Mo--V--Nb--O-based catalysts for low-temperature selective oxidation of C_α--OH lignin model compounds

Abstract

Mo–V–Nb tri-component oxide catalysts were prepared and firstly used for the selective oxidation of C_α−OH lignin compounds. The catalytic performance of the composite oxides was obviously enhanced due to the synergistic effects of Mo and V elements. Mo_5−xV_xO₁₄ phase with a variable Mo/V ratio provided suitable active sites for the oxidative dehydrogenation (ODH) of C_α−OH lignin model compound. The optimized Mo–V–Nb molar composition was confirmed as Mo_0.61V_0.31Nb_0.08O_x/TiO₂, which exhibited the prominent catalytic activity with the turnover frequency of 1.04×10⁻³ mmol· g(cat)⁻¹·s⁻¹. Even at room temperature, the catalysts showed highly-efficient ODH reaction activities. The active phase for selective oxidation reaction and the inhibiting effect of α-MoO₃ phase were also discussed in the study.

Keywords

selective oxidation / secondary alcohol / lignin model compound / room temperature

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 21676285), the Shandong University of Science and Technology Research Fund (Grant No. 2014TDJH104), the Qingdao Indigenous Innovation Program (Grant No. 15-9-1-76-jch), and the Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents (Grant No. 2017RCJJ015).

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