Table 2.

Composition of RHA Derived from Calcination of Rice Husk at 600 °C for 12 h

SiO2	Al2O3	Fe2O3	CaO	MgO	K2O	Na2O	MnO	TiO2	P2O5
93.2	0.13	0.07	1.23	0.25	0.78	0.08	0.33	0.006	0.15

Note: Reprinted from Int J Greenhouse Gas Cont, 3(5), Jang HT, Park Y, Ko YS, Lee JY, Margandan B. Highly siliceous MCM-48 from rice husk ash for CO2 adsorption. 545–549, Copyright 2009, with permission from Elsevier.⁵⁷