Li Na, Huang Bin, Dong Xue, Luo Jinsong, Wang Yi, Wang Hui, Miao Dengyun, Pan Yang, Jiao Feng, Xiao Jianping, Qu Zhenping
Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China.
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China.
Nat Commun. 2022 Apr 22;13(1):2209. doi: 10.1038/s41467-022-29936-8.
Bifunctional catalysts with tandem processes have achieved great success in a wide range of important catalytic processes, however, this concept has hardly been applied in the elimination of volatile organic compounds. Herein, we designed a tandem bifunctional Zeolites-Silver catalyst that enormously boosted formaldehyde oxidation at low temperatures, and formaldehyde conversion increased by 50 times (100% versus 2%) at 70 °C compared to that of monofunctional supported silver catalyst. This is enabled by designing a bifunctional catalyst composed of acidic ZSM-5 zeolite and silver component, which provides two types of active sites with complementary functions. Detached acidic ZSM-5 activates formaldehyde to generate gaseous intermediates of methyl formate, which is more easily oxidized by subsequent silver component. We anticipate that the findings here will open up a new avenue for the development of formaldehyde oxidation technologies, and also provide guidance for designing efficient catalysts in a series of oxidation reactions.
具有串联过程的双功能催化剂在广泛的重要催化过程中取得了巨大成功，然而，这一概念在挥发性有机化合物的消除方面几乎未得到应用。在此，我们设计了一种串联双功能沸石 - 银催化剂，它极大地促进了低温下的甲醛氧化，与单功能负载银催化剂相比，在70°C时甲醛转化率提高了50倍（从2%提高到1）。这是通过设计一种由酸性ZSM - 5沸石和银组分组成的双功能催化剂实现的，该催化剂提供了两种具有互补功能的活性位点。分离的酸性ZSM - 5使甲醛活化生成甲酸甲酯气态中间体，其更容易被后续的银组分氧化。我们预计，这里的发现将为甲醛氧化技术的发展开辟一条新途径，也为一系列氧化反应中高效催化剂的设计提供指导。
