Bimetallic MOF-Derived Synthesis of Cobalt-Cerium Oxide Supported Phosphotungstic Acid Composites for the Oleic Acid Esterification

Figure 3

SEM images for (a, b) HPW@CoCe-MOF, (c, d) HPW@CoCeO, and TEM images of (e, f) HPW@CoCeO.