PhD Oral Qualifying Examination : Transformation of nonporous amorphous coordination polymers into crystalline materials for CO2 conversion

Speaker Yeo Jun Wen (Supervisor: Prof Zeng Hua Chun)

Host Department of Chemical and Biomolecular Engineering

Date/Time 13 Jul - 13 Jul, 10.00am

Venue E5-03-20 , Faculty of Engineering, National University of Singapore

Synopsis

Similar to metal-organic frameworks (MOFs), nonporous amorphous coordination polymers (CPs) consist of metal nodes bridged by organic ligands. In contrast to MOFs which are crystalline and often microporous, CPs are amorphous and dense in nature. As a result, CPs have received significantly less attention while MOFs have been hotly researched in the past decade. However, CPs offer some unique advantages such as ease of synthesis and the ability to incorporate a large number of metal ions without considering lattice mismatch effects, unlike in MOFs.  Further, due to their similarity in bonding, post synthetic modification methods that work on MOFs such as Solvent Assisted Ligand Exchange (SALE) should have a similar effect on CPs, enabling their transformation into MOFs. This work utilizes spherical Lanthanum-Nickel based CPs as precursors to form perovskite oxides that are screened as catalysts for the dry reforming of methane(DRM). Effects of morphology and synthesis conditions on catalytic performance are investigated. Also, the chemical transformation of CP precursors into crystalline MOFs are explored.

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