Oral Defense Examination : Development of superb catalytic perovskite hollow fiber membrane reactors for syngas / hydrogen production

Speaker Wang Zhigang (Supervisor: A/Prof Sibudjing Kawi)

Host Department of Chemical and Biomolecular Engineering

Date/Time 13 Feb - 13 Feb, 2.00PM

Venue E5-03-21 , Faculty of Engineering, National University of Singapore

Synopsis

Oxygen permeable perovskite membrane can permeate O2 by conducting oxygen ions at high temperature, which not only serves as an oxygen source for reactions but also enhances the reaction activity and selectivity. In this thesis, BaBi0.05Co0.95-xNbxO3-δ (x=0-0.2) perovskite materials were investigated by varying Nb doping ratio. Among all compositions, BaBi0.05Co0.8Nb0.15O3-δ showed the best performance. The perovskite ceramic hollow fiber membrane made by BaBi0.05Co0.8Nb0.15O3-δ (BBCN) was investigated and achieved ultra-high oxygen permeation flux. In addition, the oxygen permeability and stability under CH4 and steam atmosphere were also investigated. Subsequently, BBCN hollow fiber membrane was successfully integrated with novel La0.8Sr0.2Ni0.8Fe0.2O3-δ (LSNF) perovskite and Ni-phyllosilicate catalyst to form BBCN-LSNF and BBCN-Ni-phyllosilicate catalytic hollow fiber membrane reactors for oxidative steam reforming (OSR) and partial oxidation of methane (POM) reactions, respectively. Both novel catalytic membrane reactors demonstrate commendable catalytic-separation performance, achieving high productivity, selectivity and stability.

Biography