Effect of the phase structure on the catalytic activity of MoO3 and potential application for indoor clearance. Issue 7 (22nd January 2020)

• Record Type: Journal Article
• Authors: Sun, Peipei; Teng, Fei; Yang, Zhicheng; Yang, Xiaoman; Zhai, Siyu; Liang, Shuyu; Gu, Wenhao; Hao, Weiyi; Shi, Shaoqian
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 7(2020)
• Page Start: 2475
• Page End: 2482
• Publication Date: 2020-01-22
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc05241k
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : The big Jahn–Teller distortion of α-MoO3 results in a high CWAO activity. Abstract : In this work, α -MoO3 and h-MoO3 are synthesized by a simple hydrothermal method. Under ambient conditions, α-MoO3 has a high catalytic wet air oxidation (CWAO) activity for methylene blue (MB), while h-MoO3 has no activity: 64% of MB can be degraded after 20 min. When adding an additional man-made light source, the performances of h-MoO3 and α-MoO3 remain almost unchanged. However, with elevating the reaction temperature from 25 to 40 °C, the activity has not been improved for h-MoO3, while the activity of α-MoO3 also has no improvement from 25 to 35 °C. When the temperature rises to 40 °C, the performance of α-MoO3 improved significantly: the degradation percentage reaches 90% after 20 min. Crystal structure analysis results show that the activity of α-MoO3 originates from Jahn–Teller distortion of the [MoO6 ] octahedron, resulting in the formation of Lewis acid sites. Furthermore, H2 -temperature programmed reduction (H2 -TPR) and O2 -temperature programmed desorption (O2 -TPD) results indicate that α-MoO3 has a higher lattice oxygen mobility and a higher oxidization ability than h-MoO3 . This ambient CWAO process is energy-saving and low-cost, which is promising for indoor clearance.