The supported 40 wt% (NH4)3HPMo11VO40 (APMV) catalysts over two different types of supports, supports-I (Cs3PMo12O40, Cs2.5H0.5PMo12O40, Cs4PMo11VO40 and Cs3HPMo11VO40) and supports-II (CeO2, WO3/ZrO2 and S-1 molecular sieve), were synthesized by deposition–precipitation method and further evaluated in the partial oxidation of isobutane to methacrylic acid (MAA) at 340 °C under atmospheric pressure. The fresh and used catalysts were characterized by N2 adsorption/desorption, TG/DTG, XRD, FT-IR, Raman spectroscopy, pyridine- adsorption FT-IR and NH3-TPD to investigate their structure, stability and surface acidity. The better results were obtained by impregnating 40 wt% active APMV phase onto the supports-I phase with same/similar Keggin structure, and it is believed that the formation of coherent interfaces between two structural well-matched phases with the same/similar Keggin anions greatly promotes interfacial transfer abilities of electrons and lattice oxygen, which is responsible for the efficient oxygen insertion to maximize MAA selectivity and conversion of isobutane. The current work provides a concept of phase synergy to design a promising catalyst for selective oxidation of isobutane.
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This work was supported by the National Natural Science Foundation of China (Grant No. 21673227), Scientific Group Research Project of Mudanjiang Normal University (No.D211220645), the Science and Technology Innovation Project of Mudanjiang Normal University (No. kjcx2020-16mdjnu).
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Cai, X., Ma, Y., Zhou, Q. et al. Synergistic effects of phases in the selective oxidation of isobutane over supported (NH4)3HPMo11VO40 catalysts. Reac Kinet Mech Cat 133, 293–308 (2021). https://doi.org/10.1007/s11144-021-01967-0