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Recently, the research team of the Institute of Aerospace Catalysis and New Materials of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences has made new progress in the research of nano-gold catalysis. Based on the well-known reaction mechanism and material properties, it has been rationally designed and developed to commercialize gamma iron oxide. (γ-Fe2O3) supported Au/γ-Fe2O3 catalyst. This catalyst exhibits super-high activity for CO oxidation reaction, which is about 20 times that of Au/α-Fe2O3 catalyst. It shows a clear effect of the carrier crystal phase. One of the most active catalysts is currently reported. Further research shows that the crystal phase effect of the carrier can be extended to other precious metals such as Pt, Rh, etc. Meanwhile, it can also be extended to other reactions following the Redox process, providing new ideas for the design and development of catalysts. This result has been published in ACS catalysis.
The supported gold catalysts have uniquely high activity and/or high selectivity for many important reactions. In-depth studies of the factors affecting the supported gold catalysts can not only help improve the catalyst formulation and thus improve the catalyst performance, but the knowledge gained may be for other loads. The preparation and improvement of the performance of the noble metal catalyst have reference and guidance.
The previous study of the research group (Journal of catalysis, 2013, 299, 90-100) found that iron oxide-supported gold catalysts mainly follow the gold-induced redox mechanism (Redox): iron oxides with high redox properties The gold catalyst has a higher catalytic activity. In light of this, the research group recently developed a γ-Fe2O3-supported gold catalyst. The results show that the activity of Au/γ-Fe2O3 is about 20 times higher than that of Au/α-Fe2O3. It is one of the catalysts with the highest activity reported so far. It shows an obvious carrier phase effect (compared with α-Fe2O3 and γ-Fe2O3). With the same reversed spinel structure as Fe 3 O 4 , the reduction from γ-Fe 2 O 3 to Fe 3 O 4 involves only the loss of oxygen atoms (O) and does not involve lattice rearrangements, so the Au/α-Fe 2 O 3 catalyst is Gold-induced low-temperature reduction from γ-Fe2O3 to Fe3O4 was achieved.
Related research has been funded by the National Natural Science Foundation of China.
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