封面图片
2020年, 第14卷 第6期
(Mehraneh Ghavami, Mostafa Aghbolaghy, Jafar Soltan, Ning Chen, pp. 937‒947)
Volatile organic compounds (VOCs) are among the major sources of air pollution. VOCs in indoor air are released from human activities and a wide variety of materials such as cleaning agents, floorings, paints, surface coatings, and furniture. Using ozone in catalytic oxidation of VOCs is a potential air treatment method with benefits such as decreasing reaction temperature and possibility of using transition metal oxides instead of precious metals.
We studied catalytic ozonation of acetone over a series of alumina supported single and mixed Mn-Co oxides catalysts at room temperature. Alumina acts as a reservoir for acetone and it interacts with acetone to create surface carboxylate intermediates. Surface carboxylates migrate to the metal sites and react with highly active atomic oxygen species produced from ozone decomposition. The intermediates are oxidized on the metal sites to produce CO2 and water.
The addition of lower loading of Co as secondary metal to Mn catalysts improved activity of the catalysts significantly. By augmenting the catalyst with the second metal with lower loading, the local structure and oxidation states are affected. Catalysts having lower oxidation states are more active in transferring electrons to ozone, leading to higher ozone decomposition, and thus enhanced acetone oxidation. [展开] ...
ISSN 2095-0179 (Print)
ISSN 2095-0187 (Online)
CN 11-5981/TQ
Postal Subscription Code 80-969 Formerly Known as Frontiers of Chemical Science and Engineering in China 2018 Impact Factor: 2.809