Efficient Production of Methyl Oleate Using a Biomass-Based Solid Polymeric Catalyst with High Acid Density

Figure 1

The CS and CS-SO₃H FT-IR spectra (a), XRD (b), SEM (c) and (d), water contact angle (e) and (f).

(a)

(b)

(c)

(d)

(e) CS 90.3°

(f) CS-SO₃H 32°