Recently, Qiao Botao, a researcher at the Research Institute of Catalysis and New Materials, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Zhang Tao, a member of the Chinese Academy of Sciences, have made new progress in the study of single atom catalysis. The catalyst not only has high activity, but also has intrinsic anti-coking performance. Studies have revealed that CH4 incompletely dissociates at the active site of Ni single atoms, avoiding the formation of C species and the formation of carbon deposits from the source.
Carbon dioxide (CO2) and methane (CH4) are the two most important greenhouse gases in nature. They are also two cheap carbon resources that exist in large quantities. Methane carbon dioxide dry reforming converts methane and carbon dioxide into synthesis gas, which can be used in the subsequent fine chemical synthesis and Fischer-Tropsch reaction. Pt group metals all exhibit higher activity in this reaction, but the high cost of precious metals limits their practical application. Ni metal has the same activity as noble metal and has good application prospects, but Ni-based catalysts are prone to carbon deposition and lead to catalyst deactivation. Therefore, the development of Ni-based catalysts resistant to carbon deposition has become the most active and challenging research direction in this field. One.
The study found that both hydroxyapatite (HAP) -loaded single atoms and nanocatalysts were quickly deactivated during the reaction, but the deactivation mechanism was completely different. The deactivation of the nano-catalyst is mainly due to the carbon deposition of the catalyst, but there is no carbon deposition on the single-atom catalyst, and its deactivation originates from the sintering of the single atom. Therefore, after adding cerium oxide to stabilize the single atom in the single atom catalyst, the stability of the catalyst is greatly improved. The research combined with theoretical calculations shows that after dehydrogenating CH4 to CH3 species on a single-atom catalyst, it can directly combine with the dissociated O of CO2 to generate CH3O species, and then gradually dehydrogenate to CO. The entire process avoids the generation of carbon species and thus has intrinsic anti-coking properties.
This research provides new ideas for the development of a new type of highly stable anti-coking methane dry reforming catalyst, and the relevant results are published in Nature-Communication. Relevant work was supported by the National Natural Science Foundation of China, the Strategic Leading Science and Technology Project of the Chinese Academy of Sciences (B) "Essence and Regulation of Energy Chemical Conversion", the National Key R & D Program "Nano Science and Technology" Key Project, the Chinese Academy of Sciences Clean Energy Research Institute Cooperation Fund, and the Xingliao Program Funding for young talent projects.
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