Catalytic oxidation performances of typical oxygenated volatile organic compounds (acetone and acetaldehyde) over MAlO (M = Mn, Co, Ni, Fe) hydrotalcite-derived oxides

• Published in: Catalysis today 2019-05, Vol.327, p.389-397
• Main Authors: Sun, Yonggang, Li, Na, Xing, Xin, Zhang, Xin, Zhang, Zhongshen, Wang, Gang, Cheng, Jie, Hao, Zhengping
• Format: Article
• Language: English
• Subjects: By-product; Catalytic oxidation; Hydrotalcite; OVOCs
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2018.03.002

[Display omitted] •Superior catalytic activity observes for acetone and acetaldehyde oxidation on MnAlO.•Strong reducibility and richly oxygen species contribute to catalytic activity.•Reaction process and by-product formation mechanism is proposed.•Negative effect of H2O vapor for the MnAlO catalytic activity is described. In this study, a series of hydrotalcite-derived oxides MAlO (M = Mn, Co, Ni, Fe) were prepared by calcinating of hydrotalcite for acetone and acetaldehyde total oxidation. Detailed results confirmed that the highest of CO2 yield and the lowest amount of by-product was observed over MnAlO catalyst. In particular, the MnAlO catalyst appeared to have the best catalytic performance for acetone and acetaldehyde oxidation with T100 about 170 °C and 150 °C at a high space velocity, respectively. Catalytic activity was significantly governed by the excellent reducibility (Mn4+/Mn3+) and abundant chemical adsorption oxygen species (Oadsorbe/Olattice) of the catalysts. Besides, acid property of catalysts was beneficial to catalytic oxidation process. Interestingly, the lower amounts of by-product (acetaldehyde) were generated for acetone oxidation over MnAlO than those of other catalysts, it did not influence on the total oxidation of acetone due to its superior catalytic activity, it was investigated and analyzed the reaction mechanism of acetone oxidation and the formation of by-product over MnAlO catalyst, the result confirmed that desorption of reactant molecule and negative effect of water vapor play a vital role in the by-product generation and catalytic performances.