Page 379 - Adsorbents fundamentals and applications

364 SORBENTS FOR APPLICATIONS

Table 10.21. Amounts of NO adsorbed (Q in mg/g) on various adsorbents at NO = 13 kPa
(or 12,830 ppm) and near room temperature, unless noted otherwise
Adsorbent Q, mg/g Reference and Notes

SnO 2 5 Solimosi and Kiss, 1976
CeO 2 5 Niwa et al., 1982
NiO 1 Yao and Shelef, 1978
Co 3 O 4 6 Yao and Shelef, 1978
CuO/g-Al 2 O 3 36 Yao and Shelef, 1978
NiO/g-Al 2 O 3 36 Yao and Shelef, 1978
Co 3 O 4 /g-Al 2 O 3 7 Yao and Shelef, 1978
45 Yao and Shelef, 1978
Fe 2 O 3 /g-Al 2 O 3
5 Segawa et al., 1982
Fe 2 O 3 /SiO 2
Fe-Y zeolite 18 Yuen et al., 1982
22 Lund et al., 1979
Fe 3 O 4
24 Otto and Shelef, 1970
Fe 3 O 4
9 Otto and Shelef, 1970
a-Fe 2 O 3
Jaosites 3–10 Inouye et al., 1982
a-FeOOH 10–20 Kaneko and Inouye, 1987
b-, g-FeOOH 4–6 Hattori et al., 1979
s-FeOOH 13 Kaneko and Inouye, 1988
Fe 2 O 3 /ACF 120–260 Kaneko, 1998
Styrenic polymer resins 119 Kikkinides and Yang, 1991; Yang 1993;
◦
0.1 atm each of NO, SO 2 and CO 2 ,at 26 C
Cu-MFI 19.9 Zhang et al., 1993; 997 ppm NO, 273 K
Co-MFI 26.3 Zhang et al., 1993; 997 ppm NO, 273 K
H 3 PW 12 O 40 · 6H 2 0 76 Yang and Chen, 1994 and 1995 1000 ppm NO,
◦
(Heteropoly compounds) with H 2 O/SO 2 /O 2 , 50–200 C
Fe-Mn oxides 16 Huang and Yang, 2001 200 ppm NO, 10% O 2 ,
◦
25 C
Fe-Mn-Ti oxides 45 Huang and Yang, 2001 200 ppm NO, 10% O 2 ,
◦
25 C
Fe-Mn-Zr oxides 44 Huang and Yang, 2001 200 ppm NO, 10% O 2 ,
◦
25 C
Cu-Mn oxides 1 wt % Ru >2 Yamashita et al., 2002 10 ppm NO, 30% R.H.
doped air, 35 C
◦
Data before 1988 taken from Kaneko and Inouye, 1988.
based on the magnetic property of NO has been proposed by Kaneko. NO is
paramagnetic, and it can form dimmers, (NO) 2 , only at a very low temperature.
The dimerization of NO could be enhanced through magnetic interaction with
magnetic iron oxide, such that NO loses its supercritical nature even at ambient
temperature. Thus, by interaction with the dispersed iron oxide, NO is dimerized
and subsequently adsorbed in the micropores of ACF.
Adsorption of NO in the presence of O 2 on carbon is not listed in Table 10.21.
Mochida and co-workers (Mochida et al., 1994; 1997) reported catalytic oxidation
of NO to NO 2 on activated carbon fibers at ambient temperature. With water, the