Mesoporous Mn promoted Co 3 O 4 oxides as an efficient and stable catalyst for low temperature oxidation of CO
2017; Elsevier BV; Volume: 71; Linguagem: Inglês
10.1016/j.solidstatesciences.2017.07.006
ISSN1873-3085
AutoresChangxiang Liu, Lei Gong, Runying Dai, Meijuan Lu, Tingting Sun, Qian Liu, Xigen Huang, Zhong Huang,
Tópico(s)Catalysts for Methane Reforming
ResumoMesoporous Mn-doped Co3O4 catalysts were successfully prepared via a dry soft reactive grinding method based on solid state reaction, and their catalytic performances on CO oxidation were evaluated at a high space velocity of 49,500 mL g−1 h−1. A significant promoted effect was observed once the atomic ratios of Mn/(Co+Mn) were lower than 10%, for instance, the temperature for 50% conversion decreased to about −60 °C, showing superior catalytic performance compared to the single metal oxide. Especially, the Mn-promoted Co3O4 catalyst with a Mn/(Co+Mn) molar ratio of 10% could convert 100% CO after 3000 min of time-on-steam without any deactivation at room temperature. As prepared catalysts were characterized by XRD, N2-adsorption/desorption, TEM, H2-TPR, O2-TPD and CO-titration analysis. The significant enhancement of performance for oxidation of CO over Mn-Co-O mixed oxides was associated with the high active oxygen species concentrations formed during the pretreatment in O2 atmosphere.
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