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Dalian Institute of Chemicals developed methane dry-up anti-carbon nickel monoatomic catalyst
[ Instrument Network Instrument Development ] Recently, Qiao Botao, a researcher in the Catalysis and New Materials Research Laboratory of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Zhang Tao, an academician of the Chinese Academy of Sciences, made new progress in the study of single-atom catalysis and found hydroxyapatite in the methane drying reaction. The supported nickel (Ni) atomic catalyst not only has high activity, but also has intrinsic resistance to carbon deposition. The study reveals that the incomplete dissociation of CH4 on the monoatomic active site of Ni avoids the formation of C species and avoids the formation of carbon deposits from the source.
Carbon dioxide (CO2) and methane (CH4) are the two most important greenhouse gases in nature, and they are also two abundant carbon resources in large quantities. Methane carbon dioxide drying converts methane and carbon dioxide into syngas, which can be used for subsequent fine chemical synthesis and Fischer-Tropsch reactions. The Pt group metals exhibit higher activity in this reaction, but the high cost of the precious metal limits its practical application. Ni metal has comparable activity to noble metals and has good application prospects. However, Ni-based catalysts tend to accumulate carbon and cause catalyst deactivation. Therefore, the development of Ni-based catalysts against carbon deposition has become the most active and challenging research direction in this field. One.
The study found that both hydroxyapatite (HAP)-loaded monoatoms and nanocatalysts were rapidly inactivated during the reaction, but their deactivation mechanisms were completely different. The deactivation of the nanocatalyst is mainly due to the carbon deposition of the catalyst, while the carbon monoxide is formed on the monoatomic catalyst, and the deactivation is caused by the sintering of the single atom. Therefore, after the addition of cerium oxide to stabilize a single atom in a monoatomic catalyst, the stability of the catalyst is greatly improved. The combination of theoretical calculations shows that the CH4 dehydrogenation of CH4 on the monoatomic catalyst can directly combine with the CO dissociated O to form CH3O species, and then gradually dehydrogenate to CO. The entire process avoids the formation of carbon species and thus has intrinsic resistance to carbon deposits.
This study provides new ideas for the development of a new high-stability anti-coking methane dry catalyst. The relevant results were published in Nature-Communication. Relevant work has been awarded by the National Natural Science Foundation of China, the Strategic Science and Technology Special Project of the Chinese Academy of Sciences (B) “The Essence and Regulation of Energy Chemical Transformationâ€, 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 Plan. Funding for youth talent projects, etc.