. Author manuscript; available in PMC: 2012 Mar 11.

Published in final edited form as: J Chromatogr A. 2011 Jan 5;1218(10):1359–1366. doi: 10.1016/j.chroma.2010.12.114

Table 3.

Characteristics of different carbon loads on Al/SiO₂

CVD condition	%C (w/w)	Carbon^a (μmol/m²)	Hypothetical carbon thickness^b (monolayers)	S_BET^c (m²/g)	Pore volume^d (cm³/g)	Nominal BET pore diameter^d (nm)
SiO₂	n/a	n/a	n/a	211	0.79	15.0
2 μmolAl/SiO₂	n/a	n/a	n/a	^f-	-	-
700 °C 6h	8	30	1.1	183	0.64	14.0
700 °C 16h	32	125	4.8	115	0.33	11.3

8μmolAl/SiO₂	n/a	n/a	n/a	180	0.68	15.1
700 °C 6h	14	67	2.5	-	-	-
700 °C 8h	21	98	3.7	149	0.47	12.6
700 °C 11h	25	144	4.4	147	0.43	11.7

^{a, b}

See ref 14.

Surface area (S_BET)

Pore volume obtained from single total pore volume less than 217, 254, 222, 131, 386, 123 nm diameter at P/P_o of 0.991, 0.992, 0.991, 0.985, 0.995 and 0.984, respectively (from top to bottom)

Nominal pore diameter of an equivalent single cylinder, calculated by 4x (pore volume)/S_BET.

As 4 and 8 μmol Al/SiO₂ hardly affect the original pore structure of SiO₂, we did not obtain the data for 2 μmolAl/SiO₂.