Quinary metal oxide NiCoMnCeCaOx nanorod as a multifunctional catalyst towards hydrogen production from ethanol steam reforming: Synergistic effect of polymetallic component

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2024-10, Vol.497, p.154646, Article 154646
• Main Authors: Liao, Mingzheng, Qin, Chunrun, Xu, Liujie, Guo, Sihan, Wang, Chao, Li, Yi, Liu, Wei, Song, Qingbin, Chen, Ying, Du, Yanping
• Format: Article
• Language: English
• Subjects: Carbon tolerant; Ethanol steam reforming; Hydrogen Production; Multifunctional effect; Quinary Metal Oxide
• ISSN: 1385-8947
• DOI: 10.1016/j.cej.2024.154646

[Display omitted] •A NiCoMnCeCaOx nanorod with multifunctional catalytic effects was successfully synthesized.•Stable hydrogen production with effective carbon deposition tolerance was achieved.•The mechanism of ethanol reforming over the quinary metal oxide was revealed. Ethanol has been recognized as a preferred hydrogen carrier, while coke deposition is a crucial issue during the typical ethanol steam reforming (ESR) process for hydrogen production, which hinders the catalytic stability. Polymetallic catalyst is a type of promising candidate catalyst owing to its adjustable catalytic performance, whereas its catalytic mechanism has rarely been investigated in detail. In this work, a nanorod-type quinary metal oxide NiCoMnCeCaOx was tactfully designed and synthesized. In the synthesized catalyst, transition metals (Ni, Co) were employed as active components for C-C and C-H bond cracking; oxygen carrier species (Mn, Ce) were exploited to improve the oxygen release capacity and lattice oxygen mobility; and alkali metals (Ca) were designed to enhance H2O absorption and CO2 capture. It was interesting that surface reconstruction was discovered for NiCoMnCeCaOx during the initial stage of ESR, NiCo nanoalloy was self-assembly generated to form a supported-like NiCo/NiCoMnCeCaOx structure, accompanied with the gradually increased H2 production efficiency and stable at 120.5 μmol/s with 99.92 % ethanol conversion after 20th min. The synergistic effect of the polymetallic component and the specific morphological structure of NiCoMnCeCaOx contributed to its outstanding carbon tolerance performance. It achieved efficient H2 production through ethanol dehydration and subsequent deep dehydrogenation. The new composite material (MWCNT@NiCoMnCeCaOx) induced by ESR reaction exhibited specific electrochemical performance. This work attempted to offer certain references for the design of multifunctional catalysts for H2 production.