 |
FIG. 1 Schematic diagram of the chemical titration process of the carbonyl (a), hydroxyl (b), and carboxyl groups (c) on the carbon nanotube surface.
Fig. 2 Schematic diagram of the comparison of the activity of oxidative dehydrogenation of ethylbenzene catalyzed by carbon nanotubes and their titration derivatives (a); the dependence of the oxidative dehydrogenation activity of carbon nanotubes on the concentration of surface carbonyl groups (b).
Nano-carbon materials have shown great potential as catalysts due to their high reactivity, selectivity toward olefin products, and long-term stability during oxidative dehydrogenation reactions. As a sustainable and eco-friendly alternative to traditional metal-based catalysts, they can be directly used in the conversion of alkanes and other related chemical processes. In recent years, significant progress has been made in the development of new nano-carbon catalysts and innovative catalytic systems, marking a major breakthrough in this field.
However, one of the main challenges remains the lack of advanced methods for characterizing the surface structure of nano-carbons, particularly in-situ techniques. This limitation has hindered the understanding of key aspects such as the types and number of active sites, as well as the intrinsic catalytic activity of these materials. A deeper molecular-level understanding of the catalytic mechanism is essential for further advancements in this area.
Since 2007, a research team led by Dr. Su Dangsheng from the Department of Catalysis Materials at the National (Joint) Laboratory of Materials Science, Chinese Academy of Sciences, has been actively exploring non-metallic nano-carbon catalysis. Their work has resulted in several important discoveries published in top-tier journals, including *Science* and *Angewandte Chemie International Edition*.
In response to the challenges of quantifying active sites on nano-carbon surfaces, Dr. Su and his colleague Dr. Wei Qi developed a novel chemical titration method to accurately measure the surface concentration of oxygen-containing functional groups on carbon nanotubes. As shown in Figure 1, compounds like benzoquinone, benzoic anhydride, and 2-bromoacetophenone can selectively react with specific functional groups, enabling precise quantification through structural analysis.
Figure 2 illustrates how the catalytic performance of various carbon nanotube derivatives was compared in the oxidative dehydrogenation of ethylbenzene. The results demonstrated that ketone groups are the primary active sites for catalytic reactions. This finding was published in *Angewandte Chemie International Edition*, highlighting the importance of this technique in understanding nano-carbon catalysis.
The proposed titration method offers a more objective approach compared to traditional techniques like temperature-programmed desorption or XPS, which often involve subjective interpretations. It allows for accurate measurement of oxygen-containing groups and enables the calculation of TOF values for alkane oxidation, providing a reliable basis for comparing different catalysts and studying reaction mechanisms.
This research was supported by the National Basic Research Program “973†Project (Grant No. 2011CBA00504) and the National Natural Science Foundation of China (Grant No. 21303226). These findings represent a significant step forward in the field of nano-carbon catalysis and open up new possibilities for future applications in green chemistry and sustainable energy.
SMT Special Splice Tape, black anti-static splice tape with diagonal triangle design, pass the feeder easily.
SMT special splice tape Features:
1.Color:Yellow,Blue,Black.
2.For both paper and plastic carrier tapes
3.Economical splicing solution
4.High efficiency joining is accomplished without cutting off the machine
5.The SMT Machine can increase output by 10%-25%.
SMT Special Splice Tape,Yellow SMT Special Splice Tape,SMT Special Black Splice Tape,Special SMT Splice Tape
ShenZhen KDW Electronics Co.,Ltd , https://www.smtsplicetape.com