New progress in research on kinetics and mechanism of carbon catalytic reaction in Qiwei group, Institute of metals, Chinese Academy of Sciences

Using renewable carbon based materials instead of metal based catalyst materials to meet the strict requirements of modern society for the green, environmental protection and sustainable development of chemical industry has become one of the new hot research directions in the field of chemistry, chemical industry and materials, and the understanding of the nature of nano carbon catalytic reaction mechanism has always been one of the difficulties in this field Recently, Qi Wei research team of Catalytic Materials Research Department of Metal Research Institute of Chinese Academy of Sciences published a review paper in acc chem Res (DOI: 10.1021 / accounts Accounts 7b00475), systematically summarizing the research work on the mechanism of oxidative dehydrogenation of alkanes over the past five years The qualitative and quantitative analysis of the catalytic activity centers of carbon materials is the basis and key to the study of catalytic reaction kinetics and mechanism The results of molecular adsorption heat and in-situ XPS showed that the oxygen species with high nucleophilic on the surface of carbon materials contributed significantly to the oxidative dehydrogenation of alkanes The in-situ chemical titration method proposed by Qi Wei's research team is the first direct chemical evidence in the field to prove that ketone carbonyl group is the active center of the oxidative dehydrogenation of Alkanes Catalyzed by nano carbon At the same time, this method can directly quantify the number of active centers through a single test, and obtain the intrinsic catalytic activity (TOF) of carbon materials to a single active center, which lays the foundation for the study of reaction kinetics The mechanism of dehydrogenation of Alkanes Catalyzed by carbon was revealed by catalytic reaction kinetics, isotopic effect and in-situ FTIR characterization of carbon catalyst materials Different from the classical m-v-k mechanism on the surface of metal oxide materials, oxygen molecules have activation and oxygen exchange processes on the surface of carbon nanoparticles The kinetic parameters and reaction mechanism of vanadium oxide and nano carbon catalytic materials were compared systematically The advantages and disadvantages of carbon catalytic materials in the oxidative dehydrogenation of alkanes were summarized The guiding principles and directions for the design and preparation of carbon based catalytic materials with high catalytic activity and olefin selectivity were pointed out In the past five years, Qiwei research group has carried out systematic research work in the fields of qualitative and quantitative determination of catalytic activity center, intrinsic catalytic activity determination, and catalytic reaction kinetics, etc., and has published six series of papers (all influencing factors are greater than 10) This series of papers revealed the essential process of carbon catalysis through detailed and systematic research work, established a systematic theoretical system of non-metallic catalytic reaction, and effectively promoted the development of the field of green non-metallic nano carbon catalysis The research was supported by NSFC, Chinese Academy of Sciences, Institute of metals and Shenyang National (joint) Laboratory of materials science.