Structured Polyvinyl Alcohol/Zeolite/Carbon Composites Prepared Using Supercritical Fluid Extraction Techniques as Adsorbent for Bioethanol Dehydration

Table 1

Physicochemical properties for individual and composite adsorbents.

Characterization	Adsorbents
	PVA	Zeolite (Zeo)	Activated carbon (AC)	PVA/Zeo/AC 1 : 1 : 1	PVA/Zeo/AC 1 : 1 : 0.75	PVA/Zeo/AC 1 : 1 : 0.5	PVA/Zeo/AC 1 : 1 : 0.25	PVA/Zeo/AC 1 : 1 : 0
Surface area (m^2/g)	1.49	18.64	454.72	379.42	177.08	154.93	119.79	72.15
Pore volume (cm^3/g)	0.000434	0.019092	0.14	0.0841	0.071	0.0576	0.0621	0.0498
Pore size (nm)	2.0802	2.0903	2.0521	2.0521	1.8643	2.0206	1.9215	3.4433
Hydroxy number (mg KOH/g sample)	1,220.85	162.55	255.36	18.11	20.75	22.35	23.75	23.96
Iodine number (mg Iod/g sample)	1,281.17	1,281.45	2,209.67	1,331.16	1,298.49	1,296.51	1,286.36	1,232.98