Low-temperature combustion of methane over graphene templated Co3O4 defective-nanoplates

Abstract

Transition metal oxides are the potential catalysts to replace noble-metal based catalyst for the catalytic combustion of methane due to the tolerable reactivity and low cost. However, these catalysts are challenged by the low temperature reactivity. Herein, the surface defective Co3O4 nanoplates are realized through a facile co-precipitation and thermal reduction method with the association of GO. The resultant catalysts (CoGO50) demonstrate a superior low-temperature reactivity for the methane oxidation to CO2 and H2O in comparison with the common Co3O4 catalyst. The reliable stability of CoGO50 catalyst was proved by 80 h testing with intermittent feeding of water vapor. The experimental analysis demonstrates that the presence of a small amount of GO significantly affects the catalysts in surface valence state, active oxygen species and surface oxygen vacancies through reacting with the cobalt oxide as a reductant. Moreover, GO plays as 2D confine template to form smaller and thinner nanoplates. This work provides a facile method to control the surface properties of catalyst not only for Co3O4 based catalysts but also for wider solid catalysts.

Hollow and oval-configured ultrafine Co3O4 as a highly-efficient activator of monopersulfate for catalytic elimination of Azorubin S

“…Co 2+ to Co 0 in the cluster form and bulk form, respectively [31]. This result showed that the reduction temperatures of Co species in HOCO were much lower than that of Co 3 O 4 NP, further illustrating the higher degree of active surface in HOCO compared with Co 3 O 4 NP, which subsequently contribute to different activities during oxidative reactions [32].…”

Recent Advances in Co3O4-Based Composites: Synthesis and Application in Combustion of Methane

“…This compound, akin to a typical cubic spinel structure, presents a face-centered cubic structure accumulation body, with Co 3+ residing at the core of octahedron and CO 2+ residing at the core of tetrahedron. Notably, Co 3 O 4 has a feeble Co–O bond [ 16 , 17 ], resulting in the facile migration of surface oxygen vacancy [ 18 ]. In addition, Co 3 O 4 exhibits a predisposition for oxygen vacancy production even at room temperature [ 3 , 19 , 20 , 21 , 22 , 23 ].…”

N-Butylamine Decomposition over Hierarchical Porous Copper–Manganese Composite Oxides: Overcoming the Limitation Between Activity and N2 Selectivity

“…5,6 As a typical NVOCs, n-butylamine has been widely used as an ingredient in the manufacture of pesticides, pharmaceuticals, and emulsifiers. 7,8 Several terminal control technologies for VOCs have been developed recently, mainly including biological purification, thermal combustion, thermal catalytic oxidation, plasma oxidation, and photocatalytic purification. 9,10 Among them, thermal catalytic oxidation is one of the most promising methods due to its advantage of low energy consumption and high efficiency.…”

“…Nitrogen-containing volatile organic compounds (NVOCs), such as amine, amide, nitrile and nitro compounds, are extensively used in petrochemical, pharmaceutical, rubber, and other industries. − However, NVOCs with high potential toxicity and unpleasant odor can directly cause harm to human health . Moreover, they are also precursors to generate secondary pollutants through atmospheric photochemical reactions. , As a typical NVOCs, n -butylamine has been widely used as an ingredient in the manufacture of pesticides, pharmaceuticals, and emulsifiers. , Several terminal control technologies for VOCs have been developed recently, mainly including biological purification, thermal combustion, thermal catalytic oxidation, plasma oxidation, and photocatalytic purification. , Among them, thermal catalytic oxidation is one of the most promising methods due to its advantage of low energy consumption and high efficiency . However, for n -butylamine catalytic combustion, the production of toxic nitrogen-containing byproducts (e.g., NH 3 and NO x ) is inevitable during the oxidation process. − Moreover, relatively high temperatures (>300 °C) are required for complete mineralization of n -butylamine over most of the reported catalysts which results in excessive consumption of energy.…”