Sphere-Shaped Mn₃O₄ Catalyst with Remarkable Low-Temperature Activity for Methyl–Ethyl–Ketone Combustion

Abstract

Mn 3 O 4 , FeMnO x , and FeO x catalysts synthesized via a solvothermal method were employed for catalytic oxidation of methyl−ethyl−ketone (MEK) at low temperature. Mn 3 O 4 with sphere-like morphology exhibited the highest activity for MEK oxidation, over which MEK was completely oxidized to CO 2 at 200°C, and this result can be comparable to typical noble metal loaded catalysts. The activation energy of MEK over Mn 3 O 4 (30.8 kJ/mol) was much lower than that of FeMnO x (41.5 kJ/mol) and FeO x (47.8 kJ/mol). The dominant planes, surface manganese species ratio, surface-absorbed oxygen, and redox capability played important roles in the catalytic activities of catalysts, while no significant correlation was found between specific surface area and MEK removal efficiency. Mn 3 O 4 showed the highest activity, accounting for abundant oxygen vacancies, low content of surface Mn 4+ and strong reducibility. The oxidation of MEK to CO 2 via an intermediate of diacetyl is a reaction pathway on Mn 3 O 4 catalyst. Due to high efficiency and low cost, sphere-shaped Mn 3 O 4 is a promising catalyst for VOCs abatement.

Facile Synthesis of Highly Efficient Amorphous Mn‐MIL‐100 Catalysts: Formation Mechanism and Structure Changes during Application in CO Oxidation

“…The a-Mn-200 and a-Mn-250c atalysts retained the same functional groups and framework as Mn-MIL-100.F ive peaks at 723, 1350, 1620, 1700, and 3300cm À1 were observed for Mn-MIL-100, a-Mn-200, and a-Mn-250. [24] However, on further increasing the temperature to 350 8C, the bands centered at 723, 1350, 1620, 1700, and 3300 cm À1 decreased, and an ew peak centered at 620 cm À1 was attributedt ot he MÀOb onds of Mn 3 O 4 , [27,28] consistent with the XRD and HRTEM results. The strong absorption observed at 1350 cm À1 was attributed to the symmetric CO 2 stretching of the carboxylate groups.…”

Effect of Crystal Phase of MnO2 with Similar Nanorod‐Shaped Morphology on the Catalytic Performance of Benzene Combustion

“…The transition and rare earth metal oxides (Fe 2 O 3 , MnO 2 [11 ‐ 13] and Co 3 O 4 [14 ‐ 16] ), which show high activity on the VOCs catalytic combustion, are regarded as an alternative to noble‐metal catalysts due to their low price. Manganese oxides (MnO x ), because of variable oxidation states from +2 to +7, are one of the most active oxide catalysts in the abatement of VOCs .…”

Catalytic oxidation of 1,2-dichloroethane over three-dimensional ordered meso-macroporous Co3O4/La0.7Sr0.3Fe0.5Co0.5O3: Destruction route and mechanism

“…1,2-dichloroethane (1,2-DCE), regarded as a representative member of CVOCs, is widely used in diff erent manufacturing processes such as industrial solvent and metal degreaser [3], making great contributions to the ozone layer depletion, photochemical smog and haze [4]. Various control methods, such as adsorption, absorption [5], catalytic oxidation [6] and pyrolysis [7], have been exploited to solve this problem, among which catalytic oxidation is considered to be one of the most promising candidates for CVOCs total elimination ascribed to its high activity, controllable selectivity, and low energy consumption [8].…”