Progress in Research on Enhanced Dehydrogenation of Ethane by Porous Single Crystal Twisted Surface of Fujian Institute
[ Instrument R&D of Instrument Network ] Porous single crystal has the dual advantages of long-range ordered lattice structure and disordered interconnected channel structure. The porous single crystal lattice structure is clear, the chemical composition is precise, the termination surface is clear, and a continuous highly twisted active surface and fine structure can be constructed, which is of great significance for studying the surface structure and catalytic mechanism in various types of actual catalytic reactions.
With the support of the National Key R&D Program Transformative Technology Special Project, the National Fund Major Research Program Key Project, the Chinese Academy of Sciences Clean Energy Joint Fund and the Chinese Academy of Sciences Strategic Leadership B and other projects, the Chinese Academy of Sciences Fujian Institute of Material Structures Key Nanostructure Design and Assembly Experiment Shi Xiekui's group has grown a 2 cm size mesoporous Nb4N5 and MoN single crystal with a three-dimensional interconnected channel structure through a lattice reconstruction strategy. It precisely controls the crystal plane orientation and constructs a clear unsaturated activity on the twisted surface. Sites include Nb-N1/5, Nb-N2/5 and Mo-N1/3, Mo-N1/6. The clear unsaturated metal nitrogen coordination active structure on the surface of the porous single crystal can promote its chemical adsorption of hydrogen in ethane molecules and activation of carbon-hydrogen bonds, and enhance the performance of non-oxidative dehydrogenation to ethylene; meanwhile, the mesoporous single The fine structure of the crystal surface and the role of adsorbed species are clear, avoiding the deep cracking of ethane and improving the resistance to carbon deposition. The macro-sized porous single crystal can effectively control the distorted surface and unsaturated coordination fine structure, and has important reference significance for the study of the surface structure and catalytic mechanism in actual catalytic reactions.
Related results were published in "Angew Chem Int Ed". The first author of the paper is associate researcher Lin Guoming.
The research group has long been engaged in the study of the interface structure and catalytic mechanism of porous single crystal surfaces, and has made a series of progress (Angew Chem Int Ed, 2020, 59, 8729; ACS Catal 2020, 10, 3505; Nat Commun, 2019, 10: 3168; Nat Commun, 2019, 10: 4727; Nat Commun, 2019, 10: 1173; Nat Commun, 2019, 10, 1550; Adv Mater, 2018, 180655; Sci Adv, 2018, 4: eaar5100; Mater Horiz, 2018, 5: 953; Nat Commun, 2017, 8: 2178; Nat Commun, 2017, 8: 14785).