 Prof. Hong He’s group has made an important progress in Cu-based small-pore zeolites utilized for NOx catalytic purification. The corresponding results have been published in the journal of the Appl. Catal. B (2020, 266, 118655 and 2020, 264, 118511), Catal. Sci. Tehhnol. (doi.org/10.1039), and Chem. Eng. J. (2020, 388, 124250).  Congratulations to Academician Hong He for winning the National Natural Science Award（second prize）2019!  Prof. Hong He's group got an important achievement in NH3 selective catalytic reduction of NOx (NH3-SCR). The related work “Polymeric vanadyl species determine the low-temperature activity of V-based catalysts for the SCR of NOx with NH3” was published in Science Advances.  At the invitation of academician of National Academy of Engineering and Professor David y. h. Pui of University of Minnesota, academician Hong He, researcher of Center for Eco-Environmental Science of CAS, and chief scientist of Center for Excellence in Regional Atmospheric Environment of CAS, visited University of Minnesota, and made outstanding scholar report (L.M. fingerson / TSI incorporated distinguished structure) in September 2019.  Congratulations to Professor Hong He for his election as a member of the Chinese Academy of Engineering in 2017!  Congratulations to Professor Hong He on the He Liang He li Foundation Science and Technology Innovation Award 2017！  Congratulations to Professor Hong He for winning the National Science and Technology Progress Award (Second Prize) 2014!  Congratulations to Professor Hong He for winning the National Technology Invention Award (Second Prize) 2011!  The 6th International Conference on Environmental Catalysis (6th ICEC) was held at Beijing from September 12 to September 15, 2010. The 6th ICEC received a total 475 submitted abstracts and welcomed 398 active participants came from 26 countries and regions. 133 oral presentations (including 16 keynote lectures) were arranged in 8 sessions. 10 participants from China, Germany, the Netherland, Italy and Turkey won the best posters award.
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Catalytic decomposition of ozone

We have developed a series of Mn-based catalysts for ozone decomposition. At room temperature and space velocity of 600,000 h-1, the catalysts can totally decompose 40 ppm ozone and 100 ppb ozone at relative humidity of 45% and 90%, respectively. The activity and moisture resistance of the catalyst were significantly improved by modification with transition metals or noble metals, and the activity extended to the low temperature range under space velocity of 2,400,000 h-1. Physical and chemical characterization showed that the Mn2+ and Mn3+ (oxygen vacancy) of the catalysts was the active site for ozone decomposition, and its content determined the catalytic activity for ozone decomposition; the deactivation mechanism under different conditions was revealed: in the presence of water vapor, the competitive adsorption of ozone molecules and water molecules led to deactivation of the catalyst; under dry conditions, the oxygen atom did not rapidly desorb and poisoned oxygen vacancies, leading to deactivation of the catalysts. Quantum chemistry calculations revealed the existence of different types of oxygen vacancies in the catalysts, which explained the difference in activity, and pointed the way toward developing highly efficient catalysts. The catalytic materials have been successfully used in personal protective products, air purifiers, fresh air systems and functional coatings, providing technical means for eliminating ozone in semi-enclosed spaces and the atmospheric environment. In the future, the technology can be used to remove the ozone in aircraft cabins, and to decompose low-concentration ozone in the atmosphere environment by coating catalysts on the radiators of motor vehicles or the outer surface of buildings. (Appl. Catal., B, 2017, 201, 503; Environ. Sci. Technol. 2018, 52,12685; Environ. Sci. Technol., 2019, 53, 10871)

The decomposition of ozone and application of the catalysts

Relevant publications

9. Li Yang, Jinzhu Ma*, Xiaotong Li, Changbin Zhang, Hong He, “Enhancing oxygen vacancies of Ce-OMS-2 via optimized hydrothermal conditions to improve ozone decomposition”, Ind. Eng. Chem. Res., 59, (2020) 118-128.

8. Xiaotong Li, Jinzhu Ma*, Changbin Zhang, Runduo Zhang, Hong He, “Detrimental role of residual surface acid ions on ozone decomposition over Ce-modified γ-MnO2 under humid conditions”, J. Environ. Sci., 91 (2020) 43-53.

7. Li Yang, Jinzhu Ma*, Xiaotong Li, Guangzhi He, Changbin Zhang, Hong He, “Tuning the fill percentage in the hydrothermal synthesis process to increase catalyst performance for ozone decomposition”, J. Environ. Sci., 87, (2020) 60-70.

6. Hua Deng, Shunyu Kang, Jinzhu Ma*, Lian Wang, Changbin Zhang, Hong He, “Role of structural defects in MnOx promoted by Ag doping in the catalytic combustion of volatile organic compounds and ambient decomposition of O3”, Environ. Sci. Technol., 53, (2019) 10871-10879.

5. Xiaotong Li, Jinzhu Ma*, Changbin Zhang, Runduo Zhang, Hong He, “Facile synthesis of Ag modified manganese oxide for effective catalytic ozone decomposition”, J. Environ. Sci., 80, (2019), 159-168.

4. Xiaotong Li, Jinzhu Ma*, Li Yang, Guangzhi He, Changbin Zhang, Runduo Zhang, Hong He, “Oxygen vacancies induced by transition metal doping in g‑MnO2 for highly efficient ozone decomposition”, Environ. Sci. Technol., 52, (2018) 12685-12696.

3. Jinzhu Ma, Caixia Wang,Hong He*, “Transition metal doped cryptomelane-type manganese oxide catalysts for ozone decomposition”, Appl. Catal. B, 201, (2017) 503-510.

2. Caixia Wang, Jinzhu Ma*, Fudong Liu, Hong He, Runduo Zhang, “The effects of Mn2+ precursors on the structure and ozone decomposition activity of cryptomelane-type manganese oxide (OMS-2) catalysts”, J. Phys. Chem. C, 119, (2015) 23119-23126.

1. Zhihua Lian, Jinzhu Ma, Hong He*, “Decomposition of high-level ozone under high humidity over Mn-Fe catalyst: The influence of iron precursors”, Catal. Commun., 59, (2015) 156-160.

 
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