Efficient catalyzed oxidation of CO by highly dispersed Co3O4 anchored in oxygen vacancies of Ta2O5.

• Ta 2 O 5 with rich oxygen vacancies was synthesized by hydrothermal method. • Co 3 O 4 anchored in oxygen vacancies formed highly dispersion Co 3 O 4 /Ta 2 O 5. • Co 3 O 4 /Ta 2 O 5 exhibited the good CO conversion, and the temperature of 90% CO conversion was approximately 150 ℃ at the high space velocity of 156,000 h-1. To solve the problem of uneven dispersion of catalysts, Ta 2 O 5 with oxygen vacancy was introduced for CO conversion. In this work, cobalt was anchored in oxygen vacancies of Ta 2 O 5 to form highly dispersion Co 3 O 4 /Ta 2 O 5. The characteristics results of XRD, SEM, BET, TGA, ESR and H 2 -TPR show that cobalt was anchored in oxygen vacancies forming high dispersion Co 3 O 4 /Ta 2 O 5 and a strong interaction between Co 3 O 4 and Ta 2 O 5. The CO conversion was tested at 150 ℃ and resulted in a 90% conversion rate, which is significantly higher than that of pure Co 3 O 4 and Ta 2 O 5. The main mechanism of Co 3 O 4 /Ta 2 O 5 contributed to CO conversion was investigated by XPS and In-situ DRIFTs, revealing that Co3+ and activated oxygen play a vital role in CO conversion. [Display omitted] [ABSTRACT FROM AUTHOR]