A facile and effective solvothermal method was developed to tailor the morphology and size of Pt nanocrystals by tuning the concentration of 1-octylamine (OAm). Three shaped Pt nanocrystals (NCs), 0D sphere & icosahedra, 2D plate and 3D multipods, were synthesized sequentially with increasing the OAm concentration from 5% to 100% in the solvent mixture OAm and N, N -dimethylformamide (DMF). These Pt NCs exhibited high catalytic performance toward the reduction of p -nitrophenol. The strategy presented in this work open a new avenue for easily developing high dimensional Pt nanocrystals, especially for rare 2D plate.
Shiqing Wang,Xiaocheng Lan,Boyang Liu,Babar Ali,Tiefeng Wang
Graphical Octylamine synthesis : Ni x Fe 1 /Al 2 O 3 was used as catalyst for 1-octanol amination and provided the highest yield among the reported nonprecious metal catalysts. The generation of Ni−FeO x interactions provided sufficient Fe 2+ /Fe 3+ −O 2− sites for the activation of 1-octanol. Meanwhile, the cooperation between Ni site and Lewis acid-base pairs significantly enhanced the amination of 1-octanol to 1-octylamine. The synthesis of 1-octylamine, a primary platform molecule, remained a great challenge in catalysis. In this work, Ni x Fe 1 /Al 2 O 3 was used for direct amination of 1-octanol to 1-octylamine. Catalyst evaluation indicated that the promotion effect of Fe/Ni ratio on the catalytic amination activity followed a volcano curve while the selectivity to 1-octylamine was positively correlated with the Fe loading. Compared with the Ni/Al 2 O 3 catalyst, the amination activity was increased by 2.8 times by optimizing the Fe/Ni ratio to 0.33, and the selectivity to 1-octylamine was increased from 84.0 % to 96.3 % when increasing the Fe/Ni ratio from 0 to 1. Based on catalyst characterizations, the good performance of Ni x Fe 1 /Al 2 O 3 was ascribed to the combined modification effect of the NiFe alloy and Ni−FeO x interface. The FeO x species enriched on the Ni particle surface provided sufficient Fe 2+ /Fe 3+ −O 2− sites for the activation of 1-octanol, and the cooperation between Ni sites and Lewis acid-base pairs enhanced the amination of 1-octanol to 1-octylamine. This work sheds new light on the design of Ni-based catalysts without using a noble metal for primary amine preparation.
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