Influence of doping Mg cation in Fe3O4 lattice on its oxygen storage capacity to use as a catalyst for reducing emissions of a compression ignition engine. (15th July 2020)

• Record Type: Journal Article
• Authors: Sabet Sarvestani, Nasrin; Tabasizadeh, Mohammad; Hossein Abbaspour-Fard, Mohammad; Nayebzadeh, Hamed; Karimi-Maleh, Hassan; Chu Van, Thuy; Jafari, Mohammad; Ristovski, Zoran; Brown, Richard J.
• Is Part Of: Fuel. Volume 272(2020)
• Publication Date: 2020-07-15
• Subjects: Solution combustion method -- Magnesium-iron mixed oxide -- Mg Dopant -- Oxygen storage capacity -- Fe3O4 nanoparticle, Emission; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2020.117728
• Languages: English
• ISSNs: 0016-2361

Abstract

Abstract: Improving oxygen storage capacity (OSC) of metal oxides by doping with metal cations can produce a catalyst with superior properties to improve engine performance and reduce emissions. In this study, Mg cations were incorporated into a ferric oxide lattice to form Mg0.25 Fe2.75 O4 via the solution combustion method. The structure, texture, morphology, and oxygen storage capacity of the samples were deeply investigated. The catalytic activity of Mg0.25 Fe2.75 O4 was finally compared with Fe3 O4 as a reference nanocatalyst in terms of its combustion emissions using a six-cylinder Cummins diesel engine. It was found that the doped catalyst presented high crystallinity containing a mixture of the spinel-type crystal lattice and α-Fe2 O3 structure, which confirms the ability of the solution combustion method for the fabrication of well-crystalline catalysts. The crystalline structure, surface area, and porosities and vacancy of spinel structure of Mg doped catalyst compared to the inverse spinel structure of Fe3 O4 affect OSC of the samples, such that a significant increase in OSC of Fe3 O4 (7941 µmol/g) occurred by loading of Mg cations (8661 µmol/g). Based on the engine emissions results, synthesized nanocatalysts are beneficial for decreasing the hydrocarbon (HC), carbon monoxide (CO), and particle mass (PM1.0 ) emissions. More specifically, the effect of nanocatalysts OSC would be dominated by the impact of increased soot oxidation, leading to PM1.0 reduction.