Oxidative Dehydrogenation of Ethane: Superior Nb
2O
5-NiO/Ni-Foam Catalyst Tailored by Tuning Morphology of NiO-Precursors Grown on a Ni-Foam.
iScience 2019;
20:90-99. [PMID:
31563854 PMCID:
PMC6833484 DOI:
10.1016/j.isci.2019.09.021]
[Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 08/06/2019] [Accepted: 09/12/2019] [Indexed: 12/05/2022] Open
Abstract
Large-scale shale gas exploitation greatly enriches ethane resources, making the oxidative dehydrogenation of ethane to ethylene quite fascinating, but the qualified catalyst with unique combination of enhanced activity/selectivity, enhanced heat transfer, and low pressure drop presents a grand challenge. Herein, a high-performance Nb2O5-NiO/Ni-foam catalyst engineered from nano- to macroscale for this reaction is tailored by finely tuning the performance-relevant Nb2O5-NiO interaction that is strongly dependent on NiO-precursor morphology. Three NiO-precursors of different morphologies (clump, rod, and nanosheet) were directly grown onto Ni-foam followed by Nb2O5 modification to obtain the catalyst products. Notably, the one from the NiO-precursor of nanosheet achieves the highest ethylene yield, in nature, because of markedly diminished unselective oxygen species due to enhanced interaction between Nb2O5 and NiO nanosheet. An advanced catalyst is developed by further thinning the NiO-precursor nanosheet, which achieves 60% conversion with 80% selectivity and is stable for at least 240 h.
A series of Nb2O5-NiO/Ni-foam catalysts are developed for the ODE reaction
Catalysts are obtained by Nb2O5 modification of NiO-precursors grown onto Ni-foam
Thinning NiO-precursors dramatically improves the ethylene selectivity
Non-selective O2- species are markedly reduced with enhanced Nb2O5-NiO interaction
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