogenation performance of ammonia borane. The prepared Pt/SAPO-34 catalysts were characterized by XRD, ICP, SEM, TEM, XPS, HAADF-STEM, N2 adsorption-desorption and NH3-TPD. Contrary to traditional microporous Pt/SAPO-34-M catalyst, hierarchical Pt/SAPO-34-H catalysts possessed larger surface area to strengthen metal dispersion, which further improved catalytic activity and reusability. At the same time, the increase in SiO2/Al2O3 ratios of Pt/SAPO-34-H under the same metal loading was beneficial for enhancing the catalytic activity. Pt/SAPO-34-H-0.6 with SiO2/Al2O3 ratio of 0.6 showed outstanding catalytic performance and high turnover frequency (TOF) value (131 mo l H 2 ( mo l Pt · min ) − 1 ) at 30 °C on account of the synergistic effect of Bronsted acidic sites and Pt metal dispersion.