Research progress on interfacial confinement effect of heterogeneous catalysis at Dalian Chemical Institute

Synergistic Mechanism of CO Oxidation Catalyzed by Surface NiO and Subsurface Ni in PtNi Two-Component Catalytic System

Recently, the Research Group of Nano and Interface Catalysis of the State Key Laboratory of Catalysis Fundamentals, Dalian Institute of Chemical Physics, Chinese Academy of Sciences has made new progress in the study of interfacial confinement effects in heterogeneous catalysis.

In many catalytic processes, the catalytically active center is often a coordinated unsaturated metal atom. These species have metastable and variable characteristics, thus exhibiting a high degree of catalytic activity; on the other hand, maintaining this unsteady state Species need to provide a suitable chemical environment to moderately restrict them. Therefore, the variability of the catalytic active center and the invariance of the restricted environment are the basic characteristics of catalysis. Based on the catalytic confinement effect on the nanometer and interface scales, the research team creatively constructed a ferrous nanostructure with coordinated unsaturation on the surface of precious metal Pt, and successfully achieved the efficient activation of molecular oxygen at room temperature. The concept of "interface limited domain catalysis" (Science, 2010, 328, 1141-1144; Journal of Physical Chemistry C, 2010, 114, 17069-17079).

Recently, Mu Rentao, Fu Qiang, Bao Xinhe and others extended this concept to the PtNi catalytic system, and found the coordinated unsaturated Ni species at the boundary of the interface and their important role in low-temperature oxidation reactions; combining surface science experiments and The study of real catalysts further reveals the promotion effect of subsurface Ni on the surface catalytic reaction. The monolayer dispersed NiO nanostructures stabilized on the surface of Pt provide coordinated unsaturated Ni species at the interface to dissociate molecular oxygen, and the subsurface Ni species under the surface of Pt can reduce the activation energy of the elemental reaction between CO and atomic oxygen. Both show a mechanism of synergistic catalysis. The NiO / Pt / PtNi sandwich structure constructed according to this has high catalytic activity for CO oxidation.

Related results were published in the form of research papers in the latest issue of the Journal of the American Chemical Society (Journal of the American Chemical Society, 2011, 133, 1978-1986; DOI: 10.1021 / ja109483a).

Custom Design Indoor Playground Equipment

Custom Design Indoor Playground Equipment, Attractive Indoor Playland, Custom Playground Equipment

Liben Group Corporation , https://www.indoortrampoline.de