Hydrogen Production by Supercritical Water Gasification of Biomass with Homogeneous and Heterogeneous Catalyst

Table 4

Experimental results for different homogeneous catalysts.

Catalyst	Gas yield (mmol/g feedstock)				CGE (%)	Gas composition (%)
	H2	CO	CH4	CO2		H2	CO	CH4	CO2
Noncatalytic	2.86	2.19	1.71	6.48	23.16	21.60	16.54	12.92	48.94
LiOH	5.23	1.30	1.34	2.72	11.96	49.39	12.28	12.65	25.68
Na2CO3	3.14	1.43	1.42	5.42	18.46	27.52	12.53	12.45	47.50
NaOH	3.51	0.78	1.63	4.82	16.13	32.68	7.26	15.18	44.88
K2CO3	5.64	1.08	2.55	5.09	19.44	39.28	7.52	17.76	35.45
KOH	7.00	0.92	2.98	4.22	18.12	46.30	6.08	19.71	27.91
Ca(OH)2	6.66	1.88	1.81	3.37	15.75	48.54	13.70	13.19	24.56
ZnCl2	5.22	1.06	2.13	7.72	24.33	32.36	6.57	13.21	47.86

Catalyst, 1 g; feedstock, 1 g peanut shell + 0.3 g CMC; water density, 0.071 g/cm³; reaction time, 20 min; pressure, 22~24.0 MPa.