Preparation and characterization of amine-terminated delafossite type oxide, CuMnO_2-NH_2, supported Pd (0) nanoparticles for the H_2 generation from the methanolysis of ammonia-borane

摘要

? 2022 Hydrogen Energy Publications LLCAmong the cuprous metal oxides of the delafossite type, which are generally formulated as CuMO2 (M = Al, Cr, Fe, Ga, Mn), the most promising is the CuMnO2 structures. CuMnO2 material, named crednerite, is a very interesting delafossite derivative with potential applications in many fields, mainly catalyst, photoelectrochemical cells and multiferroic tools. Herein, we report fabrication, characterization, and application of amine-terminated CuMnO2 (CuMnO2–NH2) supported palladium nanoparticles (Pd/CuMnO2–NH2) as highly efficient and recyclable catalysts for the hydrogen production from the methanolysis of ammonia-borane (AB). The results of characterization using P-XRD, TEM, HRTEM, TEM-EDX, XPS, SEM, SEM-elemental mapping, and ICP-OES disclose that Pd (0) nanoparticles were well spread on the surface of CuMnO2–NH2 with a mean particle size of 3.91 ± 0.33 nm. Pd/CuMnO2–NH2 shows high catalytic activity in the methanolysis of AB with an initial turnover frequency of 146.68 min?1 at 25 ± 0.1 °C which is one of the highest values ever reported for AB methanolysis in the literature. Besides, the extreme stability of Pd/CuMnO2–NH2 takes it a recyclable heterogeneous catalyst in this catalytic conversion.