Preparation and Characterization of Amine-Terminated Delafossite Type Oxide, Cumno2-Nh2, Supported Pd (0) Nanoparticles for the H2 Generation From the Methanolysis of Ammonia-Borane

Abstract

Among 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 degrees 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. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.