Contribution of Ca and V to enhancing coking-resistance and stability of MoV/CaO-intercalated montmorillonite catalyst in deoxydehydration of glycerol

• Published in: Applied catalysis. A, General General, 2023-09, Vol.665, p.119355, Article 119355
• Main Authors: Li, Cheng Cang, Li, Da Jian, Yin, Shu Tian, Wang, Ze Zhen, Liu, Chen Lan, Zhou, Chun Hui
• Format: Article
• Language: English
• Subjects: Allyl alcohol; Coking-resistance; Deoxydehydration; Glycerol; Molybdenum-vanadium; Montmorillonite
• ISSN: 0926-860X; 1873-3875
• DOI: 10.1016/j.apcata.2023.119355

Glycerol can be converted to allyl alcohol via deoxydehydration using molybdenum-vanadium, rhenium and iron based catalysts. However, the dehydration causes severe coking at strong acid sites on the surface of catalyst. Molybdenum-vanadium oxide supported on calcium oxide-intercalated montmorillonite (MoV-CaMMT) was prepared by oxalate anion intercalation followed by impregnation. MoV-CaMMT displayed the best catalytic performance of 86.5% glycerol conversion and good stability in 5 h. Correlating the results of XRD, XPS and TG analysis, it can be demonstrated that the addition of CaO in the catalyst preparation is conducive to the crystallization and dispersion of vanadium oxides, and reduces the acid strength, while the presence of a few vanadium dioxide and the stable conversion of V4+ and V5+ are the reasons for enhancing coking-resistance of MoV-CaMMT. Additionally, NH3-TPD analysis proved the coexistence of weak and strong acid sites in MoVOx, which are conducive to the formation of acetol. [Display omitted] •Coking resistance catalyst was prepared by CaO intercalated method and impregnation.•Basic sites promotes the dehydration or deoxydehydration of glycerol to alcohols.•CaO in the catalyst preparation is conducive to the crystallization and dispersion of vanadium oxide.•CaO improves the coking resistance of Mo/V catalyst.•MoOx created new active sites in the weak and strong acid sites of the catalyst.