Extended Data Fig. 10: HAADF-STEM images.
From: Rare-earth–platinum alloy nanoparticles in mesoporous zeolite for catalysis
a, Pt/mz. b, PtLa/mz. c, PtSn/alumina. All three samples had uniformly dispersed Pt nanoparticles without any bulky sintered particles. These catalysts were tested for the PDH reaction, as shown in Fig. 2. For the preparation of Pt/mz, Pt(NH3)4(NO3)2 was loaded to mz using the incipient wetness impregnation technique. The Pt precursor-loaded mz was heated under an O2 flow at 350 °C for 2 h (ramping rate, 0.8 °C min−1; flow rate, 500 cm3 min−1 gcat−1) and subsequently treated under a H2 flow at 580 °C for 2 h (ramping rate, 0.3 °C min−1; H2 flow rate, 300 cm3 min−1 gcat−1). The obtained Pt/mz contained 1 wt% Pt. For the preparation of PtSn/alumina, the alumina support was purchased from Sasol (PURALOX γ-Al2O3, 98%, BET surface area of 170 m2 g−1). The alumina was prepared by the same procedure as the Pt/mz except for the co-incorporation of H2PtCl6 and SnCl2·2H2O as metal precursors. The PtSn/alumina contained 1 wt% Pt and 1 wt% Sn.
