Novel Approach: Tungsten Oxide Nanoparticle as a Catalyst for Malonic Acid Ester Synthesis via Ozonolysis

Figure 2

The SEM images (a) 100.00 KX, (b) 50.00 KX, (c) 25.00 KX, and (d) 10.00 KX of WO₃, Nanoparticals.

(a)

(b)

(c)

(d)