Oral Defense Examination : Synthesis, Characterization and Catalytic Applications of Noble Metal Single-Atom Catalysts Stabilized on Heteropoly Acids

Speaker Zhang Bin (Supervisor: Dr Yan Ning)

Host Department of Chemical and Biomolecular Engineering

Date/Time 15 Mar - 15 Mar, 2.00PM

Venue E3-06-05 , Faculty of Engineering, National University of Singapore

Synopsis

Noble metals are rare on the earth but important in catalysis. How to maximize the utilization of noble metal resources is a significant issue. In recent years, supported noble metal single-atom catalysts (SACs) with every metal atom working as the active center are attracting increasing research interest and have undergone fast development. In this thesis, we aim to build up a series of noble metal (Pt, Rh, Pd) SACs supported on well-defined, Keggin-type heteropoly acids via different methods. Atomically dispersed Pt SACs supported on different heteropoly acids modified activated carbon were developed with good catalytic performance for hydrogenation reactions, with the relationship between SAC stability and reaction mechanism being explored. In addition, self-assembly methods were employed to prepare Rh and Pd SACs with more precise locations, which are active for CO oxidation reaction and hydrogenation reactions, respectively. Finally, an aqueous Pd SAC system was built up based on a monolacunary heteropoly acid, which serves as an effective tool for directly examining the catalytic mechanisms of SACs.

The works in the thesis contribute to the development of high loading (> 0.5wt%) noble metal SACs and SACs with precise as well as uniform anchoring sites, demonstrating the huge potential and feasibility of gaining deep insights into the reaction mechanisms via convincing experiments.

Biography