Citation: He Ma, Changhua Wang, Songmei Li, Xintong Zhang, Yichun Liu. High-humidity tolerance of porous TiO₂(B) microspheres in photothermal catalytic removal of NO_x[J]. Chinese Journal of Catalysis, ;2020, 41(10): 1622-1632. doi: S1872-2067(19)63508-4 shu

High-humidity tolerance of porous TiO₂(B) microspheres in photothermal catalytic removal of NO_x

Key Laboratory of UV-Emitting Materials and Technology of Chinese Ministry of Education, Northeast Normal University, Changchun 130024, Jilin, China

Received Date: 29 February 2020
Revised Date: 21 March 2020

Fund Project: This work was supported by the National Natural Science Foundation of China (51072032, 51372036, 51102001), the Key Project of Chinese Ministry of Education (113020A), the 111 project (B13013), and Jilin Province Science and Technology Development Plan (20180101175JC).

Semiconductor oxides are widely used to achieve photocatalytic removal of NO_x (NO and NO₂) species. These materials also exhibit enhanced oxidation ability in thermally assisted photocatalysis; however, many of them tend to be deactivated at high relative humidity (RH) levels. In the case of the benchmark P25 TiO₂ photocatalyst, we observe a significant decrease in non-NO₂ selectivity from 95.02% to 58.33% when RH increases from 20% to 80%. Interestingly, the porous TiO₂(B) microspheres synthesized in this work exhibit 99% selectivity at 20% RH; the selectivity remains as high as 96.18% at 80% RH. The high humidity tolerance of the TiO₂(B) sample can be ascribed to its strong water desorption capacity and easy O₂ adsorption at elevated temperatures, which reflects the fact that the superoxide radical is the main active species for the deep oxidation of NO_x. This work may inspire the design of efficient photothermal catalysts with application in NO_x removal in hot and humid environments.
- TiO₂(B),
- Photocatalyst,
- Photothermal catalysis,
- High-humidity tolerance,
- NO degradation
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High-humidity tolerance of porous TiO₂(B) microspheres in photothermal catalytic removal of NO_x