Cu–Mn–O nano-particle/nano-sheet spinel-type materials as catalysts in methanol steam reforming (MSR) and preferential oxidation (PROX) reaction for purified hydrogen production. (January 2022)

• Record Type: Journal Article
• Authors: Dasireddy, Venkata D.B.C.; Likozar, Blaž
• Is Part Of: Renewable energy. Volume 182(2022)
• Page Start: 713
• Page End: 724
• Publication Date: 2022-01
• Subjects: Nanocomposite catalysts -- Hydrogen production -- Hydrogen purification -- Preferential oxidation -- Methanol-reforming -- Cu–Mn spinel phase; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2021.10.033
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: Nanocomposite Cu–Mn–O nano-particle (CuMnNP) and nano-sheet (CuMnNS) catalyst were successfully prepared using a one-step hydrothermal method in the absence of any templating reagent. Materials were characterised applying various structural techniques. SEM images showed that composite Cu–Mn oxide sheets were tailor-made synthesised by a one-pot urea-abetted protocol. Conversely, upon replacing carbamate by Na2 CO3, oxidised metal Cu–Mn particles could be obtained. The formation of bulk mixed Cu–Mn phases resulted in an enhanced crystal lattice oxygen reactivity in CuMnNS. XPS, XRD and TPR measurements confirmed the presence of the Cu + and Cu 2+ species in nano-catalysts, and CuMnNS nanomaterials possessed more surface defects, thus causing a higher O2 adsorption/storage capacity. CuMnNS presented a superior catalytic activity as opposed to CuMnNP in the preferential oxidation (PROX) pathway of CO. With both CO2 and H2 O in feed, a decrease in CO turnover was observed, due to a competitive interface binding of CO, CO2 and H2 O. Compared to CuMnNP, CuMnNS also demonstrated a high time-on-stream conversion of methanol for the reforming for all operating conditions. Graphical abstract: Image 1 Highlights: Hydrogen generation and purification by Cu–Mn nanosheets and particles. Preparation of Cu–Mn–O nanocomposite oxide nanosheets and nanoparticles by hydrothermal method. Excellent stability for both CO PROX reaction and Steam reforming of MeOH. Redox cycle between Cu n+ and Mn n+ with Cu1.5 Mn1.5 O4 phase. Cu–Mn nanosheets achieved a high hydrogen formation rate (60 mmol. g −1 h −1 ).