3D Hollow Mg-Ca-Al Hydrotalcite-Like Compounds Doped with KF for Catalytic Transesterification

Figure 2

SEM images of (a) Mg-Ca-Al HTLCs MS, (b) calcined Mg-Ca-Al HTLCs MS (calcined at 773 K), (c) KF/Mg-Ca-Al HTLCs MS (HTLCs MS calcined at 773 K), and (d) Mg-Ca-Al HTLCs prepared without the addition of citric acid.